SIRIUS 3RV1021-0FA15-ZW98 — motor protection breaker, 0.5 A, CLASS 10
The Siemens 3RV1021-0FA15-ZW98 is a SIRIUS-branded motor protection circuit breaker, designed for motor protection. It carries a continuous current rating of 0.5 A and a CLASS 10 trip characteristic, meaning it disconnects within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts. Short-circuit breaking capacity is 100 kA at 400 V AC, which covers most industrial distribution panels without needing upstream current-limiting fuses. The unit also includes phase failure detection, so a lost phase on the line side will trip the breaker before the motor single-phases.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The 45 mm width and 97 mm height fit a standard 4-module slot in most enclosures. Depth is 96 mm, which clears typical 120 mm deep enclosures with room for wiring. Any mounting position is allowed. Terminals accept solid wire 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²), or stranded 2x (1...2.5 mm²) and 2x (2.5...6 mm²). Screw-type terminals for the main circuit — no special tooling needed.