Drawing
6
Time Current Curves TC01200002E
Effective March 2018
Series C
F-Frame
EATON www.eaton.com
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1
Available long delay time:
2,4,7,10,12,15,20,24
Shown @ 6x
2,4,7,15,24 seconds
+0 / –30%
I
r
Available short delay
pick up settings
2–8,10, x 5%
12
I
r
(See Note 7)
FDE
Circuit breaker time/current curves (phase current)
:
I
Available sensors( )
n
80A
160A
225A
1
2 3 4
5
7
10
20 30 40 50 70 100
2 3 4
5
7
10
20
30
40
50
70
100
.5
.7
1
2 3 4
5
7
10
20 30
.5
.7
Types FDE, FDCE, HFDE circuit breakers
12
.
.
24
1.15
Notes:
Application determines
end of curve
Instantaneous
override(see Note 8)
.
.
300 ms
(P,Q,R)
120 ms
(M,N,O)
Inst.
(J,K,L)
15
7
.
4
2
12 I
i
1. Curve accuracy applies from –20C to +55C ambient. Temperatures above +85C cause an over-
temperature protection trip. For possible continuous ampere dertaing for ambient above 40C,
refer to Eaton.
2. Application frequency is 50/60 Hz.
3. There is a memory effect that can act to shorten the long delay. The memory effect comes into play
if a current above the long delay pick up value exists for a time and then is cleared by the tripping of
a down stream device or the circuit breaker itself. A subsequent overload will cause the circuit breaker
to tripin shorter time than normal. The amount of time delay reduction is inverse to the amount of
time that has elapsed since the previous overload. Approximately five minutes is required between
overloads tocompletely reset memory.
4. The right portion of the curve is determined by the interrupting rating of the circuit breaker.
The left portion of the curve is shown as a multiple of the long delay setting.
(long delay pick up = 115% of I ). Range is 110%–120%.
6. Total clearing times shown include the response times of the trip unit, the breaker opening, and the
interruption of the current.
7. The short delay pick up has nine settings/positions, 2–8, 10, 12.
8. For high fault current levels an additional fixed instantaneous hardware override is provided
(corresponding to SDPU position 9) at 12x (I ) and designated as 12I . Instantaneous tolerance is +/–20%.
9. For LD response and SD with flat response (this curve): TC01203015E
10. For LD response and SD with I T response curve, see: TC01203016E
11. For ground fault delay response curve, see: TC01203017E
12. Digitrip RMS 310+ trip units are suitable for functional field testing with test kit Cat. No. MTST120V.
For field testing using primary injection methods, follow NEMA publication AB 4-2003.
2
n
n
Maximum total
clearing time
Minimum total
clearing time
I
80A
160A
225A
I
A
B
C
D
E
F
G
H
15A
20A
30A
40A
50A
60A
70A
80A
60A
70A
80A
90A
100A
125A
150A
160A
100A
110A
125A
150A
160A
175A
200A
225A
i
Breaker
type
Symmetrical RMS amperes (kA) UL/CSA
FDE
HFDE
FDCE
240
V
Interrupting ratings—50/60 Hz
65
100
200
480 V
35
65
100
600 V
18
25
35
r n
TIME IN SECONDS
TIME IN SECONDS
1 MINUTE 1 HOUR 2 HOURS
Current in Multiples of (l
r
)
Current in Multiples of (l
r
)
Current in Multiples of (l
r
)
2
8
10
4
6
3
7
5
sec.
0.001
0.01
0.1
1
1000 10000 100000
Current in Amps
Interrupting
Rating
Determines
End of Curve
Fixed Instantaneous
Override
600V
480V
240V
Figure 3. Types FDE, HFDE, and FDCE 225A—Long/Short Delay—Curve Number TC01203015E
Digitrip 310+ Circuit Breaker Time/Current Curves (Phase Current)
Series C F-Frame Circuit Breakers
Catalog Types: FDE, HFDE, FDCE
Trip Unit Types: 32 (LSI), 36 (LSIG)
Available Sensors (I
n
): 80A, 160A, 225A
Long Delay (LD) and Short Delay (SD) with Flat Response
(I
r
) / (I
n
)
80A 160A 225A
A
B
C
D
E
F
G
H
15A 60A 100A
20A 70A 110A
30A 80A 125A
40A 90A 150A
50A 100A 160A
60A 125A 175A
70A 150A 200A
80A 160A 225A
Symmetrical RMS amperes (kAS) UL/CSA
FDE 65 35 18
HFDE 100 65 25
FDCE 200 100 25
240V 480V 600V
Breaker Type
Interrupting Rating—50/60 Hz
Notes:
1. Curve accuracy applies from –20C to +55C ambient. Temperatures above +85C cause an overtemperature
protection trip. For possible continuous ampere derating for ambient above 40C, refer to Eaton.
2. Application frequency is 50/60 Hz.
3. There is a memory effect that can act to shorten the long delay. The memory effect comes into play if a current
above the long delay pick up value exists for a time and then is cleared by the tripping of a down stream device
or the circuit breaker itself. A subsequent overload will cause the circuit breaker to trip in shorter time than
normal. The amount of time delay reduction is inverse to the amount of time that has elapsed since the previous
overload. Approximately ve minutes is required between overloads to completely reset memory.
4. The right portion of the curve is determined by the interrupting rating of the circuit breaker.
5. The left portion of the curve is shown as a multiple of the long delay setting.
(long delay pick up = 115% of I
n
). Range is 110%–120%.
6. Total clearing times shown include the response times of the trip unit, the breaker
opening, and the interruption of the current.
7. The short delay pick up has nine settings/positions, 2–8, 10, 12.
8. For high fault current levels an additional xed instantaneous hardware override is provided (corresponding to
SDPU position 9) at 12x (I
n
) and designated as 12I
i
. Instantaneous tolerance is +/–20%.
9. For LD response and SD with at response (this curve): TC01203015E.
10. For LD response and SD with I
2
T response curve, see: TC01203016E.
11. For ground fault delay response curve, see: TC01203017E.
12. Digitrip RMS 310+ trip units are suitable for functional eld testing with test kit Cat. No. MTS120V. For eld
testing using primary injection methods, follow NEMA publication AB-4-2003.