Siemens AG 3RU2126-4AB0 Thermal Overload Relay

Siemens 3RU2126-4AB0 Thermal Overload Relay delivers three‑pole motor protection with an adjustable trip range of 11–16 A and Class 10 protection, designed to mount directly onto Siemens 3RT2 size S0 contactors. The relay provides screw-terminal connections for both the main circuit and the auxiliary circuit, enabling straightforward wiring in control panels, while reset can be performed manually or automatically after a trip, depending on the installation. It is intended for IEC motor protection of three‑phase motors in industrial equipment such as conveyors, pumps, and fans, offering reliable thermal protection without compromising panel space thanks to its compact direct‑mount design. Part of the Siemens SIRIUS 3RU2 family, this model is specified for standard industrial ambient conditions and is commonly cited with an operating range from -40°C to +70°C, ensuring performance in harsh environments. With its precise 11–16 A setting and robust trip characteristics, it helps guard motors against overloads and current spikes while staying compatible with standard control circuits and mounting configurations.