The LiftMaster K03-35711 is an OEM contactor relay designed for select LiftMaster commercial door and gate operators. Featuring a 24V control coil and a 2NO + 2NC contact configuration, this replacement part manages high-voltage motor circuits from the operator’s low-voltage control board, supporting reliable start, stop, and directional control. It is commonly used in commercial and industrial operator panels to switch motor loads, interlock functions, and coordinate safety circuits, helping restore consistent operation when an original contactor has worn or failed.
Technical identification includes a 24-volt coil with two normally open and two normally closed contacts. Compatibility is model-specific; consult your LiftMaster operator’s parts diagram or service manual to confirm this part number before ordering or installing. For safety and compliance, installation should be performed by a qualified technician with power disconnected and proper lockout/tagout procedures followed. Verify the coil voltage and contact arrangement match your equipment, wire according to the LiftMaster schematic, and test all operator functions and safety devices after replacement. This genuine replacement contactor relay is suited for repair and maintenance of LiftMaster commercial door operators and gate operators where a 24V, 2NO/2NC control contactor is specified.