Westinghouse MCP431550R 150A 3P 600V Motor Circuit Protector

The Westinghouse MCP431550R is a robust motor circuit protector designed for industrial and commercial applications, providing magnetic-only trip functionality to safeguard motors from short circuits and faults without thermal overload protection. This 3-pole breaker is rated for 600 VAC and a continuous current of 150 amps, with an adjustable instantaneous trip setting ranging from 525 to 1750 amps, allowing customization to specific motor requirements. It is ideal for use in motor control centers, panelboards, and switchgear where reliable short-circuit protection is essential. Key features include a compact molded case design, UL listing for safety compliance, and compatibility with copper or aluminum conductors. Advantages over similar products include its proven Westinghouse reliability, ease of installation, and adjustable trip mechanism for precise protection. However, as a magnetic-only device, it requires separate overload relays for full motor protection, which may add to system complexity. This used unit has been cleaned and tested, showing minor wear but fully functional condition, making it a cost-effective alternative to new breakers for retrofits or replacements in manufacturing, HVAC, and pumping systems. Its durable construction ensures longevity in demanding environments, though obsolescence may limit parts availability since Westinghouse's circuit protection line is now under Eaton.