Emerson ASCO 300 Group 1 Brochures and Data Sheets

Power Switching & Controls
for Business-Critical Continuity

ASCO Ser i es 300
Power Transfer Switches
for Power Outage Protection

24-hour protection no matter
when trouble strikes

Where would you be

without a constant flow of
electrical power? We often
take for granted that power
will always be around when
we need it. In reality, power
failures are very common.
And when the power goes
out, your business suffers.
Power failures are unpredict­able. They can occur at any
time and for any number of
reasons—a bolt of lightning,
a power surge, a blackout,
an accident or even equip­ment failure. They come
without warning and often
at the most inconvenient
times.
It’s for this reason that
many businesses and other
entities have invested in
emergency power backup
systems. Typically, the sys­tem consists of an engine

generator and an automatic
transfer switch (ATS) which
transfers the load from the
utility to the generator.
An ATS with built-in
control logic monitors your
normal power supply and
senses any interruptions.
When the utility power fails,
the ATS automatically starts
the engine and transfers the
load after the generator has
reached proper voltage and
frequency. This happens in
a matter of seconds after
the power failure occurs.
When the utility power has
been restored, the ATS will
automatically switch the load
back, and after a time delay,
it will shut down the engine.
With an Automatic Transfer
Switch, you are protected
24 hours a day, seven days a
week.

2

Typical Applications

Telecom

In the telecommunications
industry, providing a high level
of service and dependability is
crucial. Lost power means an
interruption in service for your
customers and lost business
for your company. For instance,
with cell sites scattered across a
wide geographical region and in
many remote areas, the chances
of an interruption in power are
increased, making Automatic
Transfer Switches a valuable
resource at each location. To
maintain dependable service,
each cell site must be monitored
24 hours a day. This can be
very difficult without some
type of remote monitoring and
testing capability. The
Transfer Switch, combined with
ASCO’s monitoring and control
management system, is a cost­effective, packaged solution
which can help meet both of
these challenging objectives
without a major investment
at each cell site. With ASCO’s
connectivity solutions you can
remotely monitor and control
numerous sites from around
the corner or around the world.

SerieS 300

Agriculture

Maintaining electrical power
is vital to an agriculture opera­tion. If the flow of power is
interrupted, your operation
could be at risk unless the
backup generator is quickly
activated. A prolonged power
outage can affect numerous
aspects of the operation, from
housing and feeding livestock
to processing and produc­ing the end product. With
an ASCO
Switch, power will automatical­ly be transferred over to your
backup generator, eliminating
the need to manually switch
from utility to generator. When
power is restored, the ASCO
SerieS 300 Transfer Switch will,
after an adjustable time delay
to allow for utility stabilization,
automatically switch the load
back to the utility service.

SerieS 300 Transfer

Commercial /Retail,
Light Industrial

The retail industry is very com­petitive. An electrical power
failure can have a dramatic
impact on a retailer’s bottom
line. If power is interrupted
during peak shopping times,
the effect could be extremely
damaging to present and
future business. A power inter­ruption will not only suspend
shopping, it can also create
safety problems, result in lost
transaction data, lost account
information and damage to
data collection equipment. In
addition, retailers who rely on
controlled climates to protect
valuable inventory could suffer
even greater losses, especially
if the power failure occurs at
a time when no one is avail­able to rectify the situation. To
avoid any of these power out­age problems, simply install a
backup generator with an ASCO

SerieS 300 Transfer Switch and

power outage concerns will be
a thing of the past.

Municipal

The ASCO SerieS 300 Transfer
Switch can be a critical com­ponent of a municipal gov­ernment’s emergency power
backup system. Residents of
townships, cities and counties
rely on police, fire, ambulance/
first aid and other critical
public sector services. An inter­ruption in power would affect
the ability of emergency ser­vices to effectively respond to
the needs of the community.
When time is a critical factor,
such as when responding to a
fire alarm or an emergency call,
an ASCO
Switch can be a lifesaver,
switching power to the backup
generator. While not all munic­ipal services are a matter of
life and death, they are always
expected to be there.

SerieS 300 Transfer

3

series 300 Power Transfer Switches

Maximum Reliability & Excellent Value

With a SerieS 300 Transfer Switch, you get a product backed by
ASCO Power Technologies, the industry leader responsible for virtually every
major technological advance in the Transfer Switch industry.

The ASCO
transfer critical loads in the event of a power outage. Each and every
standard component was designed
by ASCO engineers for this purpose.

The rugged construction and proven performance of the ASCO
SerieS 300 assure the user of many years of complete reliability.
The
placed on the switch when starting or restarting stalled motors and
switching high inrush loads.

ASCO’s
and maintain. All parts are accessible from the front so switch contacts can
be easily inspected.

SerieS 300 was designed for one purpose–to automatically

SerieS 300 is even designed to handle the extraordinary demands

SerieS 300 modular, compact design makes it easy to install, inspect

Features

The SerieS 300 is listed to UL 1008 standard for Transfer Switch

Equipment and CSA standard C22.2 for automatic transfer switches.
Meets NFPA 110 for Emergency and Standby Power Systems
and the National Electrical Code (NEC) Articles 700, 701 and 702.
30 through 3000 amps in a compact design.

