P&B has a long established history, dating back more than 80 years of delivering cost effective, industry leading electrical power systems.

Today our experienced team of engineers and designers work with state-of-the-art technologies to deliver the highest quality British engineered solutions for our clients across the globe.


Our heritage

1932 ‘P&B Engineering Company’ is established, Crawley, UK


1944 P&B pioneers the development of their P&B GOLD Electromechanical Thermal Overload Relay for Motor Protection, which today remains in service throughout the world. The P&B brand is firmly established as the Motor Protection Relay specialists.


1951 ‘WM Shakeshaft Ltd’ is established, Manchester, UK


1954 ‘Weir Electrical Instrument Company’ is established, Corsham, UK


1986 PBSI Group Ltd is formed with the merger of P&B Engineering Company and WM Shakeshaft Ltd


1992 PBSI Group acquires the Weir Electrical Instrument Company strengthening its offering of earthing and safety equipment with Weir’s instruments and protection relay range.


P&B is a leading UK innovator of electrical protection, safety and control technologies.

Our specialist expertise and unrivalled experience is relied upon in heavy industries throughout the world to ensure the highest levels of safety and performance.