User Manual

Description
2.3 Protection system
3WA Air Circuit Breakers
52 Equipment Manual, 05/2021, 92310000002-03
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