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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

Replacement Parts

Parts are available on application

We provide parts & services intended to keep your Mitsubishi Breaker in service and ensure it’s reliability. If you’re experiencing problems with the Mitsubishi Breaker please call us directly on +44 (0) 1299 251 758.

We operate a 24/7 emergency call out service in support of air circuit breakers, we carry spares for ABB, Terasaki, Mitsubishi, Schneider, Merlin Gerin, Square D & Moeller.


The Masterpact M 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 Masterpact M unit parts, including:

– complete refurbished Masterpact M 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 Masterpact M parts around the world and are happy to provide guidance on installation by your local electrician.

  • Nominal current: 800 to 6300A A
  • Breaking capacity from 40 to 150 kA rms
  • Voltage rating: up to 690 V
  • 3 and 4-pole versions
  • Fixed or drawout versions


First introduced by Merlin Gerin in 19XX, it is estimated that several thousand Masterpact M units are still in use around the world. Our specialists at PS Electrical have personally serviced more than 1,000 Masterpact M 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 units by replacing individual coil & motors.