Moeller ZB12-4 Overload Relay

The Moeller ZB12-4 Thermal Overload Relay is a 3-pole electromechanical motor protection device designed for industrial motor control panels and starter systems. Used with Moeller (Eaton) contactors in conveyor systems, pumps, compressors, HVAC equipment, and manufacturing machinery, it provides thermal overload protection and phase-loss sensing for three‑phase motors. Key specs include an adjustable current range of 2.4 to 4 A, trip class 10A, rated operational voltage up to 690 VAC, and rated frequency 50/60 Hz, along with IP20 protection and screw terminals; it features 1 NO and 1 NC auxiliary contacts and a manual or automatic reset function. Mounting options are direct mount to a contactor or standalone, and it is compatible with Moeller DILM and DIL Series contactors. Operating temperature range is -25°C to +55°C, and it meets IEC 60947-4-1, UL 508, and CSA C22.2; certifications include CE, UL Listed, and CSA Certified. Common replacements include Eaton ZB12-6, Eaton XTOB004BC1, and ABB TA25-DU25.