Motor protection breaker with spring terminals
The Siemens 3RV1011-1KA20-ZW97 is a SIRIUS motor protection circuit breaker rated for 12 A continuous current with a CLASS 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping on normal inrush. Phase failure detection is built in, so a lost phase on the line side triggers the trip — critical for preventing single-phasing damage on delta-connected motors. Breaking capacity runs 100 kA at 240 V AC, 50 kA at 400 V AC, 3 kA at 500 V AC, and 2 kA at 690 V AC (–), which covers most industrial distribution panels downstream of a transformer.
Mounting and wiring
Snap-on or screw-fixed onto 35 mm DIN rail per DIN EN 50022. Spring-loaded terminals on both main and auxiliary/control circuits — no screw torque to check, just strip and push. Accepts 2x (0.25 … 2.5 mm²) solid or 2x (0.25 … 1.5 mm²) finely stranded with ferrule. Width is 45 mm, height 90 mm, depth 81 mm. Zero clearance needed at the back or sides. IP20 on the front — fine inside a closed panel, not for washdown zones.