The motor-protective circuit-breakers PKZM01, PKZM0 and PKZM4
The PKZM01, PKZM0 and PKZM4 use bimetallic releases which are delayed
depending on the magnitude of the current to offer a proven, technical
solution for motor protection. The releases are sensitive to phase
failure and are temperature-compensated. The rated current with the
PKZM0 up to 32 A is split into 15 ranges, for the PKZM01 it is split
into 12 ranges and for the PKZM4 up to 63 A into 7 ranges. The
installation (motor) and the supply cable are reliably protected by
short-circuit releases, permanently set to 14 × Iu. The motor start is
also guaranteed in every operational situation. The single-phasing
sensitivity of PKZM0 and PKZM4 allows for the use in the protection of
EEx e motors. An ATEX certificate has been awarded. The motor-protective
circuit-breakers are set to the rated motor current in order to protect
the motors.
The following accessories complement the motor-protective
circuit-breaker for the various secondary functions:
- Undervoltage release U,
- Shunt release A,
- Standard auxiliary contact NHI,
- Trip-indicating auxiliary contact AGM
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