Motor protection circuit breaker for panel builders and MRO
It's designed to protect motor circuits against overload, short circuit, and phase failure — the three faults that burn out windings and idle a line. That's fast enough to protect the motor but avoids nuisance tripping on startup inrush. That's high enough for most industrial panel secondary distribution. The 45 mm width fits one standard modular slot — easy to swap into an existing panel without re-drilling the backplate.
That's tight for a 100 kA device. Terminals accept 2x (0.75 to 2.5 mm²) solid/stranded or 2x 4 mm² — sized for standard motor circuit wiring. Screw terminals with M3 main contact screws; use a Pozidriv size 2 tip with a 5–6 mm shaft diameter. Storage and transport range -50 to +80 °C — fine for unheated warehouses or truck shipments in winter. Rated switching frequency at AC-3 and AC-3e is 15 operations per hour maximum — that's a motor start every 4 minutes. Not for high-cycle jogging or reversing service; that would need a contactor rated for higher mechanical life.
Why the ratings matter for your BOM
If one phase drops on a three-phase motor, the breaker trips before single-phasing cooks the winding. Ground fault detection is not included, so pair with a ground-fault relay if your installation requires it. The 100 kA breaking capacity at 240 V, 400 V, 500 V, and 690 V AC covers the common industrial voltages across North America and Europe. At 480 V and 600 V the rated current drops to 0.32 A — that's the thermal setting range, not the short-circuit rating.