LiftMaster APOW3 / K76-37251 Plug-In Gate Operator Power Supply
LiftMaster APOW3 / K76-37251 Plug-In Gate Operator Power Supply
The LiftMaster APOW3 is a plug-in power supply identified by the supplier as manufacturer part K76-37251. It serves the charging and power-input arrangement of compatible gate operators, including documented Miracle-One and LA500 applications. Select it by the operator manual and the existing supply label, not by the word transformer alone. Manufacturer Miracle-One documentation identifies APOW3 as a 34V DC supply; dealer descriptions sometimes mix AC and DC terminology, so the actual replacement rating and connection must be checked before installation.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| Miracle-One | The manufacturer parts list identifies APOW3; match the specific control-box configuration. |
| LA500 | The referenced manufacturer manual lists APOW3; check the actual operator revision and power arrangement. |
| LA412 solar-to-AC projects | Supplier identifies this use, but the complete conversion must be confirmed against the exact operator instructions. |
| Unrelated garage-door openers or generic adapters | No universal fit is established by plug style or brand name. |
Confirm the Power System Before Replacing the Supply
A gate that stops charging may have an outlet, wiring, battery or control-system fault. Have the installer check the complete charging path before replacing the supply. A new converter does not restore worn-out batteries or repair damaged field wiring. Record the existing supply label and the operator model so the replacement can be checked against both.
For a solar installation being changed to utility power, establish the approved wiring and control configuration before ordering. The converter alone is not a complete electrical installation, and it does not eliminate the battery requirements of an operator designed around battery-powered operation. Cable distance, wire size and the correct input terminals must follow the operator instructions rather than a generic adapter diagram.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Supplier model | APOW3 |
| Manufacturer reference | K76-37251 |
| Product type | Plug-in gate-operator power supply / AC-to-DC converter |
| Documented output reference | 34V DC in the Miracle-One manual; verify the supplied unit label |
| Documented applications | Miracle-One and LA500 manuals identify APOW3 |
| Selection requirements | Approved part number, input supply, output rating and connection arrangement |
Before Ordering
- Photograph the operator label and the complete existing power-supply rating label.
- Confirm APOW3 or K76-37251 in the applicable service documentation.
- Have outlet power, field wiring and battery condition checked.
- For a conversion, identify all required electrical work and manufacturer-approved setup changes.
Package Contents and Separate Requirements
This listing identifies the plug-in power supply. Batteries, a control board, an electrical outlet, field wiring and conversion labor are separate requirements. Confirm the current supply version, terminal arrangement and any included connector before ordering. The historical Miracle-One current rating should not be assumed to describe every replacement revision; use the actual supplied label and approved service reference.
Safety Warnings — Read Before Installation or Service
- WARNING: Incorrect supply voltage or wiring can damage the operator and create an electrical hazard. Use a qualified gate-systems installer.
- Disconnect utility power and all applicable battery or solar sources before servicing connections.
- Do not connect an AC-output substitute where the operator requires DC, or connect the supply directly to batteries without the approved charging arrangement.
- Protect the power supply and connections as required by the installation manual, then verify charging, gate travel and protection devices before normal use.
Related Products and Important Differences
- LMRRUL monitored photo eye — a separate safety accessory for approved gate systems; select its supply and wiring through the operator documentation.
- LMWEKITU monitored wireless edge kit — a separate monitored-edge system; APOW3 is not a direct power adapter for its transmitter.
Frequently Asked Questions
Is APOW3 an AC-output or DC-output supply?
The Miracle-One manufacturer parts list describes 34V DC output. Verify the current replacement label; conflicting dealer headings are not a wiring specification.
Does this replace the gate batteries?
No. Battery requirements remain those of the operator. The supply supports the approved power and charging arrangement.
Can it convert any solar gate to utility power?
No universal conversion is established. The supplier names an LA412 application, but the exact system and required changes must be verified.
Will it fix every low-battery fault?
No. Battery condition, input power, wiring and the charging electronics all require diagnosis.
Need Help Confirming the Right Product?
Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.
Details
Need Help With Compatibility?
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