Siemens 3RV2021-1KA10 Molded Case Circuit Breaker

Siemens 3RV2021-1KA10 is a 3-pole molded‑case circuit breaker (MCCB) in size S0 from the Sirius 3RV2 family, designed for motor protection. It mounts on a 35 mm DIN rail and is rated for main circuits up to 690 V AC with AC‑3 duty, making it suitable for starting and protecting AC motors. The thermal overload release is Class 10 and adjustable from 9 to 12.5 A, while the instantaneous magnetic release is rated at 163 A for short‑circuit protection. With three poles and screw‑terminal connections, the 3RV2021‑1KA10 delivers compact, integrated motor protection in a single device. Typical motor protections in this class cover motors up to about 5.5 kW at 220–690 VAC, aligning with the model’s 5.5 kW motor protection rating and DIN rail mounting in residential to industrial drives. This model is part of Siemens Sirius, offering standard switching capacity and compatibility within the 3RV2 family for coordinated protection in drives and equipment operating on 230 VAC to 690 VAC systems.