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UBW
Technical Manual
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WEG Electric UBW Technical Manual

Motors | Automation | Energy | Transmission & Distribution | Coatings
UBW Technical Manual
US.UBW.Tech.Manual.2018
Table of Contents
UBW Technical Manual
General Description .............................................................................................................................3
UBW 250 Trip Curves .........................................................................................................................33
UBW Dimensions
...............................................................................................................................49
2 Data subject to change without notice.
General Description
General Circuit Breaker Information
WEG’s molded-case circuit breakers are designed to provide circuit protection for low voltage distribution systems. They are described by NEMA as, “. . . a device for closing and interrupting a circuit between separable contacts under both normal and abnormal conditions,” and further- more as, “. . . a breaker assembled as an integral unit in a supporting and enclosing housing of insulating material.” The NEC® describes them as, “A device designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a predetermined overload of current, without injury to itself when properly applied within its rating.” So designed, WEG circuit breakers protect conductors against overloads and conductors and connected apparatus, such as motors and motor starters, against short circuits.
Circuit Breaker Components and Functions
Being essentially high interrupting capacity switches with repetitive elements, WEG’s circuit breakers are comprised of three main functional components. These are:
1. Trip elements (thermal-magnetic or electronic)
2. Operating mechanism
3. Arc extinguishers
1. Trip Elements
The function of the trip element is to trip the operating mechanism in the event of a prolonged overload or short-circuit current. To accomplish this, a thermal- magnetic trip action is provided.
Thermal-Magnetic Breakers
WEG thermal-magnetic breakers are general purpose devices suitable for the majority of breaker applications and are considered the industry standard. Available from 15–800 A, thermal-magnetic breakers provide accurate reliable overload and short- circuit protection for conductors and connected apparatus. Thermal trip action is achieved through the use of a bimetal heated by the load current. On a sustained over- load, the bimetal will deflect, causing the operating mechanism to trip.
Because bimetals are responsive to the heat emitted by the current flow, they allow a long­time delay on light overloads, yet they have a fast response on heavier overloads.
Magnetic trip action is achieved through the use of an electromagnet in series with the load current. This provides an instantaneous tripping action when the current reaches a predetermined value. Front-adjustable magnetic trip elements are supplied as standard on 250 A frame circuit breakers and above 225 are fixed thermal and magnetic
Electronic RMS Trip Breakers
WEG electronic trip breakers are generally applied for applications where high levels of system coordination are called for. Available from 500–2500 A, today’s electronic trip breakers can provide superior protection and coordination as well as additional protection features. Both the overload trip action and the short-circuit trip action of breakers with Digitrip electronic trip units are achieved by the use of current transformers and solid­state circuitry that monitors the current and initiates tripping through a flux shunt trip when an overload or a short circuit is present. All multiple-pole circuit breakers have trip elements in each pole and a common trip bar. An abnormal circuit condition in any one pole will cause all poles to open simultaneously.
Electronic RMS trip breakers can include trip features such as:
• Adjustable long-time pickup
• Adjustable short-time pickup
• Adjustable long delay time
• Adjustable short delay time
• Adjustable instantaneous pickup
Trip unit adjustments are made by setting switches on the front of the trip unit or by programming the trip unit electronically. All electronic RMS trip breakers are equipped with a manual push-to-trip mechanism.
Molded-Case Circuit Breakers
2. Operating Mechanism
The function of the operating mechanism is to provide a means of opening and closing the breaker contacts. All mechanisms are of the quick-make, quick-break type and are “trip free.” “Trip free” mechanisms are designed so that the contacts cannot be held closed against an abnormal circuit condition and are sometimes referred to as an “overcenter toggle mechanism.” In addition to indicating whether the breaker is “on” or “off,” the operating mechanism handle indicates when the breaker is “tripped” by moving to a position midway between the extremes. This distinct trip point is particularly advantageous where breakers are grouped, as in panelboard applications, because it clearly indicates the faulty circuit. The operating mechanism contains a positive on feature. In the normal switching operation, the handle of the circuit breaker will not be capable of being left readily at or near the off position when the main contacts are closed.
