Motor protection circuit breaker, 1 A, CLASS 10 — SIRIUS 3RV1021
The Siemens 3RV1021-0JA10-0FJ0-ZX95 is a SIRIUS motor protection circuit breaker designed for motor protection duty. It carries a rated continuous current of 1 A and a CLASS 10 trip characteristic, meaning it will trip within 10 seconds at 7.2× the current setting — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts. Breaking capacity is 100 kA at 400 V AC (and across the full voltage range up to 690 V AC), so it can safely interrupt fault currents up to that level without upstream fuses or a larger breaker — a key advantage for panels with high available fault current. Phase failure detection is built in, so the breaker will trip if one phase is lost, preventing single-phasing damage to the motor. Ground fault detection is not included — that requires an external module or a separate ground-fault relay.
Mounting and panel integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The 45 mm width means it occupies a single modular space — important for panel fill-factor planning. Any mounting position is allowed, so vertical or horizontal rail orientation is fine. Dimensions: 45 mm wide × 97 mm high × 96 mm deep. The 96 mm depth is the body depth behind the panel face — account for it when laying out gland plates and door clearance. Front face is IP20 — finger-safe but not washdown-rated. Suitable for enclosed panels only; not for outdoor or wet-area mounting without an additional enclosure.
Terminal and wiring details
Main circuit terminals are screw-type. Accepts solid or stranded conductors: 2× (1 … 2.5 mm²) or 2× (2.5 … 6 mm²) per terminal. AWG equivalents: 2× (14 … 10). Finely stranded conductors with core-end processing are also supported. No auxiliary contacts are included on this variant — an auxiliary switch block can be added if needed.
Environmental and endurance ratings
Operating temperature range: -20 to +60 °C; storage and transport: -50 to +80 °C. Maximum operating altitude: 2,000 m. Shock resistance: 25 g / 11 ms. Mechanical endurance of main contacts: 100,000 operations typical. Power dissipation at rated current in hot operating state: 7.25 W total, 2.4 W per pole. This matters for thermal management inside a sealed enclosure — account for the heat when sizing ventilation or cooling. Surge voltage resistance rated at 6,000 V — consistent with IEC 60947-2 overvoltage category III for industrial panels.
Lifecycle and sourcing
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time. For volume purchases or BOM-line commitments, submit an RFQ with target quantity and delivery window.