Siemens 3RU2126-1CB0 Thermal Overload Relay Adjustable 1.8-2.5A

Siemens 3RU2126-1CB0 Thermal Overload Relay is a S0‑size, Class 10 motor protection relay that provides inverse‑time overload protection for three‑phase motors, with an adjustable trip current from 1.8 to 2.5 A. Designed to mount directly on Siemens 3RT size S0 contactors, it uses screw terminals for both the main circuit and the auxiliary circuit and includes one normally open and one normally closed auxiliary contact (1NO/1NC) for signaling or interlocking. It supports manual or automatic reset and is rated for up to 690 V AC in the main circuit, aligning with typical motor protection applications around 1.5 kW. This model is part of Siemens SIRIUS 3RU2 overload relays and is intended for cooperation with common 3RT contactors in compact control panels to deliver coordinated protection for driven loads.