Siemens 3RU2136-4QD0 Overload Relay

Siemens 3RU2136-4QD0 is a SIRIUS thermal overload relay (3RU2 family) rated for 47–57 A, designed to protect three‑phase motors and mount on Siemens contactors (Size S2) with Class 10 protection. It is a 3‑pole relay with a main circuit that uses screw terminals and an auxiliary circuit that uses spring‑type terminals, and it offers manual or automatic reset depending on installation needs. The device is rated for voltages up to 690 V and has a compact footprint of about 90 × 55 mm, compatible with 3RU2 contactor assemblies. This overload relay is intended for reliable motor protection in industrial drives and is a standard component within Siemens Sirius protection solutions.