Available to 600 VAC, single or three phase.

True double-throw operation: The single solenoid design is inherently
inter-locked and prevents contacts from stopping between sources
or from being in contact with both sources at the same time.

UL Listed Withstand & Close-On Ratings

Available Symmetrical Amperes RMS

Switch Ratings

Amps

30 100,000 480v/60Hz 10,000

70 - 200 200,000 480v/60Hz 22,000
230 100,000 480v/60Hz 22,000
260, 400 200,000 480v/60Hz 42,000
600 200,000
600 200,000
600 200,000
800,1000,1200
1600, 2000 200,000 600v/60Hz 85,000
2600, 3000 200,000

When Used

With Current

Limiting Fuses

200,000 600v/60Hz 65,000

Maximum

Voltage

600v/60Hz 42,000
480v/60Hz 50,000
240v/60Hz 65,000

600v/60Hz 100,000

When Used

With Specific

Circuit Breakers

Fig. 1: ASCO Power Transfer Switch rated

200 amperes shown in Type 3R enclosure

There’s no danger of the SerieS 300 ATS

transferring loads to a dead source because
the unique ASCO single-solenoid operator
derives power to operate from the source to
which the load is being transferred.

Easy-to-read flush-mounted control and

display

panel provides LED indicators
for switch position and source availability.
It also includes test and time-delay bypass
switches as standard features.
Standard engine exerciser for weekly
automatic testing of engine generator set
with or without load.

Adjustable time-delay feature prevents switch

from being activated due to momentary
utility power outages and generator dips.

Supplied with solid neutral termination.

Optional switched neutral pole available.

Accessory kits available.
Available for immediate delivery.
Now available for service entrance

applications. Contact ASCO for assistance.

Notes: 1. Current – limiting fuse should be Class J type through 400 amps:

2. Refer to publication 1128 for specific manufacturer ’s breakers

use Class L type above 400 - amp fuse rating

4

series 300 Power Transfer Switches

Designed to Fit Anywhere

The ASCO SerieS 300 product line represents the most compact
design of automatic power transfer switches in the industry. With
space in electrical closets being at a premium, the use of wall or
floor-mounted ASCO Power Transfer Switches assures designers
optimum utilization of space.

All transfer switches through 2000 amps are designed to be
completely front accessible. This permits the enclosures to be
installed flush to the wall and still allows installation of all power
cabling and connections from the front of the switch. Cable entrance
plates are also standard on the 1600 and 2000 amp units to install
optional side-mounted pull boxes for additional cable bending space.

Fig. 2: ASCO Power Transfer Switch
rated 200 amperes

Fig. 3: ASCO Power Transfer Switch
rated 400 amperes

Fig. 6: ASCO Power Transfer Switch

rated 2000 amperes shown in Type 3R enclosure

Fig. 4: ASCO Power Transfer Switch
rated 600 Amperes

Fig. 5: ASCO Power Transfer Switch
rated 1000 amperes

Fig. 7: ASCO Power Transfer Switch
rated 3000 amperes

5

series 300 Microprocessor Controller

The ASCO Microprocessor Controller is used with all sizes of Power Transfer Switches. It represents the most reliable
microprocessor controller in the industry and includes, as standard, all of the voltage, frequency, control, timing and
connectivity functions required for most emergency and standby power applications.

Voltage & Frequency Sensing

Adjustable three-phase, close-differential voltage sensing

on normal source.

Normal source pickup voltage is adjustable to 95% of

nominal; drop-out is adjustable from 70% to 90% of nominal.

Frequency sensing on emergency source. Pickup at 95% and

dropout at 85% of nominal.

Time Delays

Adjustable time delay to override momentary normal

source outages to delay all transfer switch and engine-
starting signals.

Fig. 8: ASCO SerieS 300

Microprocessor Controller

Transfer to emergency time delay

minutes for controlled timing of load transfer to emergency.
Re-transfer to normal time delay
Five-minute unloaded running time delay for emergency

engine generator cool down.

Four-second time delay to ignore momentary voltage and

frequency transients during initial genset loading.

––

Adjustable from 0 to 5

––

Adjustable to 30 minutes.

Fig. 9: Door-Mounted Control & Display Panel

Control and Display Panel

Easy-to-read flush-mounted control and display panel

provides LED indicators for switch position and source avail­ability. It also includes test and time-delay bypass switches.

Standard Selectable Features

Inphase monitor to transfer motor loads, without any

intentional off time, to prevent inrush currents from

exceeding normal starting levels.
Engine exerciser to automatically test backup generator

each week—Includes control switch for testing with or

without load.
Selective load disconnect, double-throw contact to operate

at an adjustable 0 to 20 second adjustable time delay prior

to transfer and reset 0 to 20 seconds after transfer.
60 Hz or 50 Hz selectable switch.
Three-phase/single-phase selectable switch.

Remote Control Features

Terminal provisions for connecting:

Remote test switch.
Remote contact for test or for peak shaving applications.

Circuit will be automatically bypassed if emergency

source fails.

Remote time-delay bypass switch.

