Specifications

59
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NS circuit breaker
Test sequences
Sequence Category Tests
of devices
1 - General characteristics All circuit breakers - trip unit control
- dielectric properties
- mechanical and electrical endurance
- overload
- dielectric voltage withstand
- temperature rise
- 145% calibration (3 phases test)
2 - Breaking capacity during operation All circuit breakers - breaking capacity during operation (Ot-CO-t-CO)
- dielectric voltage withstand
- temperature rise
- 145% calibration (3 phases test)
3 - Ultimate breaking capacity (Icu) A - 200% calibration (each pole separately)
B if Icu > Icw - ultimate breaking capacity (O-t-CO)
- dielectric voltage withstand
- 250% calibration (each pole separately)
4 - Admissible short duration current (Icw) B - 200% calibration (each pole separately)
- short-time current withstand
- temperature rise
- breaking capacity at admissible short-time current (O-t-CO)
- dielectric voltage withstand
- 200% calibration (each pole separately)
Combined sequence Icw = Ics replaces - 200% calibration (each pole separately)
sequences 2 and 4 - short-time current withstand Icw
Icw = Ics = Icu - breaking capacity at Ics (O-CO-CO) at maximum relay temp.
replaces sequences - dielectric voltage withstand
2, 3 and 4 - temperature rise
- 200% calibration (each pole separately)
IEC 947-2 test procedure
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NS circuit breaker: supplementary technical information