The Siemens 3RV1042-4HA10 is a SIRIUS motor protection circuit breaker rated for 50 A continuous current, delivering 22 kW at 400 V AC in AC-3 duty. It's a current-production part — no obsolescence concern for BOM lines or spares planning. Breaking capacity hits 100 kA at both 240 V and 400 V AC, dropping to 15 kA at 500 V and 10 kA at 690 V. That 100 kA at 400 V gives solid SCCR headroom for most industrial distribution panels without needing upstream current-limiting fuses. No ground fault detection on this variant.
Any mounting position allowed. Zero clearance needed at the sides or rear — panel fill factor is tight. Main circuit terminals accept solid 2x (2.5 to 16 mm²) or stranded 2x (10 to 50 mm²), with a single conductor up to 70 mm². That covers most motor feeds up to 50 A without needing adapters or reducers.