6

series 300 Microprocessor Controller

Simple and Accurate

Adjustment of

Voltage, Frequency

and Time-Delay

Settings Without

Need for Meters

and Variable

Power Supplies

Dip Switches for Enabling
Built-In Control Functions

Customer Control

Interfaces

Battery to

Maintain Engine

Exerciser Clock

Settings

Re-transfer to

Normal Adjustable

Time Delay

Transfer to

Emergency Adjustable

Time Delay

Serial

Communication Port

Fig. 10: Microprocessor Controller

Performance Features

600 volt spacing per UL and CSA standards.
Interfacing relays are industrial grade, plug-in type with dust covers.
Meets or exceeds the requirements for Electromagnetic Compatibility (EMC).

ANSI C37.90A/IEEE472 Voltage

Surge Test

NEMA ICS-109.21 Impulse

Withstand Test

Digital circuitry isolated from

line voltages

IEC 801-2 Electrostatic

discharge (ESD) immunity

ENV50140 and IEC 803-1: Radiated

electromagnetic field immunity

IEC 801-4 Electrical fast transient

(EFT) immunity
ENV50142 Surge transient immunity
ENV50141: Conducted

radio-frequency field immunity
EN55011: Group 1, Class A conducted and

radiated emissions
Optically isolated RS-485 Serial Port
EN61000- 4-11 voltage dips and interruptions

immunity

7

series 300 ATS Optional Accessories

Accessory 11BG

A programmable engine exerciser that provides for weekly or bi-weekly
operation, includes one form C contact for source availability of normal
and one contact for availability of emergency (contact rating 2 amps @ 30
Vdc, 0.5 amp @ 125 Vac resistive). The programmable engine exerciser
incorporates a 7 day or 14 day time base with a digital readout display.
Includes “with or without” load control selection for exerciser period.

Accessory 14AA/14BA

Auxiliary contacts to indicate position of main contacts. Two (2) for normal
and two (2) for emergency position (one set is standard).

Accessory 44A

Strip Heater with thermostat for extremely cold areas to prevent
condensation and freezing of this condensation. External 120 volt power
source required.

Accessory 44G

Strip Heater with thermostat, wired to load terminals: 208-240,
360-380, 460-480, 550-600 volts. Contains wiring harnesses for
all transfer switch sizes.

Accessory 72A/72E

*See “Connectivity Products”, Page 18

Accessory 123

A protective window that includes a poly-carbonate frame and weather
gasket to provide secure access to the membrane interface for the type
1 enclosures. This lockable cover is an alternative to providing 3R secure
enclosures.

Fig. 11: Programmable Engine Exerciser

with Source Availability Contacts

(Accessory 11BG)

Fig. 12: Strip Heater Kit

(Accessory 44G)

Field Conversion Kits for series 300 Transfer Switches

Kit No. Description

K629830 Engine Exerciser and source availability contacts (Acc. 11BG)
K613127-001 Strip Heater Kit (125 watt) 120 volt (Acc. 44A)

K613127-002 Strip Heater Kit (125 watt) 208-480 volt (Acc. 44G)

K609027 Cable Pull Box (1600-2000 amp)
K473872-001 6 FT Extension Harness
K755257-001 Serial Module with or without power manager (Acc. 72A)
K754603-001 Connectivity Module with or without power manager (Acc. 72E)
K778330-001 Window Kit (Acc. 123)

1. For 30-200 Amp switches only, not available for 300SE, or 300L

8

1

Fig. 13: Window Kit

(Accessory 123)

series 386 Non-Automatic Power Transfer Switches

User-Initiated Control

ASCO 386 non-automatic transfer switches are generally used in applications where operating personnel are available
and the load is not an emergency type requiring automatic transfer of power. The power-switching mechanism
and controller is the same hardware used on the highly reliable ASCO
furnished as standard with a momentary-type selector switch to initiate transfer and re-transfer. They can also be
arranged for remote control via ASCO’s connectivity products.

SerieS 300 transfer switches. ASCO 386s are

Electrical Features:

Listed under UL 1008, CSA certified:

- UL listed through 480 VAC.

- CSA certified through 600 VAC.
Door-mounted selector switch for local, manually initiated

electrical control.
Sizes from 30 through 3000 amps.
Available to 600 VAC, 50 or 60 Hz.
Rated for all classes of load transfer.
100% tungsten load ratings through 400 amps.
Designed for emergency and standby applications.
Same withstand and close-on rating as

SerieS 300.

Standard Selectable Control Features:

Inphase monitor to transfer motor loads between live sources,

without any intentional off time, to prevent inrush currents from

exceeding normal starting levels.
Selective load disconnect, double-throw contact to

operate at an adjustable 0 to 20 second time delay prior to trans-

fer and reset 0 to 20 seconds after transfer.
High/Low nominal voltage setting. Allows user to adjust for source

low reduced voltage conditions in remote areas.

60 Hz or 50 Hz selectable switch.
Single/Three-phase selectable switch.

Fig. 14: ASCO 386 400 Amp

Type 1 Enclosure w/Optional

Accessories 9C, 9D Source

Availability Lights

Fig. 15: Control and Display Panel

Control Features:

Switch position indicating signal lights.

