3P 400A frame 600V Spectra Line 35k RMS Molded Case Circuit Breakers with LSIT functions by General Electric. Electronic Solid state RMS sensing trip system with field installable, front-mounted rating plugs to establish or change the breaker ampere rating. Adjustable instantaneous with tracking short-time is standard on all frames. The trip unit uses digital rating plug to determine the RMS value of sinusoidal and non-sinusoidal currents. Rating plug, lugs and shield not included. Factory carton.