3. Arc Extinguishers
The function of the DE-ION® arc extinguisher is to confine, divide extinguish the arc drawn between opening breaker contacts. It consists of specially shaped steel grids isolated from each other and supported by an insulating housing. When the contacts are opened, the arc drawn induces a magnetic field in the grids, which in turn draws the arc from the contacts and into the grids. The arc is thus split into a series of smaller arcs and the heat generated is quickly dissipated through the metal. These two actions result in a rapid removal of ions from the arc, which hastens dielectric build- up between the contacts and results in rapid extinction of the arc.
Data subject to change without notice. UBW Technical Manual | 3
Molded-Case Circuit Breakers
Description UBW Breakers Frames 225 to 2500
Select trip
Operator type Types of operators: mechanically operated over-center toggle or motor operator
Closing speed Greater than 5-cycle closing for electrically operated devices
Mounting Typically fixed-mounted but large frame sizes may be available in drawout construction
Interrupting rating Interrupting duty at 480 Vac: 22–100 kA
Current limiting Current limiting available with and without fuses up to 200 kA
Relative cost Low
Available frame sizes Large number of frame sizes available. Typical 15–2500 A
Maintenance Very limited maintenance possible on larger frame sizes
Enclosure types Used in enclosures, panelboards, switchboards, MCCs and control panels
Series ratings Available in series ratings
Enclosed rating 80% continuous-current rated
Standards NEMA AB1/AB3 UL 489
Selective trip over a smaller range of fault currents within the interrupting rating (low short-time ratings). Typically 10–13 times the frame size
UBW Part Number Sequence
4 Data subject to change without notice.
Molded-Case Circuit Breakers
Interupting Capicity Ratings
225 Frame
Type Poles 240ac 480ac 600ac 250dc
N 3 65K 35K N/A 10K
H 3 100K 65K N/A 22K
L 3 200K 100K N/A 22K
250 Frame
Type Poles 240ac 480ac 600ac 250dc
N 3 65K 35K 18K 10K
H 3 100K 65K 25K 22K
L 3 200K 100K N/A 22K
400 Frame
Type Poles 240ac 480ac 600ac 250dc
N 3 65K 35K 18K 10K
H 3 100K 65K 35K 22K
L 3 200K 100K 65K 22K
600 Frame
Type Poles 240ac 480ac 600ac 250dc
N 3 65K 35K 25K 22K
H 3 100K 65K 35K 25K
L 3 200K 100K 50K 30K
800 Frame
Type Poles 240ac 480ac 600ac 250dc
S 3 65K 50K 25K 22K
H 3 100K 65K 35K 25
1200 Frame
Type Poles 240ac 480ac 600ac DC Rated
S 3 85K 50K 25K NO
H 3 100K 65K 35K NO
L 3 N/A 100K 65K NO
2500 Frame
Type Poles 240ac 480ac 600ac DC Rated
H 3 125K 65K 50K NO
L 3 200 100K 65K NO
Data subject to change without notice. UBW Technical Manual | 5
Molded-Case Circuit Breakers
UBW Time Current Curves 225N/H
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
5
15A
Minimum
8060 9070504030201 0 9 8 75 6
100
CURRENT IN AMPERES
300
200
Maximum single­pole trip times
1
at 25°C
Maximum
400
Circuit breaker time/current curves
F-frame circuit breakers
Catalog types ED, EHD, FDB, FD and HFD circuit breakers, two-, three- and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
Series 225 frame circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of rated wire (60˚C Tested in open air with current in all
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
15A See curve
Maximum Vdc: 250
Interrupting Rating (UL/CSA Listed)
Breaker
Symmetrical Rms amperes (KA) Amps (KA)
type
Breaker rating
Continuous amperes Instantaneous trip, amperes
15A See curve
Interrupting Rating (UL/CSA Listed)
Breaker Type
N
H
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vac 125V
18
EHD
18
FDB
65
FD
100
HFD
ED 65
1
Single-pole test data at 25˚C based on NEMA procedures (AB
4-2003
) for verifying performance of molded case
circuit breakers.