One auxiliary contact closed when transfer switch is

connected to normal and one closed on emergency,

standard feature 14A/14B.

Optional Accessories:

6Q Key-operated, momentary source selector switch

furnished instead of the standard selector switch.

9C, 9D Source availability lights to provide operator with a local

indication of power source availability.

Accessory 14AA/14BA auxiliary contacts to indicate

position of main contacts. Two (2) for normal position and two

(2) for emergency position (one set is standard).

72A Serial module (5110) is used to allow local or remote

communications with ASCO POWERQUEST

products.

Special Enclosures

(Specify by appropriate code in catalog number):

Type 3R: Rain-tight

Type 4: Weatherproof

Type 12: Oil Tight
72E Connectivity Module 5150 is used to bring several
different serial devices that communicate at different
baud rates and with different protocols to a common
Ethernet media.

®

connectivity

9

series 300 & 386 Transfer Switch Ordering Information

To order an ASCO series 300 Power Transfer Switch, complete the following catalog number:

300

Product

300

B

+

Neutral

Code

Blank

Solid

Neutral

B

Switched

Neutral

3

+

Poles Amperes

2 poles,

1Ø

1

3 poles,

3Ø

600

+ +

Continuous

rating

30, 70, 104,

150, 200
230

4

, 260,

4

,

400, 600,

800, 1000,

1200, 1600,

2000

5

, 3000

5

2600

N

Voltage

Code

3

115

A

3

120

B

208

C

220

D

230

E

240

F

380

H

400

J

415

K

440

L

460

M

480

N

575

Q

600

R

+

Controller

1

1

X

+

Options

Insert “X”

If optional

accessories

are required

C

+

Enclosure

Blank Open Type

C

F
G
H
L

M

N

R

P

Type 1

(Standard)

Type 3R

Type 4

Type 4X

Type 12

Type 3R

Secure

Type 4
Secure

Type 4X6

Secure

Double

Door SS

Type 3RX

Secure

Double

Door SS

11CD

+

Optional

Accessories

Programmable

Engine Exerciser

14AA/14BA

2

Auxiliary Contacts

44A, 44G

2

Strip Heater w/

Thermostat

Serial Module

Connectivity

6,7

To order an ASCO series 386 Transfer Switch, complete the following catalog number:

386

Product

386

+

Neutral

Code

Solid

Neutral

B

Switched

Neutral

B

3

+

Phase

Poles

A

2 poles,

1Ø

1

3 poles,

3Ø

600

+ +

Amperes

Continuous

rating

30, 70, 100,

150, 200
230

4

, 260,

4

400, 600,

800, 1000,
1200, 1600,
2000, 2600,

3000

5

,

N

Voltage

Code

3

115

A

3

120

B

208

C

220

D

230

E

240

F

380

H

400

J

415

K

440

L

460

M

480

N

575

Q

600

R

+

Controller

1

1

X

+

Options

Insert “X”

If optional

accessories

are required

Notes: 1. Specify neutral code “C” for 260 and 400 amperes only.

2. Available 30-1000, and 1600 amps. Use Type 3R for 1200, 2000, 2600 and 3000 amp applications.

3. 115-120 volt available 30-400 amps only. For other voltages contact ASCO.

4. 200 and 230 amp rated switches for use with copper cable only.

5. Secure 3R type provided as standard for 2600-3000 amp when outdoor enclosure is required.

6. Type 304 Stainless Steel is standard. Suitable for indoor or outdoor use where there may be caustic or alkali
chemicals in use. To provide an improved reduction in corrosion of salt and some chemicals, optional type 316

Stainless Steel is recommended. This is a preferred choice for marine environments.

7. Available on switches rated 1200, 2000, 2600, and 3000 Amps.

C

+

Enclosure

Blank Open Type

Type 1

C

(Standard)

Type 3R

F

Type 4

G

Type 4X

H

Type 12

L

Type 3R

M

Secure

Type 4

N

Secure

Type 4X6

Secure

P

Double

Door SS

Type 3RX

Secure

R

Double

Door SS

+

2

2

6,7

9C/9D

Optional

Accessories

Key-Operated

Availability Lights

14AA/14BA

Auxiliary Contacts

Serial Module

All Accessories

Connectivity

Extended Warranties for series 300 Transfer Switches

Catalog No. Description

11BG

(2 sets)

72A

72E

Module

123

Window

Kit

6Q

Control

9C/9D

Source

72A

72E

Module

480 V

+

60 Hz

Specific

Volt & Freq

This information

is necessary
to allow correct
control settings

prior to shipment

480 V

+

60 Hz

Specific

Volt & Freq

This information

is necessary
to allow correct
control settings

prior to shipment

10

2EXW300 Two-Year Extended Warranty (Parts & Labor)

3EXW300 Three-Year Extended Warranty (Parts & Labor)

4EXW300 Four-Year Extended Warranty (Parts & Labor)

