4200-003-20, MS26574-20L, Labinal Power Systems, Sub-miniature circuit breaker, high-performance, lightweight, sub-minature, longbutton version, 20 ampere rating, Qualified to MS26574 of MIL-C-5809, mil spec part # MS26574-20L. The 4200 is a sub-miniature, lightweight, trip free, single phase circuit breaker, which combines its compact size with a proven technological track record.