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Motor-protective circuit-breaker
PKZM01, PKZM0 and PKZM4 |
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| Transformer-protective
circuit-breaker and current limiter |
PKZM0-T
The transformer-protective circuit-breaker is designed for protecting
transformer primaries. The short-circuit releases in the types from 0.16
A to 25 A are permanently set to 20 × Iu. The response ranges of the
short-circuit releases are higher here than with motor-protective
circuit-breakers in order to cope with the even higher inrush currents
of idling transformers without tripping. The overload release in the
PKZM0-T is set to the rated current of the transformer primary. With the
exception of the S00-...-PKZ0 high-capacity contact module, all the
PKZM0 system accessories can be combined with the PKZM0-T.
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PKZM0-...-C
The PKZM0 features a version with springloaded terminals. A version with
springloaded terminals on both sides, and a combined version which
features springloaded terminals on the outgoer side only can be chosen.
The conductors can be connected here without ferrules. The connections
are maintenance-free.
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CL-PKZ0
The current limiter module CL-PKZ0 is a short-circuit protective device
specially developed for the PKZM0 and PKZM4 for non-intrinsically-safe
areas. The CL module has the same base area and uses the same
termination's as the PKZM0. When they are mounted on a top-hat rail
alongside one another, it is possible to connect them by means of
B3...-PKZ0 three-phase commoning links. The switching capacity of the
series connected PKZM0 or PKZM4 + CL is 100 kA at 400 V. In a
short-circuit the contacts of the motor-protective circuit-breaker and
CL will open. While the current limiter returns to the closed rest
position, the motor-protective circuit-breaker trips via the
instantaneous release and produces a permanent isolating gap. The system
is ready to operate again, once any defect has been rectified. The
current limiter can conduct an uninterrupted current of 63 A. The module
may be used for individual or group protection. Any feed direction may
be used.
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| Individual and group protection using CL-PKZ0 |
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