Motor protection circuit breaker for the panel builder
The breaker integrates phase failure detection, so loss of one phase on a three-phase motor triggers a trip before single-phasing damages the winding. Rated breaking capacity hits 100 kA at 400 V AC and 500 V AC, dropping to 4 kA at 690 V AC. The gG backup fuse coordination at 400 V and 500 V is 32 A; at 690 V it steps down to 25 A. For a motor branch circuit, that tells the panel builder what maximum upstream fuse preserves the breaker's short-circuit ratings.
DIN-rail footprint and terminal details
Main circuit terminals accept 2× (0.75 to 2.5 mm²) solid or stranded, or 2× 4 mm². Screw-type terminals with M3 thread; Pozidriv size 2 screwdriver tip, shaft diameter 5 to 6 mm. Strip length and torque follow standard Siemens SIRIUS practice — no special tooling needed.
Operating conditions and lifecycle
Maximum switching frequency at AC-3 duty is 15 operations per hour. That is a thermal limit of the bimetal trip mechanism, not a contactor wear limit — fine for pump or fan starting cycles, but not for jogging or high-duty conveyor indexing.