The Siemens 3RV2021-1DA15 is a SIRIUS motor protection circuit breaker designed for motor protection, with a CLASS 10 trip characteristic that clears overloads within 10 seconds at 7.2× rated current — matching the thermal curve of standard induction motors during startup. It delivers 100 kA breaking capacity at 400 V and 500 V, and 10 kA at 690 V, so it safely interrupts short-circuit faults up to those levels without cascading upstream.
Dimensions are 45 mm wide, 97 mm deep, and 97 mm high — fits standard panel cutouts and leaves clearance: 50 mm upward, 50 mm downward, and 30 mm at the side for wiring access and heat dissipation.
Auxiliary contact ratings and wiring
Auxiliary contacts are rated 1 A at 24 V, 0.5 A at 120/125/230 V, and 0.15 A at 60 V — enough for PLC inputs or relay coils in the control circuit. Main circuit terminals accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire, with M4 screw terminals for the main contacts.
Environmental and operational limits
Rated operating voltage range is 20…690 V. Maximum switching frequency under AC-3 duty is 15 operations per hour, sufficient for typical motor starting cycles on conveyors, pumps, and fans.