20
Air Circuit Breakers
BT2 series
0.2
0.8
10
100
In
1
0.01
0.1
0.2
1
10
100
1000
t (s)
0.3
0.4
Maximum
Grounding current
I
r4
=(0.4~0.8)In(BT2-1600)
I
r4
=(0.2~0.8)In(BT2-2000, BT2-2500)
I
r4
=(0.2~0.6)In(BT2-4000)
I
r4
=(0.2~0.5)In(BT2-6300)
t
4
=0.1s~0.4s four steps
I
r4
Maximum 1000A (For BT2-1600)
Maximum 1200A (For BT2-2000, BT2-2500)
Maximum 1600A (For BT2-4000)
Maximum 2000A (For BT2-6300)
Characteristic curve
• T/I (time / current) curve of type M26, H26 and P26 intelligent controllers (OCR) for ground-fault protection