Siemens 3RB3036-1UW1 Motor Protection Thermal Overload Relay

Siemens 3RB3036-1UW1 is a SIRIUS electronic overload relay designed for motor protection in three‑phase installations up to 690 V. It provides electronic current/thermal monitoring with a setting range of 12.5 to 50 A and is intended for stand‑alone installation with screw terminals on both the main circuit and the auxiliary circuit. The device features a size S2 housing and Class 10E thermal protection, and includes a 1 normally open (NO) and 1 normally closed (NC) contact arrangement for signaling and control interlocks. Reset behavior is manual‑automatic to suit different startup sequences. As part of the SIRIUS 3RB3 family, it is commonly paired with Siemens contactors to form compact motor protection solutions for pumps, fans, conveyors, and other three‑phase motors in industrial automation.