Motor protection circuit breaker — SIRIUS 3RV2011-1KA15
Rated for 100 kA breaking capacity at both 240 V and 400 V, meaning it can safely interrupt a fault up to that level without the upstream breaker needing to clear — critical for high-fault panels where you want selectivity without cascading upstream. The Class 10 trip characteristic (Trip Class CLASS 10) matches standard NEMA and IEC motor heating curves, so it protects the motor winding during a stalled-rotor condition without nuisance tripping on a normal start. Phase failure detection is built in — the unit trips if one phase drops out, preventing single-phasing damage to the motor. No ground fault detection on this variant, so if you need GF protection, you'll add an external module or specify a different SIRIUS frame.
Mounting and integration — DIN rail, 45 mm wide
Mounts via screw and snap-on onto standard 35 mm DIN rail per DIN EN 60715. At 45 mm wide (Width 45 mm) and 97 mm deep (Depth 97 mm), it occupies a single modular space — fits neatly into a motor control center (MCC) bucket or a standalone panel enclosure. Any mounting position is allowed (Mounting Position any), so you can orient it horizontally or vertically inside a tight gland plate. Clearance requirements: 50 mm upward and downward, 30 mm at the sides. Forwards and backwards clearance is zero — it can sit flush against the backplane or a neighboring device. That 50 mm vertical gap is the one to watch when stacking multiple breakers in a row; the arc-chute exhaust needs that space. Terminals for main contacts accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded copper — screw terminals (M3). That covers the typical motor feed from a 1.5 mm² control cable up to a 2.5 mm² power cable for a small motor branch.
Back-up fuse coordination — what the ratings mean
When the prospective fault current exceeds the breaker's interrupting rating, the manufacturer specifies back-up fuse limits: gL/gG 63 A at 400 V, gL/gG 50 A at 500 V, and gL/gG 40 A at 690 V. These are the maximum fuse ratings that, in series, allow the breaker to safely clear a fault without the fuse needing to blow first. If your panel has a 100 A upstream fuse at 400 V, you need a different breaker or a current-limiting fuse ahead of this one. The auxiliary contact ratings cover the control circuit: 1 A at 24 V, 0.5 A at 120/125/230 V, and 0.15 A at 60 V. That's enough to drive a PLC input or a contactor coil through an interposing relay, but not enough for direct coil drive on a large contactor — size your interposing relay accordingly.
Operating conditions and switching frequency
Rated for 15 switching operations per hour maximum under AC-3 and AC-3e duty — that's the standard motor-switching category (starting and stopping a squirrel-cage motor). If your application cycles more frequently (e.g., jogging or inching), you'll need to derate or move to a contactor-based solution with a separate overload relay. Ambient temperature range: -20 to +60 °C during operation, -50 to +80 °C during storage and transport. The operating range covers most indoor panel environments; the storage range is generous for warehouse or shipping conditions.