7SR21 & 7SR22 Performance Specification
1000
500
100
50
Extremely Inverse
Very Inverse
Time
(sec)
10
Moderately Inverse
5
1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8 0.9
1
Current (multiples of setting)
Figure 2-4
ANSI IDMTL Reset Curves (Time Multiplier = 1)
Unrestricted Page 40 of 68
© 2013 Siemens Protection Devices Limited