Watlow QPAC Specifications

QPAC

TOTAL

3 Year Warranty

CUSTOMER

SATISFACTION

Modular SCR Power
Controller for Custom
Tailoring to the Application

The QPAC SERIES from Watlow® is a modular Silicon
Controlled Rectifier (SCR) power controller with plug-in
features for flexibility. Bases are rated from 150 to 1000
amperes in one-phase, three-phase, two leg and three-phase,
three leg.

A variety of transformers from 120 to 575VAC along
with 50/60Hz operation enable the QPAC to operate in
applications anywhere. Plug-in control cards set the
QPAC’s SCR firing modes; solid state contactor, burst
firing (zero cross) or phase-angle models are available with
a wide variety of options. This power controller includes 200KA
short circuit current rating (SCCR) and high speed fuses to
minimize damage in the event of a short circuit.

Typical Applications

• Furnace and ovens

• Petrochemical

• Heat treating

• Duct heating

• Environmental chambers

• Kilns

Features and Benefits

200KA short circuit current rating (SCCR)

•

Minimizes damage in the event of a short circuit

Modular power controller

•

Unit base can be fitted with a variety of plug-in

transformers and control cards

Available in 150 to 1000 ampere ratings

•

Handles large or small loads

Available in solid state contactor, burst firing
(zero cross) or phase-angle fired mode

•

Meets most application requirements

Rugged design for 122°F (50°C) ambient operation

•

Full rating of the power controller can be used in

industrial applications

Semiconductor fuses and snubber protection included

•

Protects the SCR from voltage or current surges or spikes

Open heater or shorted SCR detector option

• Diagnostic capabilities

UL® 508 listed and C-UL® up to 1000 amperes

•

For applications requiring agency approvals

© 2013 Watlow Electric Manufacturing Company all rights reserved.

®

WIN-QPAC-0613

Specifications

Operation
Modular controller base with plug-in card and

transformer

• Plug-in control cards
Solid state contactor, dc input
Burst fire control, fixed or variable time base
Phase-angle fire control
Phase-angle control with soft start and current limiting

• Plug-in transformers (50/60Hz)

• 120, 208, 240, 380, 415, 480, 575VAC operation

Power bases

• 1-phase (Q01), 1 pair of SCRs

• 3-phase (Q32), 2 leg control, 2 pair SCRs
Resistive load only, burst firing only

• 3-phase (Q33), 3 pair hybrid SCRs/diodes
Recommended for phase-angle only with balanced load

Agency Approvals

• UL® 508 and C-UL® listed, 150 to 300A all configurations,
File #E73741

• UL® 508 and C-UL® listed, 400 to 1,000A on Q01 and Q32,
up to 480VAC

Control Card Inputs
(CD) Solid state contactor, dc input

• On, 4-32VDC; off, 0.5VDC

• Built-in noise reduction network

(BF) Burst firing control fixed time base

• Process input factory set @ 4-20mA DC

• Input impedance 250Ω (clip resistor for 5kΩ impedance
voltage input), or manual control input

• Time base 4 seconds (clip resistor for 1 sec)

(BV) Burst firing control, variable time base

• Process input factory set @ 4-20mA DC

• Input impedance 250Ω (clip resistor for 5kΩ impedance
voltage input), or manual control input. Requires an
accessory bias and gain card to calibrate for 0-5VDC input

(AF) Phase-angle control

• Process input factory set @ 4-20mA DC

• Input impedance 250Ω (clip resistor for 5kΩ impedance
voltage input), or manual control input

• Soft start approximately 6 seconds upon power-up,
1 second upon set point change

(AL) Phase-angle control with current limit

• Process input factory set @ 4-20mA DC

• Input impedance 250Ω (clip resistor for 5kΩ impedance
voltage input), or manual control input

• Soft start approximately 10 seconds upon power-up,
1 to 2 seconds upon set point change

• Current transformer included

Open Heater/Shorted SCR Detector

• Zero cross/burst fire models only

• Triac output

• 24 to 240VAC, 300mA @ 77°F (25°C), 125mA @
176°F (80°C)

• Energizes on alarm

• Holding current 200µA min.

