- Products - Molded Case Circuit Breaker 3SM29 Molded-case circuit-breaker Overview From 12.5 A to 1600 A; There are 6 sizes; Applications and functions Incoming and outgoing functioin in distribution system; Switching and protection of short-circuit and overload for motors, transformers and capacitors; Stopping and switching off in case of an emergency in conjunction with lockable rotary operating mechanism and terminal covers; Available versions: Power distribution: designed for the protection of cables, leads and non-motor loads; Motor protection: designed for optimized protection and direct-on-line starting of induction squirrel-cage motors. Features Complete current range There are 6 sizes and 26 rated current available, from 12.5 A to 1600 A. High breaking capacity from 20 kA to 100 kA Microporcess controlled Electronic trip unit is available for size C and above, to intelligentize the protection. Easy installation There are 3 available types of installation: Fixed version Plug-in version Withdrawable version Technical specifications Standard: IEC 60947-2 Number of poles: 3-pole, 4-pole N-pole current-carrying capacity for 4-pole MCCBs: 100% In Rated operating voltage Ue：400 V Rated insulating voltage Ui: 500 V, 690 V Rated frequency: 50/60 Hz Rated impulsed withstand voltage Uimp: 6 kV