What it is and where it fits
The Siemens 3RV6311-1DC10 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates overload protection and short-circuit interruption in one device for motor branch circuits. Size S00, three poles, rated operational current 3.2 A. The magnetic instantaneous short-circuit trip responds at 42 A, so it clears a bolted fault before the contactor or overload relay can weld. Mounts on 35 mm DIN rail per DIN EN 60715, any position, screw and snap-on. That 45 mm width and 96 mm depth fit a standard S00 footprint; panel builders already planning around that frame size can drop this in without re-laying out the gland plate.
Ratings that matter for the line
At 400 V AC-3 duty — the standard motor-switching category — the 3RV6311-1DC10 carries 3.2 A continuously. That is the figure that governs motor sizing: a 3.2 A AC-3 rating typically covers a 0.75 kW to 1.1 kW three-phase induction motor at 400 V, depending on full-load amps. The insulation voltage is rated 690 V with pollution degree 3, and surge withstand is 6 kV. Operating frequency maxes at 15 switching cycles per hour at AC-3, which is fine for a conveyor or pump start-stop but not for a rapid-reversing application. Ambient range -20 to +60 °C during operation.
Mounting and wiring details
Screw-type terminals on top and bottom for the main circuit. Accepts two conductors per terminal: solid or stranded 2x 0.75…2.5 mm², or 2x 4 mm². For finely stranded with ferrule, 2x 0.5…1.5 mm² or 2x 0.75…2.5 mm². AWG equivalent 2x 18 to 12 or 2x 20 to 16. Tightening torque 0.8…1.2 N·m. Clearance required: 50 mm above and below, 30 mm at the sides — that keeps the arc-chamber vents clear and meets IEC spacing for 690 V. No forward or backward clearance needed.