Symmetrical RMS amperes (kA) @240Vac @480Vac @600Vac 250Vac
65 35 18 10 100 65 25 22
pole.
—
14 14 35 65
—
10 14 18 25
—
—
10
—
10
—
22
10
—
5,000
3,000
2,000
1,000
500
300
200
100
50
2 HOURS
1 HOUR
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
600
900
700
500
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
20
10
5
3
2
1
.5
TIME IN SECONDS
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
56
3
TIME IN SECONDS
2
1
.5
.3
.2
.1
.05
Maximum interrupting time
Interrupting
rating
determines
end of curve
(see above)
60
40
20
987
10
30
80
7050
90
200
100
500
700
800
600
900
400
300
CURRENT IN AMPERES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
.03
.02
.01
.005
.003
.002
.001
6 Data subject to change without notice.
Molded-Case Circuit Breakers
UBW Time Current Curves 225 L
Effective September 2015
CURRENT IN AMPERES
CURRENT IN AMPERES
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
1 MINUTE
15A
8060 9070504030201 0 9 8 75 6
100
400
300
200
500
300
200
1000
800
600
900
700
500
Circuit breaker time/current curves
Series C® F-frame circuit breakers
Series C F-frame circuit breakers
Catalog type FDC circuit breaker, two-, three- and four-poles.
For application and coordination purposes only.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Based on 40˚C ambient, cold start. Connected with four (4) feet of rated wire (60˚C up to 125A, 75˚C above 125A) per terminal.
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Tested in open air with current in all poles.
terminal. Tested in open air.
Maximum Vac: 600 at 50/60 Hz
Maximum Vac: 600 at 50/60 Hz
Maximum Vdc: 250
Maximum Vdc: 250
Breaker rating
Continuous amperes Instantaneous trip amperes
Breaker rating
15A See curve
Continuous amperes Instantaneous trip, amperes
Interrupting rating (UL/CSA listed) Breaker
Symmetrical Rms amperes (KA) Amps (KA)
15A See curve
type
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
200FDC 100 35 22
Interrupting Rating (UL/CSA Listed)
1
Single-pole test data at 25˚C based on NEMA procedures (AB circuit breakers.
Breaker Type
L
Symmetrical RMS amperes (kA) Amps (KA)
4-2003) for verifying performance of molded case
@240Vac @480Vac @600Vac 250Vdc
200 100 35 22
2 HOURS
1 HOUR
5,000
3,000
2,000
1,000
500
300
200
Notes:
100
50
30
20
Maximum single­pole trip times
1
at 25°C
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
.02
100
1 MINUTE
50
30
20
600V
10
Minimum
5
3
2
1
Maximum
30,000
20,000
10,000
480V
80,000
60,000
70,000
50,000
40,000
.01
.005
240V
.003
.002
90,000
100,000
200,000
10
5
3
TIME IN SECOND S
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
.005
.003
.002
.001
.5
TIME IN SECOND S
.3
.2
.1
.05
.03
.02
.01
60
40
20
56
987
10
30
80
7050
90
200
100
500
700
800
600
400
300
900
2000
1000
5000
4000
3000
Maximum interrupting time
7000
8000
6000
9000
10000
Interrupting rating determines end of curve (see above)
Data subject to change without notice. UBW Technical Manual | 7
Molded-Case Circuit Breakers
Proof 1 — October 20, 2015 10:24 PM
UBW Time Current Curves 225N/H
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
20A
CURRENT IN AMPERES
8060 9070504030201 0 9 8 75 6
100
Maximum single­pole trip times at 25°C
1000
800
600
900
700
500
400
300
200
Circuit Breaker time/current curves
Series
For application and coordination purposes only. Based on 40°C ambient, cold start. Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per terminal. Tested in open air.
