Siemens 3RU2116-1BB0 Sirius Thermal Overload Relay

Siemens 3RU2116-1BB0 Sirius thermal overload relay is a 3-pole motor‑protection device that mounts to SIRIUS 3RU2 contactors to provide inverse‑time thermal protection against overload and phase failure. It offers an adjustable current setting from 1.4 to 2.0 A, is sized for S00 and Class 10 thermal protection, and features screw‑terminal terminals for both the main circuit and the auxiliary circuit, with a manual‑automatic‑reset option. Designed for 690 V AC main‑circuit operation, it is intended for contactor mounting and is part of the Sirius 3RU2 family. This relay protects motors by tripping when overheating would occur due to overload or phase loss, helping prevent motor damage and unplanned downtime.