5EXW300 Five-Year Extended Warranty (Parts & Labor)

series 300 & 386 Transfer Switch Dimensions and Shipping Weights

Phase

Poles

2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
3
3
3
3

4

Neutral

Code

B3 or C

3

B

A
B
A
B
A

A

or C

A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B

UL Type 1 Enclosure

Switch Rating

Amps

30, 70, 100*, 104

150, 200

*SerieS 386 only

2303, 260, 400

600

800, 1000

1200

1600, 2000

2600, 3000

1

2

UL Type 3R, 4 or 12 Enclosure

Switch Rating

Amps

30, 70, 100*, 104

150, 200

*SerieS 386 only

2303, 260, 400

600

800, 1000

6

1200

1600, 2000

2600, 3000

2

Phase

Poles

Neutral

Code

2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
3
3
3
3

A
B
A
B
A

3

or C

B

A

3

or C

B

A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B

Dimensions, In. (mm)

Width

17 1/2 (445)
17 1/2 (445)
17 1/2 (445)
17 1/2 (445)

18 (457)
18 (457)
18 (457)
18 (457)
24 (610)
24 (610)
24 (610)
24 (610)
34 (864)
34 (864)
34 (864)
34 (864)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)

1,4,5,6

Height Depth

31 (787)
31 (787)
31 (787)

31 (787)
48 (1219)
48 (1219)
48 (1219)
48 (1219)
63 (1600)
63 (1600)
63 (1600)
63 (1600)
72 (1829)
72 (1829)
72 (1829)
72 (1829)
87 (2210)
87 (2210)
87 (2210)
87 (2210)
87 (2210)
87 (2210)
91 (2311)
91 (2311)

11 5/8 (295)
11 5/8 (295)
11 5/8 (295)
11 5/8 (295)

13 (330)
13 (330)
13 (330)
13 (330)
17 (432)
17 (432)
17 (432)
17 (432)
20 (508)
20 (508)
20 (508)
20 (508)
24 (610)
24 (610)
24 (610)
24 (610)
24 (610)

24 (610)
60 (1524)
60 (1524)

Dimensions, In. (mm)

Width Height Depth

17 1/2 (445)
17 1/2 (445)
17 1/2 (445)
17 1/2 (445)

18 (458)
18 (458)
18 (458)
18 (458)
24 (610)
24 (610)
24 (610)
24 (610)
34 (864)
34 (864)
34 (864)

34 (864)
41 (1043)
41 (1043)
41 (1043)
41 (1043)
41 (1043)
41 (1043)
41 (1043)
41 (1043)

35 (886)
35 (886)
35 (886)

35 (886)
50 1/2 (1284)
50 1/2 (1284)
50 1/2 (1284)
50 1/2 (1284)

63 (1602)
63 (1602)
63 (1602)
63 (1602)
75 (1907)
75 (1907)
75 (1907)

75 (1907)
94 1/2 (2403)
94 1/2 (2403)
94 1/2 (2403)
94 1/2 (2403)
95 1/2 (2428)
95 1/2 (2428)
95 1/3 (2424)
95 1/3 (2424)

11 5/8 (295)
11 5/8 (295)
11 5/8 (295)
11 5/8 (295)
14 1/3 (364)
14 1/3 (364)
14 1/3 (364)
14 1/3 (364)

18.50 (470)

18.50 (470)

18.50 (470)

18.50 (470)
20 (508)
20 (508)
20 (508)
20 (508)

33 1/2 (852)
33 1/2 (852)
33 1/2 (852)
33 1/2 (852)

62 (1577)
62 (1577)
74 (1882)
74 (1882)

Approx. Shipping

Weight Lb. (kg)

69 (32)

73 (33)
73 (33)

75 (34)
100 (45)
110 (50)
100 (45)
120 (55)

263 (119)
270 (122)
270 (122)
277 (126)
450 (204)
475 (217)
475 (217)
500 (228)
685 (312)
705 (321)
705 (321)
725 (328)
925 (419)

975 (441)
1700 (771)
2135 (969)

Approx. Shipping

Weight Lb. (kg)

84 (38)

87 (40)
87 (40)

90 (41)
132 (60)
140 (63)
140 (63)
148 (67)

664 (300)
672 (303)
672 (303)
680 (307)
664 (300)
672 (303)
672 (303)

680 (307)
1131 (513)
1160 (526)
1160 (526)
1189 (539)
1810 (817)
1860 (843)
2005 (905)
2070 (938)

Notes:

1. Unit is designed for top cable
entry of emergency & load and
bottom entry of normal. A cable
pull box is also available for all
top or bottom cable access when
required (optional accessory kit
#K609027). Not required for type
3R, 4X & 12 enclosures where
available.

2. Enclosures for 2600, 3000 amps
are free-standing with removable
top, sides & back.

3. Neutral Code “B” for 230 amperes

only.

4. Dimensional data is approximate

and subject to change. Certified
dimensions available upon
request.

Notes:

1. 30-1000 amps non-secure en­ closure. 1200-3000 amps secure
enclosure

2. When climate conditions at in­ stallation site present condensa­ tion risk, special precautions
should be taken, such as the
inclusion of space heaters, to
prevent interior condensation and
freezing of this condensation.

3. Neutral code “B” for 230 amperes
only.

4. Dimensions for switch sizes 30 ­ 1000 amperes suitable for Type
3R, 4, or 12 non secure enclosure,
1200 -3000 amperes only suit­ able for type 3R.

