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Center of Excellence

The dedicated Masterpact Resource Site of Leading UK switchgear experts PS Electrical

24/7 Emergency Call

We operate a 24/7 emergency call out service in support of air circuit breakers. If you're experiencing problems please call us directly

+44 (0) 1299 251 758


The Moeller IZM circuit breaker protects and controls low voltage distribution systems.
It is no longer supported by the OEM, Schneider Electric, such support having been discontinued in early 2014.

We supply and fit replacements for ALL Moeller IZM unit parts, including:

– complete refurbished Moeller IZM ACBs in all frame sizes, both 3 and 4 pole
– the best STR relay replacement unit available, with wireless communication option
– patented individual coil & motor replacement.

We export parts around the world and are happy to provide guidance on installation by your local electrician.

Please see below for the full range.

First introduced by Merlin Gerin in 19XX, it is estimated that several thousand Masterpact M / Moeller IZM units are still in use around the world. Our specialists at PS Electrical have personally serviced more than 1,000 Masterpact M / Moeller IZM units and we repair, replace and support severe hundred Masterpact M units every year.

Following the withdrawal of support by Schneider, we are the only ACB specialists to offer the option to extend the life of a Masterpact M/ Moeller IZM units by replacing individual coil & motors.