Siemens SIRIUS 3RV1021-0JA15-ZW97 — Motor Protection Circuit Breaker, 1 A, Class 10
The Siemens SIRIUS 3RV1021-0JA15-ZW97 is a motor protection circuit breaker designed for the main current circuit, with a continuous rated current of 1 A and a rated motor power of 0.25 kW at 400 V AC. It is a Class 10 trip device, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor during a stall or locked-rotor event without nuisance tripping on normal start-up. The auxiliary switch is transversely designed and integrated, with ratings of 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V, covering typical PLC input and contactor coil loads. Breaking capacity is a standout: 100 kA at 240 V, 400 V, 500 V, and 690 V AC. That means it safely interrupts fault currents up to 100 kA without cascading upstream — critical for high-fault panels near large transformers. Phase failure detection is included; ground fault detection is not, so pair it with a separate ground-fault relay if that protection is needed.
Mounting and Integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. Width is 45 mm, height 97 mm, depth 96 mm — fits a standard 4-module-wide DIN slot. Mounting position is any orientation. Front protection class is IP20, so it's suited for enclosed panel use, not open washdown. Screw-type terminals for both main and auxiliary circuits: solid conductors accept 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²); stranded accept 2x (1...2.5 mm²) and 2x (2.5...6 mm²). AWG equivalent for main contacts is 2x (14...10). Zero clearance needed at the back or sides — the breaker can be stacked directly against adjacent devices.
Environmental and Compliance
Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Shock resistance is 25 g / 11 ms. The substance prohibition date (RoHS compliance) is 01.05.2012, indicating the part meets RoHS restrictions as of that date. Power dissipation in hot operating state at AC is 7.25 W — factor that into panel thermal calculations if multiple breakers are ganged. Maximum operating frequency at AC-3 duty is 15 operations per hour.