Maximum Vac: 600 at 50/60 Hz Maximum Vdc: 250
Breaker rating
Continuous amperes Instantaneous trip, amperes
20A See curve
Interrupting Rating (UL/CSA Listed)
Breaker Type
1
N
H
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
4000
3000
2000
Series C® F-frame circuit breakers
Catalog types ED, EHD, FDB, FD and HFD circuit breakers, two-, three-
2
25 circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of
Tested
Maximum Vac: 600 at 50/60 Hz Maximum Vdc: 250
Breaker rating
Continuous amperes Instantaneous trip amperes 20A See curve
Interrupting rating (UL/CSA listed)
Breaker
Symmetrical Rms amperes (KA) Amps (KA) @ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
type
18
EHD
18
FDB
65
FD
100
HFD ED
65 —
1
Single-pole test data at 25˚C based on NEMA procedures (AB
4-2003
circuit breakers.
10000
8000
6000
9000
7000
5000
time/current curves
5,000
3,000
2,000
1,000
500
125 Vdc
14
—
14
14
35
18
65
25
) for verifying performance of molded case
Symmetrical RMS amperes (kA) @240Vac @480Vac @600Vac 250Vac
65 35 18 10 100 65 25 22
—
—
10 10
—
300
—
10
—
22
10
—
200
100
50
30
20
2 HOURS
1 HOUR
10
5
3
2
1
.5
TIME IN SECONDS
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
Minimum
Maximum
Maximum interrupting time
Interrupting rating determines end of curve (see above)
10
5
3
TIME IN SECONDS
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
56
20
987
10
60
40
80
7050
30
90
200
100
500
700
800
600
900
400
300
CURRENT IN AMPERES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
.001
8 Data subject to change without notice.
UBW Time Current Curves 225 L
Series C
F-Frame
CURRENT IN AMPERES
10,000
CURRENT IN AMPERES
Proof 1 — October 20, 2015 10:24 PM
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
5
3
2
1
20A
Minimum
8060 9070504030201 0 9 8 75 6
100
Maximum single­pole trip times at 25°C
300
200
1
Maximum
Molded-Case Circuit Breakers
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
600
900
700
500
400
time/current curves
Series C F-frame circuit breakers
Catalog type FDC circuit breaker, two-, three- and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
Series C F-frame circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of rated wire (60˚C up to 125A, 75˚C above 125A) per terminal.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz Maximum Vdc: 250
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
20A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed) Breaker
Symmetrical Rms amperes (KA) Amps (KA)
Breaker rating
type
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
200FDC 100 35 22
Continuous amperes Instantaneous trip, amperes
1
Single-pole test data at 25˚C based on NEMA procedures
20A See curve
4-2003) for verifying performance of molded case
(AB circuit breakers.
Interrupting Rating (UL/CSA Listed)
Breaker Type
L
Symmetrical RMS amperes (kA) Amps (KA) @240Vac @480Vac @600Vac 250Vdc
200 100 35 22
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
.02
600V
480V
80,000
60,000
70,000
50,000
40,000
30,000
20,000
10,000
.01
.005
240V
.003
.002
90,000
100,000
200,000
2 HOURS
1 HOUR
5,000
3,000
2,000
1,000
500
300
200
100
1 MINUTE
50
30
20
10
5
3
TIME IN SECOND S
2
1
.005
.003
.002
.001
.5
TIME IN SECOND S
.3
.2
.1
.05
.03
.02
.01
60
40
20
56
987
10
30
80
7050
90
200
100
500
700
800
600
900
400
300
1000
2000
3000
4000
5000
Maximum interrupting time
7000
8000
6000
9000
10000
Interrupting rating determines end of curve (see above)
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
Data subject to change without notice. UBW Technical Manual | 9
Molded-Case Circuit Breakers
Time Current Curves 225 N., H.
30A
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
CURRENT IN AMPERES
8060 9070504030201 0 9 8 75 6
100
400
300
200
1000
800
600
900
700
500
2000
3000
4000
Circuit breaker time/current curves
Series C® F-frame circuit breakers
Catalog types ED, EHD, FDB, FD and HFD circuit breakers, two-, three- and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
225 circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of
Tested in open air with current in all poles.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker Rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
30A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed)
Symmetrical RMS amperes (KA) Amps (KA)
Breaker
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc 125 Vdc
type
18
EHD
18
FDB
65
FD
100
HFD
65 —
ED
1
Single-pole test data at 25˚C based on NEMA procedures
4-2003
) for verifying performance of molded case
(AB circuit breakers.
