Motor protection circuit breaker for the panel builder
The Siemens SIRIUS 3RV2011-1FA10-0BA0 is a size S00 motor protection circuit breaker designed to sit upstream of a contactor in a motor starter combination. Its Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor against locked-rotor heating without nuisance-tripping on normal start-up inrush. The breaker integrates phase failure detection, so loss of one phase on a three-phase motor triggers a trip before single-phasing damages the winding. Rated breaking capacity hits 100 kA at 400 V AC and 500 V AC, dropping to 4 kA at 690 V AC. That 100 kA figure at 400 V means this breaker can be applied on high-fault panels without needing a current-limiting upstream fuse for most industrial installations — it self-protects against the full prospective short-circuit current at that voltage level. The gG backup fuse coordination at 400 V and 500 V is 32 A; at 690 V it steps down to 25 A. For a motor branch circuit, that tells the panel builder what maximum upstream fuse preserves the breaker's short-circuit ratings.
DIN-rail footprint and terminal details
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 60715. The 45 mm width (three 15 mm module spaces) and 97 mm depth fit a standard motor starter row. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward — tight enough for dense panel layouts. Main circuit terminals accept 2× (0.75 to 2.5 mm²) solid or stranded, or 2× 4 mm². Screw-type terminals with M3 thread; Pozidriv size 2 screwdriver tip, shaft diameter 5 to 6 mm. Strip length and torque follow standard Siemens SIRIUS practice — no special tooling needed.
Operating conditions and lifecycle
Maximum switching frequency at AC-3 duty is 15 operations per hour. That is a thermal limit of the bimetal trip mechanism, not a contactor wear limit — fine for pump or fan starting cycles, but not for jogging or high-duty conveyor indexing.