Siemens 3RU2146-4JD0 Motor Protection Relay Sirius

Siemens Sirius 3RU2146-4JD0 is a plug-in thermal overload relay for motor protection in three‑phase circuits, designed to mount on a contactor (Schützanbau) as part of the SIRIUS 3RU2 family. It is rated for 45–63 A and configured for Size S3 with a Class 10 trip characteristic, delivering dependable protection for motors during normal starting while guarding against overheating from overload or phase loss. The main circuit terminals are screw connections and the auxiliary circuit terminals are also screw connections, with manual or automatic reset after a trip. This relay is intended for use in motor starter assemblies to protect three‑phase motors from overheating due to overload or phase loss during normal starting, enabling seamless integration with Siemens Sirius contactors in panel installations.