Description
2.3 Protection system
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
55
2.3.5.4 Instantaneous short-circuit protection INST
With the instantaneous short-circuit protection, the power distribution system is
protected against power system faults such as:
• Phase-phase short-circuit
• Phase-neutral conductor short-circuit
• Phase-ground short-circuit
The circuit breaker trips when the rms value of a phase current or the neutral current
exceeds the setting of the instantaneous tripping current I
i
.
Characteristic
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