The LiftMaster K03-82115-D is an OEM motor contactor engineered for D-LINE commercial door operators. Its 115V coil energizes to switch line power to the operator’s motor, providing the reliable open/close control required for rolling steel and sectional door applications in industrial and commercial environments. As a direct-fit replacement part, it helps restore proper motor switching performance when a worn or failed contactor causes intermittent operation, humming, or failure to start.
Designed specifically for LiftMaster D-LINE controls, this contactor should be matched to systems that use a 115V control coil. It may be used as part of a forward/reverse contactor set depending on the operator’s wiring scheme. Installation should be performed by a qualified technician following the operator’s schematic and lockout/tagout procedures; tighten all connections to the torque specified in the service literature and verify interlocks and safety devices after replacement. Compatibility should be confirmed against the operator’s parts manual; this component is commonly referenced as K03-82115-D (also seen as 03-82115-D in some documentation). Ideal for maintaining uptime on LiftMaster commercial door openers, this genuine replacement supports dependable motor control in warehouses, loading docks, and other heavy-duty applications.