SIRIUS 3RV2321-1FC10 — Motor Circuit Breaker for Starter Combinations
The Siemens 3RV2321-1FC10 is a SIRIUS-branded circuit breaker designed specifically for starter combinations. It carries a 100 kA breaking capacity at 400 V AC, which means it can safely interrupt fault currents up to that level without upstream devices needing to coordinate — a critical spec for panel SCCR compliance under IEC 60947-2 and UL 508A. The 45 mm width and 97 mm depth fit standard 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening for tool-less installation or secure screw fixing in high-vibration environments.
Breaking Capacity and Motor Ratings
Breaking capacity holds at 100 kA across the common industrial voltages: 240 V, 400 V, and 500 V AC. At 690 V it drops to 4 kA — still adequate for most 690 V motor branch circuits, but verify coordination if the available fault current exceeds that figure. Motor horsepower ratings span 0.17 hp at 110/120 V up to 3 hp at 460/480 V and 575/600 V, covering fractional to medium motor loads common in conveyor, pump, and fan applications.
Mounting and Integration
The 45 mm width occupies two standard 22.5 mm module spaces. Mounting position is any orientation, which simplifies panel layout in tight enclosures. Clearance requirements: 50 mm upwards and downwards, 30 mm at the side, zero forwards or backwards — so it can be placed flush against a backplate or enclosure wall. Main contact terminals accept M4 screws and 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded wire.
Environmental and Operating Conditions
Rated insulation voltage spans 20 to 690 V, covering low-voltage control circuits through 690 V motor feeds. Operating temperature range is -20 to +60 °C, with storage and transport tolerance from -50 to +80 °C. The part does not include ground fault or phase failure detection — those functions must be provided externally if required by the application.