Siemens 3RU2126-1HB0 Thermal Overload Relay

Siemens 3RU2126-1HB0 is a SIRIUS thermal overload relay that provides motor protection with an adjustable trip range from 5.5 to 8.0 A. Sized for Siemens S0 protection modules, it is intended for use with three‑phase motors in control panels and is designed to mount with compatible 3RU2 protection devices and contactors. Key specifications include a 5.5…8.0 A adjustable overload setting, thermal overload protection class 10, insulation rated up to 690 V, surge withstand of about 6 kV, and temperature compensation to maintain accurate protection across the operating range. The unit uses screw-terminals for reliable wiring and is built for demanding industrial environments, with an operating temperature range of -40°C to +70°C. It is a compact, purpose‑built protector within the Siemens SIRIUS 3RU2 family, designed to interrupt current in overload conditions to protect motor windings and extend motor life. Typical applications include protecting small to medium sized motors in conveyors, pumps, fans, machine tools, and processing equipment.