Covid 19 Crisis
We are open and able to ship available stock to you same day. HQ staffing reduced so some tasks (e.g. answering phones) might take longer.
Some restrictions on site visits. Please call and we shall do all we can to help.
Masterpact Centre of Excellence Logo

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 Masterpact NW circuit breaker protects and controls low voltage distribution systems.

We supply and fit replacements for ALL Masterpact NW unit parts.
We export parts around the world and are happy to provide guidance on installation by your local electrician.

  • Nominal current:800A to 6300A
  • Breaking performance:65 to 150 kA at 220/415 V AC
  • Voltage rating up to 690 V
  • Two physical sizes from 800 to 6300 A
  • Four Micrologic control units enriched by measurement, energy management and network analysis functions.