Siemens 3RV2021-4BA10 Motor Protection Circuit Breaker

Siemens 3RV2021-4BA10 is a motor protection circuit breaker (MPCB) in the S0 size, designed for motor protection in industrial control panels by combining overload and short-circuit protection in a single device. It provides thermal-magnetic protection with an A-release adjustable from 13 to 20 A and a magnetic (N-release) trip up to 260 A, allowing precise coordination with motor starting currents and protecting conductors and cables from damage. Rated for 220 to 690 VAC operation and compatible with DIN rail mounting, this unit is commonly used for protecting motors in applications such as conveyors, pumps, and fans, with a typical motor power range around 7.5 kW at standard voltages. Physical dimensions are approximately 97 mm in height, 45 mm in width, and 97 mm in depth, and it uses screw terminals for secure wiring in control panels.