LiftMaster K-MGJ5011 Electrical Box Assembly for MGJ5011 Commercial Operator
The LiftMaster K-MGJ5011 E-box is a replacement electrical box assembly for the MGJ5011 commercial door operator family. The E-box serves as the operator's electrical control enclosure, protecting and organizing the control wiring and service components needed for the gear-reduced jackshaft operator to run correctly. Replacement may be needed after impact damage, corrosion, heat damage, failed internal components, or improper field wiring. It is important to match the box to the exact operator because medium-duty LiftMaster commercial operators can share similar naming while using different enclosures and wiring layouts. The K-MGJ5011 should be tied to the original MGJ5011 configuration and should not be chosen as a generic E-box for other MGJ, MJ, MH, or hazardous-location style operators without diagram confirmation.
Compatible With
- LiftMaster MGJ5011 commercial door operator applications where K-MGJ5011 is listed
- Select MGJ medium-duty gear-reduced jackshaft operators using the matching 5011 electrical box assembly
- Commercial sectional doors, high-lift doors, small rolling doors, shutters, and grilles using compatible MGJ5011 operators
- Related hazardous-application E-box references when confirmed by model and parts diagram
- Not automatically compatible with K-MGJ5023, K-MJ5011, K-MH5011, or other operator E-box assemblies
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Electrical box assembly / E-box |
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| Part Number | K-MGJ5011 |
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| Application | MGJ5011 commercial operator electrical box replacement |
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| Compatible Operator Type | Select MGJ medium-duty gear-reduced jackshaft operators |
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| Related Reference | N7GH1021M appears in some MGJ5011 E-box references |
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| Notes | Verify exact operator model and wiring layout |
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Also Known As / Related Part Numbers
- K-MGJ5011
- KMGJ5011
- MGJ5011 E-box
- LiftMaster K-MGJ5011 electrical box
- LiftMaster MGJ5011 electrical box assembly
- N7GH1021M related reference
- LM-K-MGJ5011
Technician Note
Before replacing an E-box, identify why the original failed. Water entry, overheated wiring, improper accessory wiring, or a shorted control circuit can damage a replacement if the root problem is not corrected.
Before Ordering Checklist
- Confirm the operator model is MGJ5011
- Match the original E-box part number and parts diagram
- Verify voltage, phase, and control circuit wiring
- Inspect for burned wiring, corrosion, or improper field modifications
- Test limits, wall station, safety devices, and radio controls after installation
Professional Advisory
This is not a low-risk accessory swap. Commercial operator electrical boxes contain line-voltage and control wiring, so installation should be completed by a trained commercial door technician.
Important Ordering Warnings
- Do not assume all MGJ E-boxes interchange
- Do not use if the parts diagram calls for K-MGJ5023 or another E-box
- Hazardous-location requirements must be verified by the site and operator documentation
Questions & Answers
What operator does K-MGJ5011 fit?
It is intended for select LiftMaster MGJ5011 commercial operator applications where the parts diagram lists this E-box.
Is this the same as K-MGJ5023?
No. Those are separate MGJ E-box references and should not be treated as interchangeable without documentation.
Can a damaged E-box cause intermittent operation?
Yes. Damaged wiring, corroded terminals, failed components, or loose connections in the E-box can cause unreliable operation.
Should the existing wiring be photographed before replacement?
Yes. Documenting the wiring helps confirm reconnection, but the final wiring should still match the official diagram.
Does this require a technician?
Yes. Line voltage and commercial door control wiring should be handled by a qualified technician.
