The Siemens 3RV1021-1JA15-ZX95 is a SIRIUS motor protection circuit breaker rated for 10 A continuous current with a Class 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping. Its 100 kA breaking capacity at 400 V AC handles high-fault-current panels — typical in industrial MCCs — without needing an upstream current-limiting fuse. Phase failure detection is built in, so a lost leg on the supply side trips the breaker and stops the motor before single-phasing damage occurs.
Mounting and panel integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. Zero clearance required at the sides and rear, so it packs tight on a DIN rail without forced air gaps. IP20 on the front means it's protected against finger contact — standard for enclosed panels, not for washdown zones. Any mounting position allowed, which simplifies layout in crowded enclosures.
Termination and wiring
Screw-type terminals on both main and auxiliary/control circuits. Solid wire range: 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²); stranded: 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²). AWG equivalent for main contacts is 2x (14 to 10). The dual-wire capacity per clamp is useful when looping through to a downstream contactor or control relay — no separate terminal block needed for the pass-through.