T53BLSI

T53BLSI, Westinghouse, Digitrip RMS 500, aftermarket basic retrofit kit style # 8188A20G03, Digitrip RMS trip units and programmers, programmable to any amperage requirement, 400 - 5000A, Solid State electronic, LSI - Long-Time, Short-Time and Instantaneous trip functions, suitable for use with DS,DSL,DSII,DSLII,SPB low voltage power air circuit breakers