5. For 1200 ampere type 4, or 12
use 1600 amperes secure en­ closure dimensions.

6. Dimensional data is approximate
and subject to change. Certified
dimensions available upon
request.

series 300 & 386 External Power Connections

Sizes UL-Listed Solderless Screw-Type Terminals

Switch Rating

(Amps)

30 - 230

2

260, 400

600

800, 1000, 1200

1600, 2000
2600, 3000

Ranges of AL-CU Wire Sizes

(Unless Specified Copper Only)

One #14 to 4/0 AWG

Two 1/0 AWG to 250 MCM

or One #4 AWG to 600 MCM

Two 2/0 AWG to 600 MCM

Four 1/0 to 600 MCM

Six 1/0 to 600 MCM

Twelve 3/0 to 600 MCM

Notes:

1. All SerieS 300 switches are furnished with a solid neutral plate
(unless switched neutral configuration is specified) and terminal
lugs. Specify “A” in catalog number to order a neutral plate on the
series 386 switches.

2. 200 and 230 amp rated switches for use with copper cable only.
Refer to paragraph 310.15 of the NEC for additional information.

3. Use wire rated 75oC minimum for all power connections.

11

series 300SE Power Transfer Switch

The ASCO Service Entrance Power Transfer Switch combines
automatic power switching with the necessary disconnecting,
grounding, and bonding required for use as service entrance
equipment. The power transfer switch meets all National Electrical
Code requirements for service entrance use. Transfer switches
generally are installed at facilities that have a single utility feed and
a single emergency power source.

erieS 300SE products use two types of construction.

ASCO S

Products 400 amperes or less, utilize a single enclosure including
a service (utility source) disconnect circuit breaker, as well as the
power transfer switch, grounding and bonding provisions.

Products 600 amperes and above, utilize a multi-section
switchboard construction including a service equipment section
containing the service (utility source) disconnect circuit breaker,
grounding, and bonding provisions. A second section contains
the power transfer switch.

Product Features:

Suitable for use as service entrance equipment.

Listed to UL 891 (standard for switchboards) for
600 - 3000 amps, sizes and UL 1008 (standard for panel-boards)
for 70 - 400 amps.
Automatic Transfer Switch is listed to UL 1008 for total
system loads
Sizes available from 70 - 3000 amps, 600 VAC, 50 or 60 Hz,
single or three phase
Silver plated copper ground and neutral bus solderless
screw type terminals
Ground fault trip protection provided on sizes 1000 amps
and above
Available with solid or switched neutral

600 - 3000 Amp

Construction

70 - 400 Amp

Construction

Fig. 16: ASCO S

erieS 300

SE Rated 800 amperes Type

1 enclosure with Service

Entrance Equipment

Fig. 17: ASCO S

erieS 300 SE

rated 200 amperes in Type 1

enclosure with single source

breakers

series 300SE Transfer Switch Ordering Information

To order an ASCO series 300SE Power Transfer Switch, complete the following catalog number:

B

+ +

3AUS

Product

Neutral

Code

1

3AUS

B

Switched

Neutral

2 poles,

3 poles,

Notes: 1. Specify neutral code “C” for 250 and 400 amperes only.

2. Available 70-1000 ampacity. Use Type 3R for 1200-3000 amp applications.

3. 115-120 volt available 150-400 amps only.

4. A solid neutral is standard on 3AUS.

5. For switch sizes 70 - 225 amperes only.

12

+ +

Phase

Poles

1Ø

3Ø

4003 N

Amperes

Continuous

Rating

70, 100,

6

, 250,

2000

6

,

150, 200
225

400, 600,

800, 1000,

1200, 1600,

2500, 3000

Voltage

Code

3

115

A

3

120

B

208

C

220

D

230

E

240

F

380

H

400

J

415

K

440

L

460

M

480

N

575

Q

600

R

1

+

Controller

1

6. 200, 225 amp rated switch suitable for use with copper cable only.

7. Type 316 Stainless Steel is standard. It provides an improved reduction in corrosion
of salt and some chemicals. It is the preferred choice for marine environments.

8. Available only on switches rated 1200, 2000, 2600, and 3000 Amps.

X C +

+ +

Options

Blank Open Type

Insert “X”

If optional

accessories

are required

C

F
G
H
L

M

N

P

R

Enclosure

Type 1

(Standard)

Type 3R

Type 4

Type 4X

Type 12

Type 3R

Secure

Type 4
Secure

Type 4X

Secure
Double

Door SS

Type 3RX

Secure
Double

Door SS

Programmable Engine

2

2

6

73A Surge Suppres

7,8

11CD

Optional

Accessories

Exerciser

14AA/14BA

Auxiliary Contacts

(2 sets)

Strip Heater

w/Thermostat

Serial Module

72E Connectivity

Module

11BG

44G

72A

+

sor

240 V/60

Specific

Volt & Freq

This
information
is necessary

to allow

correct
control

settings prior

to shipment

series 300SE Transfer Switch Dimensions and Shipping Weights

UL Type 1 Enclosure

Switch Rating

Amps

70, 100 ,150,

200, 225

250, 400

1

1

, 800

600

10001, 1200

16001, 2000

25001, 3000

1

1

1

4

Phase

Poles

Neutral

Code

2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
3
3
3
3

STD

B

STD

B

STD

C

STD

C

STD

B

STD

B

STD

B

STD

B

STD

B

STD

B

Width

36.5 (927)

