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17
Air Circuit Breakers
BT2 series
kA
Instantaneous curve
I
r1
0.4
1
1.6
80
10
15
0.01
0.02
0.1
0.2
10
100
1000
10000
t (s)
0.3
0.4
1
I
r1
t
1
long-time delay curve
I
r2
t
2
Instantaneous range
I
2
T ON
I
2
T OFF
Short-time delay curve
Illustrational curve
The range of short-time delay
I
r2
=(0.4~15)In+OFF
t
2
=0.1s~0.4s
The range of long-time delay
I
r1
=(0.4~I)In
t
1
=10s~120s
Instantaneous
range
I
r3
= 1.6kA~35kA+OFF BT2-1600
2kA~50kA+OFF BT2-2000
2.5kA~50kA+OFF BT2-2500
4kA~65kA+OFF BT2-4000
6.3kA~80kA+OFF BT2-6300
Characteristic curve
• T/I (time / current) curve of type M25, M26, H26, P25 and P26 intelligent controllers (OCR)