Tronic Industrial 3-Pole Circuit Breaker – 400A, 21kA MCCB

Our review

This is a moulded case circuit breaker from Tronic, rated 400A across three poles, with a breaking capacity of 21kA at 400/415V. In plain terms, it is a heavy-duty protective device meant to sit on a three-phase supply and cut power when a fault or sustained overload threatens cables, motors, switchgear or other connected equipment. It suits industrial plants, workshops and larger commercial buildings where three-phase loads are normal and the available fault current is substantial. Before buying, confirm your system voltage is 400/415V, that 400A matches the load and cable rating, and that 21kA equals or exceeds the prospective short-circuit current at the point of installation. Also check the pole configuration, mounting method and terminal sizes against your panel design, since those details are not listed here. Compared with smaller miniature breakers or lower-rated MCCBs, this unit is chosen for higher current and stronger fault interruption, so it is not a casual substitute for a domestic board. If your demand is lighter, a lower-rated breaker may be cheaper and easier to fit; if your fault level is higher, you need a device with a greater breaking capacity. Have a qualified electrician verify discrimination and coordination with upstream and downstream devices before installation. Available on Sokonia.