Westinghouse MA3800F is a 3-pole molded-case circuit breaker designed for 600 V systems, built on an 800 A frame. It uses a thermal-magnetic trip unit for overload and short-circuit protection and is commonly sold as a frame-only, bolt-on device with a listed interrupting capacity up to 30 kA at 480 V. As part of the MA series, the MA3800F is an older model that is still stocked by specialty distributors, even though catalogs in some contexts classify it as obsolete.
