The Siemens 3RV1021-0JA15-ZX95 is a SIRIUS motor protection circuit breaker sized for a 0.25 kW motor at 400 V AC. It carries a 1 A continuous current rating and a Class 10 trip characteristic, meaning it will disconnect within 10 seconds at 7.2× the set current — fast enough to protect a standard induction motor during a locked-rotor event without nuisance tripping on startup inrush. The interrupting rating is a flat 100 kA across all common industrial voltages (240 V, 400 V, 500 V, 690 V AC), so it handles high available fault current without cascading upstream breakers. Phase failure detection is built in — a standard feature on SIRIUS motor-protection devices that catches single-phasing before the winding overheats.
Panel fit and wiring
Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022. The 45 mm width keeps the footprint tight in a multi-device motor control center. Screw-type terminals on the main circuit accept stranded conductors up to 2x 6 mm² or solid up to 2x 2.5 mm², so it handles standard motor feeder cables without adapters. Auxiliary contacts are transverse design, with space for one block. Clearances: zero mm required at the rear or sides, so you can butt-mount these against other devices on the rail. Front face is IP20 — finger-safe for panel access, but keep it inside an enclosure. Ambient operating range is -20 to +60 °C; storage and transport handle -50 to +80 °C. Shock rated at 25g for 11 ms, which covers most conveyor and pump vibration environments.
Sourcing and lifecycle
The lifecycle stage is marked as current, so this order code remains in Siemens' active catalog. It is sourced through independent distribution and quoted to order against an RFQ; availability and current pricing are confirmed at quote time.