What this SIRIUS breaker does in the panel
The Siemens 3RV1342-4JC10 is a 3-pole circuit breaker from the SIRIUS family, designed specifically for starter combinations — meaning it integrates directly with contactors to form a coordinated motor starter pair. Rated 63 A continuous and 30 kW at 400 V (AC-3), it handles the motor branch circuit for pumps, conveyors, and compressors up to that load. The IP20 front protection means it's finger-safe for the panel builder but expects an enclosure door for washdown or outdoor duty.
Breaking capacity and selectivity at a glance
Breaking capacity drops with voltage: 100 kA at 240 V and 400 V, then 15 kA at 500 V, and 7.5 kA at 690 V. The 690 V rating of 7.5 kA still covers most motor branch faults on 690 V industrial networks.
Main circuit terminals accept solid conductors 2x (2.5... 16 mm²) and stranded 2x (10... 50 mm²) or 1x (10... 70 mm²). For AWG, 2x (10... 1) solid and 1x (10... 2) stranded. The screw-type box terminals are standard for panel builders — no special tooling needed. Auxiliary and control circuits use separate screw terminals.
Shock resistance 25g / 11 ms. RoHS compliance date 07/01/2006 (substance prohibitance).