Westinghouse 4LC400Q U Rating Plug

The Westinghouse 4LC400Q Rating Plug is a 400 A breaker-trip calibration plug designed to precisely coordinate trip settings in LC-series molded case circuit breakers and related switchgear. This breaker-installed plug assembly supports Seltronic trip type calibration for reliable overload protection in industrial distribution systems and is compatible with LC, LCA, LCG, LCGA, HLC, HLCA, HLCG, and HLCGA breaker frames. It is intended for industrial applications such as LC frame circuit breaker systems, motor control centers, and facility power distribution equipment used in manufacturing plants, utilities, and processing facilities, where accurate trip calibration and protection coordination are essential. Technical specs include Manufacturer Part Number 4LC400Q, Series 4LC, and an amperage rating of 400A, with the primary function of circuit breaker trip calibration and protection coordination; mounting is via a breaker-installed plug assembly and it supports industrial switchgear, MCC systems, and molded case breakers. Common replacements include Eaton 4LC400 Rating Plug, Westinghouse 4LCL400 Rating Plug, and Cutler-Hammer LC3400 400A Rating Plug.