The Siemens 3RV6311-0KC10 is a SIRIUS-branded circuit breaker in the S00 frame size, designed specifically for starter combinations — meaning it integrates directly with contactors in a motor feeder, providing both overload and short-circuit protection in one unit. Its 1.25 A rated operational current at AC-3 (400 V) and 690 V rated insulation voltage suit it for small motor loads or control transformers in 400 V three-phase panels. The 16 A instantaneous magnetic short-circuit trip responds fast enough to protect downstream contactors and cabling.
Mounting and integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width and 96 mm depth fit standard 45 mm-wide DIN slots; the S00 frame leaves clearance for adjacent components. Any mounting position is permitted. Screw-type terminals on top and bottom accept 2x (0.75 to 2.5 mm²) solid or stranded, or 2x 4 mm² — torque to 0.8 to 1.2 N·m. Clearance requirements: 50 mm above and below, 30 mm at the sides, zero forward or backward.
Sourcing note
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time. The part is genuine Siemens SIRIUS — same part, different passport, as I say. No warranty geofencing concerns on this standard catalog item.