The 4D protected poles mean all four poles have both thermal overload and magnetic short-circuit protection, with the neutral pole on the left. The TM-D trip unit gives LI protection: thermal (L) for overload, magnetic (I) for short-circuit. The neutral protection setting is 1 x Ir, meaning the neutral pole trips at the same threshold as the phase poles — standard for 4-pole distribution breakers.
Mounting and integration — backplate, screw terminals, front connections
Fixed mounting on a backplate, accepts horizontal or vertical orientation. Both line and load connections are front-access screw terminals, which simplifies busbar routing and cable dressing in a distribution board. Connection pitch is 25 mm. IP20 finger-safe protection — fine for enclosed panels, not for washdown areas. Dimensions: 100 mm wide, 130 mm high, 60 mm deep. The grey RAL 7035 housing matches standard enclosure interiors.
Durability and isolation — what the cycle counts tell you
Rated for 8000 electrical cycles at 415 V at full rated current, and 30000 mechanical cycles. That electrical endurance is typical for a distribution-grade MCCB — expect to replace it sooner in a frequent-switching application (like motor control) than in a backup feeder role.