Maximum single­pole trip times
1
at 25°C
Breaker rating
Continuous amperes Instantaneous trip, amperes
30A See curve
Interrupting Rating (UL/CSA Listed)
Breaker Type
N
H
10000
8000
6000
9000
7000
5000
5,000
125A, 75˚C above 125A) per terminal.
14
—
14
35 65
Symmetrical RMS amperes (kA) @240Vac @480Vac @600Vac 250Vac
65 35 18 10 100 65 25 22
10
14
10
18
10
25
22 —
—
3,000
2,000
1,000
500
— — —
300 — 10
200
100
50
2 HOURS
1 HOUR
1 MINUTE
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
30
20
10
5
3
2
1
.5
TIME IN SECONDS
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
Minimum
Maximum
Maximum interrupting time
Interrupting rating determines end of curve (see above)
10
5
3
TIME IN SECONDS
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
56
20
987
10
60
40
80
30
7050
90
200
100
500
700
800
600
900
400
300
CURRENT IN AMPERES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
.001
10 Data subject to change without notice.
UBW Time Current Curves 225 L
Series C F-Frame
CURRENT IN AMPERES
10,000
CURRENT IN AMPERES
Proof 1 — October 20, 2015 10:24 PM
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
5
3
2
1
30A
Minimum
Molded-Case Circuit Breakers
8060 9070504030201 0 9 8 75 6
100
400
300
200
1000
800
600
900
700
500
4000
3000
2000
10000
8000
6000
9000
7000
5000
time/current curves
Series C F-frame circuit breakers
Catalog type FDC circuit breaker, two-, three- and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
Series C F-frame circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of rated wire (60˚C up to 125A, 75˚C above 125A) per terminal.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
30A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed) Breaker
Symmetrical Rms amperes (KA) Amps (KA )
Breaker rating
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
type
200FDC 100 35 22
Continuous amperes Instantaneous trip, amperes
1
Single-pole test data at 25˚C based on NEMA procedures
30A See curve
(AB
4-2003) for verifying performance of molded case
circuit breakers.
Maximum single­pole trip times
1
at 25°C
Interrupting Rating (UL/CSA Listed)
Breaker Type
L
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
Symmetrical RMS amperes (kA) Amps (KA) @240Vac @480Vac @600Vac 250Vdc
200 100 35 22
.02
600V
.01
.005
240V
.003
.002
90,000
100,000
200,000
Maximum
480V
80,000
60,000
70,000
50,000
40,000
30,000
20,000
10,000
2 HOURS
1 HOUR
5,000
3,000
2,000
1,000
500
300
200
100
1 MINUTE
50
30
20
10
5
3
TIME IN SECOND S
2
1
.005
.003
.002
.001
.5
TIME IN SECOND S
.3
.2
.1
.05
.03
.02
.01
60
40
20
56
987
10
30
80
7050
90
200
100
500
700
800
600
900
400
300
1000
4000
3000
2000
Maximum interrupting time
7000
8000
6000
9000
5000
10000
Interrupting rating determines end of curve (see above)
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
Data subject to change without notice. UBW Technical Manual | 11
Molded-Case Circuit Breakers
Time Current Curves 225 N/H
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
5
40A
8060 9070504030201 0 9 8 75 6
100
CURRENT IN AMPERES
600
500
400
300
200
Maximum single­pole trip times
1
at 25°C
Minimum Maximum
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
900
700
Circuit breaker time/current curves
Catalog types ED, EHD, FDB, FD and HFD circuit breakers, two-, three - and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
Series C F-frame circuit breakers
Based on 40˚C ambient, cold start. Connected with four (4) feet of rated wire (60˚C up to 125A, 75˚C above 125A) per terminal.
Catalog Types: ED, HED FDB, FD and HFD circuit breakers, two-, three- and four-pole.
Tested in open air with current in all poles.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker Rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
40A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed)
Symmetrical Rms amperes (KA) Amps (KA)
Breaker
Breaker rating
Continuous amperes Instantaneous trip, amperes
40A See curve
Interrupting Rating (UL/CSA Listed)
Breaker Type
N H
@ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc 125 Vdc
type
18
EHD FDB FD HFD ED
1
Single-pole test data at 25˚C based on NEMA procedures
4-2003
(AB circuit breakers.
