Siemens 3RV1031-4FA10 Motor Protection Relay

Siemens 3RV1031-4FA10 is a Sirius motor protection circuit breaker sized as S2 for three‑phase motors, integrating thermal overload protection with magnetic short‑circuit protection in a compact, DIN‑rail‑mountable unit. It protects the connected motor by monitoring current and tripping on overload within Class 10 tolerances, with an adjustable overload current range specified at 28 to 40 A to align with motor FLA ratings. The device is three‑pole, uses screw terminals for straightforward wiring, and carries front‑end IP20 protection, making it suitable for panel installations in industrial environments. As part of the Siemens 3RV1 Sirius motor protector family, it provides a single‑device solution for both overload and short‑circuit protection, reducing the need for separate overload relays and simplifying control cabinet design when used with compatible Siemens contactors and control circuits. The 3RV1031‑4FA10 designation identifies a motor protection breaker intended for use in applications where a 28–40 A range is appropriate, delivering reliable protection for motors in typical industrial settings while maintaining compatibility with standard Siemens electrical assemblies and schematics.