9252000899 Rev —
BE1-50/51B-237/-238 General Information
1-3
Time Delay
Switch selectable—no intentional delay (SW3-2 open/off) or a fixed delay of 100 ms (SW3-2 closed/on).
Appendix A,
Characteristic Curves
illustrates the characteristic curve for the 50-A and 50-B elements.
Instantaneous Overcurrent B (50-B) Element
BE1-50/51B-237 Pickup
Setting Range:
1 to 15.9 Aac
Setting increment:
0.1 Aac
Accuracy: Sum
of
±
2% and
±
25 mAac
BE1-50/51B-238 Pickup
Setting Range:
0.2 to 3.18 Aac
Setting increment:
0.02 Aac
Accuracy: Sum
of
±
2% and
±
5 mAac
Dropout
Dropout occurs at 95% of pickup value.
Time Delay
Fixed at no intentional delay. Appendix A,
Characteristic Curves
illustrates the characteristic curve for the
50-A and 50-B elements.
Reset Characteristic
Resets within 16 ms of when sensed current decreases below the pickup level.
Current Sensing Input
BE1-50/51B-237
Continuous Rating:
14 Aac
∗
1 Second Rating:
400 Aac
∗
Continuous rating is 14 Aac for temperatures up to 45
°
C. See Figure 1-1 for derating curve.
Continuous Current
Current Sensing Input
0
2
4
6
8
10
12
14
16
-40
-20
0
20
40
60
Ambient Temperature (C)
Curren
t (Aac)
Figure 1-1. Current Sensing Input Derating Curve (BE1-50/51B-237)
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