Westinghouse B-56 Electrical Interlock Assembly

The Westinghouse B-56 Electrical Interlock Assembly is a panel-mounted device providing mechanical and electrical interlocking between control devices and switching equipment in industrial electrical control systems. It is designed for use in switchgear, motor control centers, control panels, and automated machinery, offering reliable interlock protection to prevent unsafe or simultaneous operation in commercial and industrial facilities, with compatibility for switchgear, motor starters, and control panels. Manufactured by Westinghouse with the MPN B-56, it supports replacement, retrofit, and safety-control upgrades, and is used by maintenance teams, OEM technicians, and system integrators for equipment operation prevention and safety lockout. Common replacements include Eaton mechanical interlock kits, Allen-Bradley electrical interlock assemblies, and Square D interlock mechanisms.