36.5 (927)

36.5 (927)

36.5 (927)

36.5 (927)

36.5 (927)

36.5 (927)

36.5 (927)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)

Dimensions, In. (mm)

Height

48.5 (1232)

48.5 (1232)

48.5 (1232)

48.5 (1232)

48.5 (1232)

48.5 (1232)

48.5 (1232)

48.5 (1232)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)
91 (2311)

Depth

13.25 (337)

13.25 (337)

13.25 (337)

13.25 (337)

13.25 (337)

13.25 (337)

13.25 (337)

13.25 (337)
28 (711)
28 (711)
28 (711)
28 (711)

48 (1218)
48 (1218)
48 (1218)
48 (1218)
48 (1218)
48 (1218)
72 (1829)
72 (1829)

Approx. Shipping

Weight Lb. (kg)

400 (185)
408 (188)
408 (188)
416 (192)
400 (185)
408 (188)
408 (188)
416 (192)
800 (370)
820 (378)
820 (378)

846 (390)
1085 (501)
1105 (510)
1105 (510)
1134 (523)

2590 (1198)
2640 (1218)
4590 (2118)
4655 (2148)

UL Type 3R Enclosure

Switch Rating

Amps

70, 100 ,150, 200, 225

must specify

250, 400

1

1

, 800

600

10001, 1200

16001, 2000

25001, 3000

1

1

1

4

Phase

Poles

2
2
3
3
2
2
3
3
2
2
3
3
2
2
3
3
3
3
3
3

Neutral

Code

STD

B

STD

B

STD

C

STD

C

STD

B

STD

B

STD

B

STD

B

STD

B

STD

B

Width

36(914)
36(914)
36(914)
36(914)
36(914)
36(914)
36(914)

36(914)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)
41(1041)

Notes: 1. Unit is designed for top and bottom cable entry for all services

2. Enclosures for 600 – 3000 amps are freestanding.

3. When temperatures below 32° F can be experienced, special pre-

and load.

cautions should be taken, such as the inclusion of strip heaters, to
prevent condensation and freezing of this condensation. This is

Dimensions, In. (mm)

Height

48(1219)
48(1219)
48(1219)
48(1219)
48(1219)
48(1219)
48(1219)
48(1219)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)

95.5(2426)
96(2438)
96(2438)

particularly important when environmental enclosures
(Type 3R, 4 & 12) are ordered for installation outdoors. See Optional
Accessories page for space heater options (acc. 44G).

4. Dimensional data is approximate and subject to change. Certified
dimensions available upon request.

Depth

16 (406)
16 (406)
16 (406)
16 (406)
16 (406)
16 (406)
16 (406)
16 (406)

34(864)
34(864)
34(864)

34(864)
62(1575)
62(1575)
62(1575)
62(1575)
62(1575)
62(1575)
85(2159)
85(2159)

Approx. Shipping

Weight Lb. (kg)

180 (83)
188 (87)
188 (87)

196 (90)
440 (203)
448 (207)
448 (207)
485 (225)
990 (458)

1010 (467)
1010 (467)
1036 (479)
1305 (604)
1325 (613)
1325 (613)

1354 (626)
2890 (1337)
2940 (1360)
5350 (2474)
5415 (2504)

Extended Warranties for

s

eries

300SE Transfer Switches

Catalog No. Description

2EXW300SE Two-Year Extended Warranty (Parts & Labor)
3EXW300SE Three-Year Extended Warranty (Parts & Labor)
4EXW300SE Four-Year Extended Warranty (Parts & Labor)
5EXW300SE Five-Year Extended Warranty (Parts & Labor)

s

eries

300SE AIC Rating

Switch Rating

70, 100, 150, 200, 225

250, 400

600

800, 1000,1200, 1600, 2000

2500, 3000

AIC Rating

25,000
35,000

50,000
65,000

100,000

Voltage

480
480
480
480
480

series 300SE External Power Connections

Sizes UL-Listed Solderless Screw-Type Terminals

Switch Rating

70, 100,

*

*

150, 200

800, 1000, 1200

Note: All SerieS 300SE switches are furnished with a solid neutral plate

* 200 and 225 amp rated switch for use with copper cable only.

, 225

250, 400

600

1600, 2000

2500
3000

(unless switched neutral configuration is specified) and terminal lugs.

