SIRIUS 3RV2323-4AC10-ZX95 — Starter-Combination Circuit Breaker, Size S0
The Siemens 3RV2323-4AC10-ZX95 is a SIRIUS circuit breaker designed explicitly for starter combinations — meaning it integrates motor protection and disconnecting functions in one unit, sized for the S0 frame. At 480 V and 600 V it carries 16 A; at 690 V the breaking capacity is 4 kA, and the unit is backed by fuse ratings of gG 63 A at 400 V, gG 50 A at 500 V, and gG 40 A at 690 V.
The 16 A rating at 480/600 V AC sets the continuous current limit for the motor branch circuit it protects — match it to the full-load current of the motor, not the nameplate horsepower alone. The gG backup fuse ratings per voltage (63 A at 400 V, 50 A at 500 V, 40 A at 690 V) define the maximum fuse that can be placed ahead for coordination — exceeding those voids the SCCR.
The S0 frame measures 97 mm deep, 97 mm high, and 45 mm wide. Clearance requirements: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards. Main circuit terminals accept solid or stranded wire: 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²), terminated via M4 screws with a Pozidriv size 2 tip and a 5 to 6 mm diameter screwdriver shaft.