Siemens Argus 7SR21 - AFD ARC Flash Detector; (Refer to 7 XG31 Technical Manual for Performance Characteristics); Operate and Reset Level; Operate and Reset Time

7SR21 & 7SR22 Performance Specification
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2.25 50 AFD ARC Flash Detector
(Refer to 7XG31 Technical Manual for performance characteristics)
2.25.1 Reference
Parameter Value
50 AFD Setting 1, 2,...10 xIn
2.25.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, ± 10 %
Transient overreach (X/R £ 100) £ -30 %
Reset level
³ 95 % I
op
Repeatability
± 5 %
2.25.3 Operate and Reset Time
Attribute Value
t
basic
50AFD Overcurrent operate time 10 ms – 16 ms
t
op
AFD Zone operate time (Flash & 50AFD) 15 ms – 25 ms
Repeatability
± 10 ms
Disengaging time < 50 ms