Siemens 3RU2126-4EB0 is a size S0 thermal overload relay designed to protect three-phase motors by opening the circuit on overload or phase fault, with mounting intended for use on compatible Siemens contactors. It provides current-dependent protection with an adjustable trip current range of 27 to 32 A and a Class 10 trip rating. The relay uses screw terminals for both the main circuit and the auxiliary circuit and supports Manual-Automatic reset operation. Ambient operation ranges from -40°C to +70°C, aligning with typical industrial motor-control environments.
