What this breaker covers
Siemens 3RV2031-4VA15 is a SIRIUS motor protection circuit breaker with a Class 10 trip curve and 30 kA breaking capacity at 400 V — it's the part you spec when a motor needs thermal overload and short-circuit protection in a single device, not two separate components. Phase failure detection is built in, so losing a phase trips the breaker without extra relay wiring. Rated for 20 to 690 V AC.
Lifecycle and sourcing
If you're filling a BOM or stocking spares, this one's easy to get. No need to source NOS or wait on a broker for a liquidation score — the supply's steady.
Mounting and wiring
Mounts via screw or snap-on onto 35 mm DIN rail per EN 60715, any position — no orientation restriction. Slips into a standard panel with 149 mm depth clear. Terminals accept 2x 0.5 to 2.5 mm² solid or stranded. Main contacts take M6 ring terminals for the power wiring.