Two 1/0 AWG to 250 MCM or One #4 AWG to 600 MCM

Ranges of AL-CU Wire Sizes

(Unless Specified Copper Only)

One #14 to 4/0 AWG

Two 1/0 AWG to 600 MCM

Four 1/0 to 600 MCM

Six 1/0 to 600 MCM
Twelve 3/0 to 600 MCM
Twelve 3/0 to 600 MCM

13

series 300L Power Transfer Load Center

• Conventional double throw
transfer switch conguration

• Automatic Transfer Switch is listed
to UL1008, the standard for Trans­ fer Switch Equipment, and meets
NFPA 110 for Emergency and
Standby Power Systems and
the National Electrical Code (NEC)
Articles 700, 701, and 702.
Also certied to CSA 22.2
No. 178

• Rated up to 240VAC, 200, or 400
amps

• Available in Type 1 indoor, or Type
3R secure aluminum
outdoor enclosure

• Reliable and eld proven single
solenoid operating mechanism

• Programmable microprocessor
controller with ush mounted
control and display panel

• LED indicators for switch
position and source availability

• Engine exerciser for weekly auto­ matic testing of engine generator
set with or without load

• Two auxiliary contacts, one con­ tact closed when switch is in
normal position and one contact
closed when switch is in emer­ gency position

• Suitable as service entrance
equipment, includes main circuit
breaker overcurrent protection on
the normal source, and circuit
breaker disconnect device on
emergency

• Includes a UL 67 Listed 42 position
Square - D panelboard load center

ASCO 300L Automatic Power Transfer Load Center shown with

optional quick connect Cam - Loc assembly and bottom Telco

cabinet section (in type 3R secure aluminum enclosure)

Short Circuit Ratings

200A Mains: 22kA at 240vac (Main circuit breaker (Normal &
Emergency) Square D circuit breakers rated 2/3 pole, 200A)

Note: If a generator input receptacle is supplied for a portable
generator then the ratings are as follows:

Normal Source – 22kA at 240 vac
(Utility Main Disconnect circuit breaker)

Emergency Source #2 (Permanent Generator
Input circuit breaker) – 10kA at 240vac

Emergency Source -#1 (Portable Generator
Input circuit breaker) – 5kA at 240vac

• Local/remote communications
capability for interfacing

with ASCO POWERQUEST®
communication products

14

400A Mains: 42kA at 240vac. (Main circuit breaker (Normal &
Emergency) Square D circuit breakers rated 2/3 pole, 400A)

Panelboard: Square D 225/400A series rated 42 circuit panelboard
single/three phase with 100% rated neutral, accepts bolt – on or
plug – in branch devices.

300L Power Transfer Switch Ordering Information

300

Product

300

1. Available on 300L, Power Transfer Load Center only. (two sets are standard) for 7000L SerieS.

2. Available for Type 3R enclosure only, rated 200 Amps. Not available for 400 Amp.

+

L4

Load

Center

4 = 42
Space

+

2 poles,

3 poles,

Poles

1Ø

3Ø

2002 F

+ +

Amperes

Continuous

Rating

200
400

C

F

Voltage

Code

208

240

+

Controller

5

1

Sizes UL-Listed Solderless Screw-Type Terminals

Switch Rating

(Amps)

200

400

Max # of Conductors

per Terminal

One
One
Two

Ranges of AL-CU Wire Sizes

(Unless Specified Copper Only)

# 4 AWG to 250 MCM
# 1 AWG to 600 MCM
# 1 AWG to 250 MCM

+

Options

Insert “X”
if optional

accessories

are required

X C

+

Enclosure

C

M

Type 1

(Standard)

Type 3R

Secure

(Outdoor)

73TL1

+

Optional

Accessories

11BG - Programmable

Engine Exerciser

14AA/14BA - Auxiliary

Contacts (2 Sets)

37P - Generator

Receptacle

44A - Strip Heater

w/Thermostat

72A -Serial Module

72E - Connectivity

73 - Surge Suppression

85L - Power Manager

117IB - Interlock Breaker

for Portable Generator

128TB - Telco Cabinet

130MG - Cam Loc

2

Module

(TVSS)

240V 60Hz

+

Voltage & Freq

1

2

Specific

This Information

is necessary

to allow correct

settings prior to

shipment

Dimensions for UL Type 1 and 3R Secured Enclosure

Switch Rating

Amps

Phase

Poles

Width

Enclosed UL Type1

200

400

2,3

2,3

30(762)

38(965)

Enclosed UL Type3R

Aluminum Secure

1

200

400

Note: 1. Add 20 inches to the height of the type 3R enclosure if accessory 128TB, Telco cabinet is required.

2,3

2,3

36(914)

38(965)

Extended Warranties for

s

eries

300L Power Transfer Center Switches

Catalog No. Description

2EXW300L Two-Year Extended Warranty (Par ts & Labor) Total 2 years

3EXW300L Three-Year Extended Warranty (Parts & Labor) Total 3 years
4EXW300L Four-Year Extended Warranty (Parts & Labor) Total 4 years
5EXW300L Five-Year Extended Warranty (Parts & Labor) Total 5 years

Note: 1. Consult ASCO for Type 3R secure enclosures

Dimensions, In. (mm)

Height

78(1981)

80(2032)

53(1346)

84(2134)

7-1/4(184)

11(279)

11-1/4(286)

Field Conversion Kits for

eries

300L Transfer Switches

S

Kit No. Description

K733433-001 Single Phase Surge Suppression 240v/120v (Acc. 73V*1)
K733433-003 Three Phase Surge Suppression 209v/120v (Acc. 73V*3)

Depth

6(152)

Approx. Shipping

Weight Lb. (kg)

250(115)

300(138)

305(141)

325(149)

15

16

17

PowerQuest

®

5700 Critical Power Management System

18

19

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