What it is and where it fits
The Siemens 3RV6011-1FA15 is a SIRIUS motor protection circuit breaker in the S00 frame size — the smallest of the SIRIUS molded-case family, sized for fractional-horsepower to small motor loads. It combines a thermal overload relay (Class 10 trip) and a magnetic short-circuit release in one package, so it protects the motor and the feeder from overload and fault currents without needing a separate overload relay. Rated 5 A at AC-3 and 690 V maximum. The 6 W typical power loss is low enough for tight DIN-rail packing. Mounts on 35 mm DIN rail per DIN EN 60715 — screw or snap-on, any position. The 45 mm width and 96 mm depth leave room for a contactor alongside.
Lifecycle and sourcing reality
RoHS compliance with a substance prohibition date of 05/01/2012. IEC ratings (690 V, 6 kV surge voltage, 25g shock) support CE marking.
Key ratings and what they mean for fit
The Class 10 trip class means the thermal overload element will trip within 10 seconds at 7.2× the current setting — fast enough to protect a standard induction motor during a stalled-rotor condition, but not so fast that it nuisance-trips on normal starting inrush. This is the standard choice for general-purpose motor protection in conveyors, pumps, and fans. The magnetic short-circuit release is fixed (non-adjustable) and set to trip instantaneously on high fault currents — typical for a motor-protective device that must clear a bolted fault before the contactor or upstream breaker sees damage. The 6 kV rated surge voltage resistance (impulse withstand) tells you the insulation coordination is adequate for 400 V systems with standard overvoltage category III. Operating temperature range of -20 to +60 °C covers most indoor panel environments; storage range of -50 to +80 °C is wider, so it survives shipping and warehouse extremes. The 10 to 95 % relative humidity rating (non-condensing) is typical for IP20 finger-safe terminals — not for washdown areas.
Termination and wiring
Screw-type terminals on both the main circuit and the auxiliary/control circuit. The main terminals accept 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²) — that is two wires per pole, which is handy for daisy-chaining the supply to a contactor coil. AWG equivalents are 2× (18 to 12) for the mains and 2× (20 to 16) for the aux contacts. Tightening torque is 0.8 to 1.2 N·m — a standard small screwdriver, no torque wrench needed. The auxiliary switch is transverse design, keeping overall depth at 96 mm. Clearance: 50 mm above and below, 30 mm to the side, zero forward or backward.