The LiftMaster K03-8024-D is a 24V reversing contactor replacement used in select LiftMaster commercial door operator electrical systems. It is part of the motor control circuit and is responsible for switching the operator between directions when the control board or station commands open or close movement.
This part is usually replaced when the original contactor is worn, overheated, stuck, or no longer pulling in reliably. It is a service component for commercial equipment, not a plug-in accessory, so the operator model and wiring diagram must be verified before ordering.
A reversing contactor routes power through the motor circuit so the operator can run in the open or close direction. In a properly wired operator, the contactor works with the control board, limit switches, safety circuits, brake circuit, and operator controls to provide controlled motor operation.
This part should be replaced only after confirming that the correct control voltage is present and that the original contactor, wiring, and motor circuit match the replacement. A new contactor can be damaged if the operator has a shorted motor winding, loose wiring, failed brake, water intrusion, or incorrect voltage.
The K03-8024-K is used with select LiftMaster commercial door and gate operators where the operator parts diagram calls for this contactor or a related number. Compatibility depends on operator family, control voltage, contactor layout, and production generation.
| Feature / Specification | Details |
|---|---|
| Manufacturer | LiftMaster |
| Product Type | Reversing contactor / mini contactor |
| Part Number | K03-8024-K |
| Related Number | 03-8024-K / 03-11112 style references |
| Application | Motor direction control in select commercial door and gate operators |
| Control Voltage | Commonly listed as 24V control coil applications |
| Compatible Operator Type | Select commercial door and gate operators |
| Notes | Match coil voltage, terminal layout, mounting style, and parts diagram. |
This part may be searched under several part-number formats, older listing numbers, catalog references, or related component numbers. Related numbers are included to help identify the correct item, but they should not be treated as interchangeable unless the operator parts diagram supports the match.
Confirm the exact contactor style before ordering. A contactor with the same physical size may still have a different coil voltage, terminal arrangement, auxiliary contact block, or mounting base. If the original part is badly burned, inspect the wiring harness and motor leads before installing the replacement.
This is an electrical service part inside a commercial operator enclosure. Disconnect power before service and use a qualified gate or commercial door technician for diagnosis or replacement. Do not bypass limits, safety devices, monitored entrapment protection, or operator interlocks to make a failed control circuit operate.
The K03-8024-D is a 24V reversing contactor used in select LiftMaster commercial door operator motor-control circuits.
They are related 24V contactor listings, but they should not be treated as interchangeable unless the operator parts diagram confirms the match.
Check the original part number, coil voltage, contact layout, terminal wiring, mounting style, operator model, and wiring diagram.
Yes. A worn or failed reversing contactor can cause an operator to run in only one direction or fail to respond even when the control circuit is calling for movement.
Yes. Burned contacts, repeated failure, or chattering can point to voltage, wiring, motor, brake, or control-board problems that should be corrected before installing a new contactor.