Siemens 3RV1021-0EA15 Motor Protection Relay Module

Siemens 3RV1021-0EA15 is a Sirius 3RV1 motor protector/circuit breaker in size S0 that provides integrated motor protection with both thermal overload and magnetic short‑circuit protection for small to mid‑size motors, typically up to 100 A. It features an overload (A‑release) setting of 0.28 to 0.40 A, a magnetic release (N‑release) of 5.2 A, and a short‑circuit release also listed at 5.2 A, with screw terminals for secure wiring and a transverse auxiliary switch offering 1 NO and 1 NC contact for signaling or interlocking in control circuits. The device is rated Class 10 and is designed to be used in motor control panels alongside other Sirius protection gear and contactors to simplify protection and startup sequencing. The 3RV1021-0EA15 is documented as a predecessor to Siemens’ newer Sirius model 3RV2011-0EA15, which serves as the recommended successor in the Sirius line, helping maintain compatibility within established motor protection layouts while enabling a pathway to updated protection options. In practice, this unit is chosen when a compact, maintenance‑friendly solution is needed to safeguard small motors from overloads and short circuits while providing a convenient auxiliary signaling route within a standard Siemens motor control scheme.