Drawing
25
Time Current Curves TC01200002E
Effective March 2018
Series C
F-Frame
EATON www.eaton.com
Interrupting
rating
determines
end of curve
Minimum
Maximum
100
50
30
20
10
5
3
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
TIME IN SECONDS
1,000
500
300
200
5,000
3,000
2,000
1 HOUR
1 MINUTE
2 HOURS
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
600
900
700
500
400
300
200
100
80
60
90
7050
40
30
20
10
987
5 6
TIME IN SECONDS
10,000
100
50
30
20
10
5
3
2
1
.5
.3
.2
.1
.05
.03
.02
.01
.005
.003
.002
.001
1,000
500
300
200
5,000
3,000
2,000
1 HOUR
1 MINUTE
2 HOURS
CURRENT IN AMPERES
10000
8000
6000
9000
7000
5000
4000
3000
2000
1000
800
600
900
700
500
400
300
200
100
8060 907050403020109875 6
80A
Maximum single-
pole trip times
at 25°C
1
CURRENT IN AMPERES
Maximum
interrupting
time
Circuit breaker time/current curves
Series C
®
F-frame circuit breakers
Catalog types EHD, FD and HFD circuit breakers, single-pole.
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 100A, 75˚C above 125A) per terminal.
Tested in open air.
Maximum Vac: 277 at 50/60 Hz
Maximum Vdc: 125
Breaker rating
Continuous
amperes Instantaneous trip, amperes
80A See curve
Single-pole test data at 25˚C based on NEMA procedures
(AB
4-2003) for verifying performance of molded case
circuit breakers.
Breaker
type
Symmetrical Rms amperes (kA )
14
35
65
EHD
FD
HFD
10
10
10
277V
DC amps
125V
Interrupting rating (UL/CSA listed)
Figure 22. Single Pole, Series C, Types EHD, FD, and HFD 80A—Curve Number SC-4433-88A
Circuit breaker time/current curves
Series C F-frame circuit breakers
Catalog Types: EHD, FD and HFD circuit breakers, single-pole.
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 100A, 75°C above 125A) per
terminal. Tested in open air.
Maximum Vac: 277 at 50/60 Hz
Maximum Vdc: 125
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) DC Amps
EHD
FD
HFD
277V 125V
Breaker Type
Interrupting Rating (UL/CSA Listed)
80A See curve
Breaker rating
Continuous amperes Instantaneous trip, amperes
14 10
35 10
65 10