Eaton Digitrip 3000 series - Page 42

Instruction Leaflet DT3000
Page 38 Effective: Date 07/02 I.B. 17555D
For more information visit: www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
Figure 7-1a Inverse Time Overcurrent Phase, I
4
T Curves (SC-5390-92B)
DT 3100 & DT 3101 Users See Figure 7-1b
0.01
0.10
1.00
10.00
100.00
1000.00
10000.00
0.1 1 10 100
Multiple of In (I/I
n
)
Trip Time (seconds)
5 Seconds at 3 per Unit
40 Seconds at 3 per Unit
0.2 Seconds at 3 per Unit
Minimum Pickup 0.2 Maximum Pickup 2.2
Adjustable Inverse Time Overcurrent Pickup
(x I
n
) (0.2……….2.2)
Adjustable Inverse Time Overcurrent Time
Multiplier (Sec. @ 3 x I
n
) (0.2 s……….40 s)
Tolerance:
Inverse Time Overcurrent Pickup is ±5%
Long Delay Time Multiplier is ±10 or ±0.09 s
whichever is larger
Minimum Trip Time is 0.05 s
Note: Pickup of 0.2 x with Inverse Time
Overcurrent Time of 40 s @ 3 x makes T> 10000 s