Siemens OLR0430 Thermal Overload Relay Module

Siemens OLR0430 Thermal Overload Relay Module delivers reliable motor protection by monitoring load current and interrupting the circuit when an overload is detected. This compact relay is rated for a current range of 2.7–4.3 A and supports circuits up to 600 V, making it suitable for protecting small to mid‑sized three‑phase motors in industrial starters. Designed to integrate with compatible Siemens contactors, the OLR0430 serves as the overload protection component in standard motor starter assemblies, allowing quick field replacement within Siemens’ overload relay family. Common applications include conveyors, pumps, fans, and machine tools where automatic thermal protection helps prevent motor damage and reduces downtime. By pairing with the appropriate Siemens contactor, the OLR0430 forms a complete, field‑installable motor protection solution in control panels and automation cabinets.