SIRIUS motor protection breaker — what the ratings mean for fit
The Siemens 3RV2011-1EA20-ZX95 is a SIRIUS motor protection circuit breaker sized for motor branch circuits. Its Trip Class 10 characteristic means it trips within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during locked-rotor events without nuisance tripping on normal starts. The 100 kA SCCR at 400 V (and also at 240 V and 500 V) tells you this breaker can safely interrupt a fault current up to 100 kA at those voltages, which covers most industrial distribution panels without needing upstream fuses to reduce the available fault current. At 690 V the SCCR drops to 4 kA, so if your line voltage is 690 V, verify the panel's available fault current is below that. The spring-loaded terminals accept 2× (0.5 to 4 mm²) solid or stranded wire — no screw torque to check, just strip and push. Phase failure detection is built in, so if one phase drops on a three-phase motor, the breaker opens before single-phasing damages the winding. Ground fault detection is not included, so if you need GF protection, add an external module or a separate GF breaker. The mounting position is any, and it snaps onto 35 mm DIN rail per DIN EN 60715 — standard panel integration, no special bracket needed. Ambient operating range is -20 to +60 °C; storage and transport range is -50 to +80 °C.
DIN rail footprint and clearances
Width is 45 mm, depth 97 mm, height 106 mm. For heat dissipation and access, allow 50 mm upwards, 50 mm downwards, 30 mm at the side. Zero clearance needed forwards or backwards. That 45 mm width matches the standard 2-module DIN-rail pitch — it occupies two 22.5 mm slots. The 97 mm depth means it protrudes about 10 mm more than a typical miniature breaker; check gland-plate depth if the panel is shallow.