Siemens 3RU2136-4RD0 is a thermal overload relay in the SIRIUS 3RU2 family, designed for motor protection and intended for use with compatible Siemens contactors. It is rated for 70–80 A and sized as S2 with a Class 10A trip characteristic. The device features screw-terminal main-circuit connections and spring-terminal auxiliary connections, and it supports both manual and automatic reset. This relay coordinates with Siemens 3RU2 contactors to protect medium-power motors in industrial control panels.