• Latching current 5mA typical

Outputs

• 120 through 575VAC

• 1, 2 or 3 pole

• 150 to 1000A per pole

• SCCR, 200KA with original equipment specified
semiconductor fusing

Line Voltage / Power

• 50/60Hz ac line frequency, Q32 and Q33 models are
50/60Hz calibration dependent

• Voltage: ±10%, 120, 208, 240, 277, 380, 415, 480,
575VAC

Line Voltage Compensation

• 10% ∆ in line, 2% ∆ in load in the 30 to 70% power region
(AF, AL and BV)

Power Dissipation (Watts)

• 1.5 W/A per controlled leg

Isolation

• Command signal to load 1250VAC min.

Linearity

• 2%, 30 to 70% power region (All units except CD)

Off-State Leakage Current

• 20mA @ 480VAC

SCR Protection

• Semiconductor fuses provided dv/dt 200V/µsec min.

• MOV1 and RC snubber network standard

• (Q32) 3rd leg fuse kit may be used, but not required, with
3-phase, 2 leg models

Mounting

• Heat sink fins must be mounted in vertical orientation

Operating Environment

• 32 to 122°F (0 to 50°C)

• 0 to 90% RH, non-condensing

• 2,000 meters altitude

Storage Temperature

• -40 to 185°F (-40 to 85°C)

Options

• Manual Control Kit for process input cards
(1kΩ potentiometer) #08-5362

• 240VAC and 120VAC cooling fans

1

MOV comes only on Q33 (3-phase, 3 leg).

QPAC Weight Chart

Phase

Amps

150 15 (6.8) 36 (16.3) 50 (22.7)

200 15 (6.8) 36 (16.3) 50 (22.7)

300 15 (6.8) 36 (16.3) 50 (22.7)

400-600 44 (20.0) 85 (38.5) 100 (45.4)

800-1000 49 (22.2) 120 (54.4) 135 (61.2)

1Ø/Q01

lb (kg)

3Ø, 2-leg/Q32
lb (kg)

3Ø, 3-wire/Q33
lb (kg)

Case Styles

Depth

Width

Style C

Width

Style E

Height

Depth

Height

QPAC Dimensions

Q01

Height (H)

Style Amps

C 150 13 (330) 6.9 (175) 10.25 (260)

C 200 13 (330) 6.9 (175) 10.25 (260)

C 300 13 (330) 6.9 (175) 10.25 (260)

E 400-600 27 (685) 17 (430) 11.7 (300)

E 800-1K 27 (685) 17 (430) 13.3 (340)

Style Amps

C 150 13 (330) 13.7 (350) 10.25 (260)

C 200 13 (330) 13.7 (350) 10.25 (260)

C 300 13 (330) 13.7 (350) 10.25 (260)

E 400-600 27 (685) 21 (535) 11.7 (300)

E 800-1K 33 (840) 21 (535) 13.3 (340)

Style Amps

C 150 13 (330) 20.7 (525) 10.25 (260)

C 200 13 (330) 20.7 (525) 10.25 (260)

C 300 13 (330) 20.7 (525) 10.25 (260)

E 400-600 33 (840) 27 (685) 11.7 (300)

E 800-1K 33 (840) 27 (685) 13.3 (340)

in. (mm)

Q32

Height (H)
in. (mm)

Q33

Height (H)
in. (mm)

Width (W)
in. (mm)

Width (W)
in. (mm)

Width (W)
in. (mm)

Depth (D)
in. (mm)

Depth (D)
in. (mm)

Depth (D)
in. (mm)

Applications Sketch

In heat treating applications, the QPAC offers modular
flexibility. Different heater elements require different control
firing modes: i.e., tungsten elements need phase-angle firing,
while Nichrome

Shipping the furnace to different countries could require
different voltage sources (and thus transformers): i.e., U.S.
240 or 480 volt, Australia 415 volt; Europe 380 or 400 volt.
By simply changing plug-in transformers, the OEM can ship
anywhere in the world.

