SIRIUS 3RV1342-4HC10 — Motor Circuit Breaker for Starter Combinations
The Siemens 3RV1342-4HC10 is a SIRIUS-branded circuit breaker designed specifically for starter combinations. It carries a rated continuous current of 50 A and a rated insulation voltage of 690 V, making it suitable for motor branch circuits up to 22 kW at 400 V AC. Breaking capacity is 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 figure at 400 V means this breaker can safely interrupt a fault current up to 100,000 amps without upstream devices needing to clear it — critical for high-fault panels where the available short-circuit current exceeds typical 25 kA or 50 kA ratings. The 3-pole design is intended for three-phase motor loads. The absence of integrated ground-fault or phase-failure detection means those functions must be handled by an external relay or the upstream motor starter — this is standard for a motor circuit protector in a starter combination.
Mounting and Integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. Any mounting position is permitted. Zero clearance required at the back or sides, so it can be packed tightly on the rail — useful when panel space is at a premium. Dimensions are 70 mm wide, 165 mm high, 174 mm deep. Main circuit terminals are screw-type box terminals accepting solid conductors 2x (2.5 … 16 mm²) or stranded 2x (10 … 50 mm²) and 1x (10 … 70 mm²). AWG equivalents for main contacts are 2x (10 … 1) and 1x (10 … 2). Auxiliary and control circuit terminals are also screw-type. The box terminal design provides a reliable connection for higher-current motor circuits. IP20 protection on the front provides finger-safe touch protection.
Electrical Performance and Operating Conditions
Power dissipation in hot operating state is 27 W total, 9 W per pole. That's the heat you need to account for in your enclosure thermal calculation — at 50 A continuous, it's not negligible. Operating frequency at AC-3 duty is limited to 15 operations per hour maximum, so this breaker is sized for motor starting duty cycles, not high-speed switching. Operating temperature range is -20 to +60 °C, storage and transport -50 to +80 °C. Shock resistance is 25 g for 11 ms. Surge voltage resistance rated at 6,000 V. The product extension for auxiliary switches is supported, meaning you can add auxiliary contact blocks for status feedback to the PLC or for electrical interlocking. This is standard for motor circuit breakers used in starter combinations.
Lifecycle and Compliance
RoHS compliance date is July 1, 2006, meaning the design meets the EU RoHS directive for restricted substances. No other compliance marks (UL, CSA, CE) are listed in the evidence, but the SIRIUS series typically carries these approvals — verify the specific certification markings on the unit for your jurisdiction.