Siemens 3RU2116-1CJ0 Three-Phase Thermal Overload Relay

Siemens 3RU2116-1CJ0 is a compact S00-sized three-phase thermal overload relay from the SIRIUS 3RU2 family, designed to mount on a compatible contactor to protect small motors in 3‑phase circuits. It covers the main-circuit current range of 1.8–2.5 A and carries Class 10 thermal protection, making it suitable for motor protection on low‑load, small‑to‑medium applications. The relay is intended for mounting on the contactor’s main circuit, and both the main and auxiliary circuits use ring‑cable lug connections, with a manual‑automatic reset option for fault recovery. It has a quoted power loss of about 6.6 W at the rated current in hot operating state, reflecting its compact, low‑heat design. As a standalone overload relay in the Siemens 3RU2 lineup, 3RU2116‑1CJ0 is typically paired with Siemens contactors to provide reliable, trip‑controlled protection for three‑phase motors in industrial control panels.