Siemens 3RU2126-1EB0 is a Sirius thermal overload relay designed to protect motors and mount directly on Siemens 3RT2‑size contactors. It provides an adjustable tripping current from 2.8 A to 4.0 A, making it suitable for small three‑phase motors, and it uses a Size S0 package with Class 10 thermal performance. The relay features screw‑terminal main and auxiliary circuits and supports manual‑automatic reset operation for convenient protection control in motor circuits. It is rated for insulation up to 690 V and is compatible with the 3RT2 family (Size 0) contactors, such as the 3RT202 series.
