The Westinghouse LA3400F is a 3-pole molded-case circuit breaker with a 400 Amp frame and a 300 Amp trip rating, featuring a thermal-magnetic trip mechanism, designed for fixed mounting in industrial and commercial electrical distribution systems to provide overcurrent and short-circuit protection for high-capacity three-phase circuits. Rated for 600 V AC and suitable for panel-mounted use in switchgear, motor control centers, industrial machinery, and commercial electrical panels, it serves as reliable protection for power distribution systems. Common replacements include Eaton LA3400F, Cutler-Hammer LA3400F, and Square D LA36300.