®

elements use burst (zero cross) firing.

Plug-in
Transformer

Plug-in
Control
Card

Power Base

Ordering Information

QPAC - Modular power controller; phase, burst or solid state contactor, fuse(s) and holder(s) included.

Part Number

Q

③ ④ ⑤

②①

Phase

- - -

Operating

& Output

Voltage

Cooling

Fan

Voltage

⑧ ⑨ ⑩ ⑫

⑦⑥

Output

Control

(Amps)

⑪

Input

Control

Card

Open Heater/

Shorted SCR

Detector

② ③ Phase

01 =

1-phase

32 = 3-phase, 2-leg (Optional 3rd leg fuse kit extra)

33 = 3-phase, 3-leg

④ ⑤ Operating and Output Voltage

12 =

120VAC

20= 208VAC

24 = 240VAC

27= 277VAC

38= 380VAC

41 = 415VAC

48 = 480VAC

57 = 575VAC

⑥ Cooling Fan Voltage

1 =

120VAC; required on all 3-phase models

2 =

240VAC; required on all 3-phase models

Notes:

• Customer to supply wiring and hook-up.

• All cooling fans rated at 20 W each, must be wired by customer.

⑦ ⑧ ⑨ Output Control (Amps)

150 =

150A

200 = 200A

300 = 300A

400 = 400A

500 = 500A

600 = 600A

800 = 800A

01k = 1000A

⑩ ⑪ Input Control Card

CD = Solid state dc input (08-5286) contactor 4-32VDC

BF = Burst fired, fixed time base (08-5289) 4-20mA dc

BV = Burst fired, variable time base (08-5342) 4-20mA dc

AF = Phase-angle fired, not available on Q32 (08-5288) 4-20mA dc

Phase-angle fired w/current limit (08-5411) 4-20mA, not

AL =

available on Q32. AL option includes one current
transformer. Add second CT for 3-phase, 3-leg

⑫ Open Heater/Shorted SCR Detector

0 =

None

1 = 1-phase operation

2 = 3-phase operation

Notes:

• The open heater/shorted SCR detector is for burst fire operation
only.

• Includes one current transformer for 1-phase and two current
transformers for 3-phase.

Wiring Example

Fuse

L1
L2

Fuse

Fuse

L3

Control Card

Command
Signal

L1 T1 L2

Fan Fan Fan

T2 L3 T3

Q33-481-150-BFO

Transformer

Fan Must Be Wired
to 120VAC

Accessories

Manual Control Kit 08-5362
150A : 5A Current Transformer 16-0008
200A : 5A Current Transformer 16-0045
300A : 5A Current Transformer 16-0073
400A : 5A Current Transformer 0004-0286-0400

®

Watlow® and DIN-A-MITE
Electric Manufacturing Company.

®

UL

and C-UL® are registered trademarks of the Underwriter’s

Laboratories, Inc.
Nichrome

®

is a registered trademark of Driver-Harris Company.

are registered trademarks of Watlow

500A : 5A Current Transformer 0004-0286-0500
600A : 5A Current Transformer 0004-0286-0600
800A : 5A Current Transformer 0004-0286-0800
1,000A : 5A Current Transformer 0004-0288-1000
5A : 20mA Interstage Transformer 16-0176

To be automatically connected to the nearest North American Technical Sales Office:

1-800-WATLOW2 • www.watlow.com • [e-mail]

International Technical Sales Offices: Australia, [phone] • China, [phone] • France, [phone]

Germany, +49 (0) 72 53 / 94 00-0 • India, [phone] • Italy, [phone] • Japan, [phone] • Korea, [phone]

Malaysia, [phone] • Mexico, [phone] • Singapore, [phone] • Spain, [phone]

Taiwan, [phone] • United Kingdom, [phone]