Autonomous protection

Autonomous short-circuit protection, AZZ 4.xx is intended for the protection of MV lines against the consequences of short-circuits and overloads. The device is characterised by low power consumption and supplied with working current from current transformers. It is compatible with a low energy tripping coil of the circuit breaker. 

AZZ 4.xx is equipped with a PAT mechanism which enables verification of the correct performance of the protection with the use of external testing systems.

Technical specifications