14
18
14
65
35
100
65
—
) for verifying performance of molded case
Symmetrical RMS amperes (kA) @240Vac @480Vac @600Vac 250Vac
65 35 18 10 100 65 25 22
10
—
14
10
18
10
25
22
—
—
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
5,000
3,000
2,000
1,000
500
— —
300
— —
0156
200
100
50
30
20
10
5
2 HOURS
1 HOUR
1 MINUTE
3
2
1
.5
TIME IN SECONDS
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
56
3
TIME IN SECONDS
2
1
.5
.3
.2
.1
.05
Maximum interrupting time
Interrupting rating determines end of curve (see above)
60
40
20
987
10
30
80
7050
90
200
100
500
700
800
600
900
400
300
CURRENT IN AMPERES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
.03
.02
.01
.005
.003
.002
.001
12 Data subject to change without notice.
Molded-Case Circuit Breakers
UBW Time Current Curves 225 L
CURRENT IN AMPERES
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
1 MINUTE
40A
100
8060 9070504030201 0 9 8 75 6
500
300
200
100
50
30
20
CURRENT IN AMPERES
600
500
400
300
200
Maximum single­pole trip times
1
at 25°C
700
time/current curves
Series C F-frame circuit breakers
Catalog type FDC circuit breaker, two-, three- and four-poles.
Circuit breaker time/current curves
225 circuit breaker
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
40A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed)
Breaker
Breaker rating
type
Continuous amperes Instantaneous trip, amperes
1
Single-pole test data at 25˚C based on NEMA procedures
40A See curve
(AB
4-2003) for verifying performance of molded case
circuit breakers.
Interrupting Rating (UL/CSA Listed)
Breaker Type
L
cold start. Connected with four (4) feet of
75˚C above 125A) per terminal.
Symmetrical Rms amperes (KA) Amps (KA) @ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
200FDC 100 35 22
Symmetrical RMS amperes (kA) Amps (KA) @240Vac @480Vac @600Vac 250Vdc
200 100 35 22
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
.02
5,000
3,000
2,000
1,000
500
300
200
100
50
30
20
2 HOURS
1 HOUR
1 MINUTE
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
900
600V
10
Minimum Maximum
5
480V
240V
.01
.005
10
5
.005
.003
.002
.001
3
2
80,000
60,000
70,000
50,000
40,000
30,000
20,000
10,000
1
.5
TIME IN SECO NDS
.3
.2
.1
.05
.03
.02
.01
60
40
20
56
987
10
30
80
7050
90
200
100
500
700
800
600
400
300
900
1000
3000
2000
7000
8000
6000
5000
4000
.003
.002
90,000
100,000
200,000
Maximum interrupting time
Interrupting rating determines end of curve (see above)
9000
10000
3
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
TIME IN SECO NDS
Data subject to change without notice. UBW Technical Manual | 13
Molded-Case Circuit Breakers
Time Current Curves
225 N., H.
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
5
50A
Minimum
CURRENT IN AMPERES
8060 9070504030201 0 9 8 75 6
100
200
400
300
Maximum single­pole trip times at 25°C
1000
800
600
900
700
500
1
4000
3000
2000
Catalog types ED, EHD, FDB, FD and HFD circuit breakers, two-, three- and four-poles.
Circuit breaker time/current curves
225 Circuit breaker
Based on 40˚C ambient, cold start. Connected with four (4) feet of
Tested in open air with current in all poles.
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vac: 600 at 50/60 Hz
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per
Maximum Vdc: 250
terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes
Maximum Vac: 600 at 50/60 Hz
50A See curve
Maximum Vdc: 250
Interrupting rating (UL/CSA listed)
Symmetrical Rms amperes (KA) Amps (KA)Breaker
Breaker rating
type @ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc 125 Vdc
18
EHD
Continuous amperes Instantaneous trip, amperes
18
FDB
65
FD
50A See curve
100
HFD ED
65
1
Single-pole test data at 25˚C based on NEMA procedures
Interrupting Rating (UL/CSA Listed)
4-2003
(AB circuit breakers.
