Westinghouse Electric Corporation QCHW3090 U Circuit Breaker

The Westinghouse QCHW3090 U Circuit Breaker is a 3-pole, 90 A thermal-magnetic circuit breaker (MPN QCHW3090) designed for dependable branch circuit protection in three-phase industrial and commercial power distribution systems. Rated for 240 V, it uses bolt-on mounting and is part of the QCHW series, providing reliable circuit interruption for overloads and short circuits in demanding environments such as distribution panels, motor control equipment, industrial machinery, and electrical service applications. Key specs include 90 A current rating, 240 V voltage, 3-pole configuration, 3-phase operation, bolt-on mounting, and a thermal-magnetic trip characteristic, making it well suited for replacement, retrofit, or panel upgrade projects in commercial and industrial facilities. Common replacements include Square D QOB390 and Siemens BQ3B090, illustrating cross-brand compatibility for high-amperage, three-pole applications while sustaining branch circuit protection and power distribution integrity.