Siemens 3RU2116-1GB0 is a three‑pole SIRIUS thermal overload relay (size S00) designed for motor protection, with a rated current range of 4.5 to 6.3 A and a Class 10 thermal trip. It mounts to Siemens 3RT contactors and uses screw terminals for both the main circuit and the auxiliary circuit, with a reset option that can be set to manual or automatic. The unit provides one normally open and one normally closed auxiliary contact and is rated for up to 690 V. It is compatible with Siemens 3RT contactors in the 2015–2018 series (3RT2015/2016/2017/2018) and is intended for protecting three‑phase motors in control panels.