Breaker Type
FD
H
10000
8000
6000
9000
7000
5000
time/current curves
circuit breakers
14
--
10
14
14
35
18
65
25
—
) for verifying performance of molded case
—
Symmetrical RMS amperes (kA) @240Vac @480Vac @600Vac 250Vac
65 35 18 10 100 65 25 22
—
10
— —
10
—
22
10
—
5,000
3,000
2,000
1,000
500
300
200
100
50
2 HOURS
1 HOUR
1 MINUTE
Notes:
Maximum
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
20
10
5
3
2
1
.5
TIME IN SECONDS
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
56
3
TIME IN SECONDS
2
1
.5
.3
.2
.1
.05
Maximum interrupting time
Interrupting rating determines end of curve (see above)
60
40
20
987
10
30
80
7050
90
200
100
500
700
800
600
900
400
300
CURRENT IN AMPERES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
.03
.02
.01
.005
.003
.002
.001
14 Data subject to change without notice.
UBW Time Current Curves 225L
Series C
F-Frame
CURRENT IN AMPERES
Proof 1 — October 20, 2015 10:24 PM
10,000
2 HOURS
5,000
1 HOUR
3,000
2,000
1,000
500
300
200
100
50
1 MINUTE
30
20
10
50A
Minimum
8060 9070504030201 0 9 8 75 6
100
CURRENT IN AMPERES
600
500
400
300
200
Maximum single­pole trip times at 25°C
Maximum
3000
2000
1000
800
900
700
Circuit breaker time/current curves
Catalog type FDC circuit breaker, two-, three- and four-poles.
Circuit breaker time/current curves
For application and coordination purposes only.
225 circuit breakers
rated wire (60˚C up to 125A, 75˚C above 125A) per terminal.
Maximum Vac: 600 at 50/60 Hz
For application and coordination purposes only. Based on 40°C ambient, cold start.
Maximum Vdc: 250
Connected with four (4) feet of rated wire (60°C up to 125A, 75°C above 125A) per terminal. Tested in open air.
Breaker rating
Continuous amperes Instantaneous trip amperes 50A See curve
Maximum Vac: 600 at 50/60 Hz Maximum Vdc: 250
Interrupting rating (UL/CSA listed) Breaker type
Breaker rating
Continuous amperes Instantaneous trip, amperes
1
Single-pole test data at 25˚C based on NEMA procedures
4-2003) for verifying performance of molded case
(AB
50A See curve
circuit breakers.
Interrupting Rating (UL/CSA Listed)
1
Breaker Type
L
Notes:
1 Single-pole test data at 25°C based on NEMA procedures (AB 4-2003) for verifying
performance of molded case circuit breakers.
Molded-Case Circuit Breakers
10000
8000
6000
9000
7000
5000
4000
circuit breakers
cold start. Connected with four (4) feet of
Symmetrical Rms amperes (KA) Amps (KA) @ 240 Vac @ 480 Vac @ 600 Vac 250 Vdc
200FDC 100 35 22
Symmetrical RMS amperes (kA) Amps (KA) @240Vac @480Vac @600Vac 250Vdc
200 100 35 22
.02
600V
.01
480V
2 HOURS
1 HOUR
5,000
3,000
2,000
1,000
500
300
200
100
1 MINUTE
50
30
20
10
.005
.003
.002
5
3
2
80,000
60,000
70,000
50,000
40,000
30,000
20,000
10,000
1
.5
TIME IN SECOND S
.3
.2
.1
.05
.03
.02
.01
.005
240V
.003
.002
90,000
100,000
200,000
Maximum interrupting time
Interrupting rating determines end of curve (see above)
5
3
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
TIME IN SECOND S
2
.001
56
987
10
30
80
7050
90
200
100
500
700
800
600
400
300
900
1000
3000
2000
7000
8000
6000
9000
5000
4000
10000
60
40
20
.001
Data subject to change without notice. UBW Technical Manual | 15
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