The Siemens SIRIUS 3RV1021-1KA15-ZW97 is a motor protection circuit breaker rated for 12.5 A continuous current, sized for a 5.5 kW motor at 400 V AC. CLASS 10 trip class means it disconnects within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors during stalled-rotor conditions without nuisance tripping on normal starts. The 100 kA breaking capacity at 400 V AC lets this breaker sit upstream of a fault without cascading to the main bus; it interrupts the full short-circuit current the supply can deliver up to that level. 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 45 mm-wide slot on the DIN rail, leaving adjacent slots free for contactors or overloads. IP20 on the front; the enclosure protects against finger contact but is not sealed against washdown, so keep it inside a panel.
Sourcing & lifecycle
Current production — the manufacturer lists this part as active. It is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time. No last-time-buy or phase-out notice is in effect.
Termination & auxiliaries
Main current circuit uses screw-type terminals. Solid conductors: 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²). Stranded: 2x (1–2.5 mm²) and 2x (2.5–6 mm²). The auxiliary switch is transverse design, rated 1 A at 24 V, 0.5 A at 230 V, 0.15 A at 60 V. No factory-fitted auxiliary contacts — the transverse switch is built in for signaling the tripped state.
Environmental & mechanical limits
Operating temperature range –20 to +60 °C; storage and transport –50 to +80 °C. Shock rated at 25g for 11 ms. Mounting position is any — no derating needed for horizontal or inverted rail placement. Maximum operating altitude 2 000 m without derating. Power loss in hot operating state is 9.25 W at rated current.