Westinghouse 457D943G21 Mechanical Interlock Switch

Westinghouse 457D943G21 Mechanical Interlock is a breaker-mounted interlock device designed to ensure coordinated breaker operation and enhanced safety within industrial power systems. It is used in industrial circuit breaker interlock and electrical safety systems and is commonly installed in JA-KA type breaker assemblies, switchgear equipment, and industrial power distribution networks in manufacturing and utility facilities. This 2-3 pole, industrial-duty mechanical interlock provides mechanical interlocking and safety control for breaker safety replacement, electrical maintenance, and retrofit projects across switchgear, molded case breaker assemblies, motor control centers (MCCs), and related industrial power distribution equipment. Key specifications include Manufacturer Part Number (MPN) 457D943G21; Brand Westinghouse; Product Type Mechanical Interlock; Breaker Type Compatibility JA-KA; Pole Configuration 2-3 Pole; Mounting Type Breaker-mounted assembly; Application Type Industrial circuit breaker systems; Industrial Compatibility Switchgear, MCC systems, and breaker equipment. Common replacements listed include Eaton JA-KA Mechanical Interlock KPRL3, Westinghouse 457D943G22 Mechanical Interlock, and Cutler-Hammer JA Frame Mechanical Interlock JT3200MK.