The Westinghouse 57-E-4664 is a three-phase, 150 A circuit breaker designed for 600 VAC systems. This 3-pole device provides circuit protection and fault interruption in industrial power distribution, and is commonly installed in switchgear, motor control centers (MCCs), and distribution panels. Its AG trip type and industrial-use designation make it suitable for replacement or retrofit projects and routine maintenance in manufacturing and utility facility electrical systems. Common replacements listed for context include Eaton HMCP150E3C, Siemens HMXD63B150, and Square D MGA36150.
