Motor protection breaker for 400 V panels
If one phase drops out on a three-phase motor, the breaker trips on the imbalance — prevents single-phasing damage that cooks windings. No ground fault detection on this variant, so pair it with a separate ground-fault relay if that's required for the installation.
Width is 45 mm, depth 75 mm, height 90 mm. Mounting position is any orientation. Clearance requirements: 20 mm upwards and downwards, 9 mm at the sides, 0 mm forwards and backwards — so it can be packed tight against the back panel and adjacent breakers. Screw-type terminals on the main circuit accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded copper. Terminal screws are M3. No special tools beyond a standard screwdriver.