Siemens 3RB32066-1GC2 Thermal Overload Relay

Siemens 3RB2066-1GC2 Overload Relay, part of the Sirius 3RB2 family (some retailers list the same device as 3RB32066-1GC2), is an electronic motor-protection relay designed for 3‑phase motors up to 250 A F.L.C. and Class 10E protection. It is intended for use with S10/S12 frame contactors and can be mounted either standalone or directly on the contactor, with main-circuit connections via busbars and auxiliary wiring via screw terminals. The unit includes 1 NO/1 NC auxiliary contact and supports manual or automatic reset for trip recovery. Its compact housing measures 119 mm high, 120 mm wide, and 155 mm deep, and the overload release is electronic, offering precise protection up to 480 V (rated value) and 600 V across typical industrial installations. This relay is well suited for panel builders seeking integrated, standards-compliant motor protection with a single protective device for both main and auxiliary circuits.