The Siemens SIRIUS 3RV1021-0EA10-ZX95 is a motor-protection circuit breaker rated for 0.4 A continuous current with a Class 10 trip characteristic, designed to protect low-current motor loads in control panels. Its 100 kA breaking capacity at 400 V AC means it can safely interrupt high fault currents without cascading upstream — critical for selectivity coordination in a distribution panel. The unit mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, fitting standard panel layouts with a 45 mm width and 97 mm height.
Key Ratings and What They Mean for Fit
The 0.4 A continuous rating governs the motor FLA it protects — size this breaker to match the motor's nameplate full-load amps, not the supply capacity. The Class 10 trip provides fast overload response for standard induction motors, clearing within 10 seconds at 600% of set current. Rated operational voltage reaches 690 V AC, with the switching capacity holding at 100 kA across the 240 V to 690 V range (–). That SCCR headroom simplifies panel coordination — the breaker can be placed downstream of a transformer or main switch without derating. Phase failure detection is built in, so the breaker will trip on loss of one phase — a common failure mode in motor circuits that single-element overloads miss. Screw-type terminals on the main circuit accept solid or stranded conductors: 2x 1–2.5 mm² or 2x 2.5–6 mm² per pole. The AWG equivalent is 2x 14–10 AWG. No auxiliary contacts are included, but the design accepts add-on blocks if needed.
Integration and Deployment
Snap-on mounting onto 35 mm DIN rail per EN 50022 with zero clearance required at the sides or rear — the 45 mm width fits a standard 8-module spacing. Ambient operating range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Mounting position is any orientation. Shock resistance is rated at 25 g for 11 ms, suitable for industrial machinery and panel-mounted applications subject to vibration. IP20 finger-safe protection on the front — adequate for enclosed panels; no washdown rating, so keep this inside a cabinet.
Lifecycle and Sourcing
The SIRIUS 3RV family is a well-established platform; no direct official successor has been published for this order code.