LiftMaster 10-11420M1 E-Box for MGJ Commercial Door Operators
The LiftMaster 10-11420M1 is the MGJ electrical box assembly used in select LiftMaster commercial door operator service applications. In the field, this is the E-Box portion of the operator, the area that supports the control layout and electrical connections used to run the commercial door operator safely and consistently. It is ordered when the original MGJ electrical box is damaged, missing, or called out for replacement on the parts diagram.
This is not the same item as the 10-11403M cover. The cover closes over the box, while the 10-11420M1 is the E-Box assembly itself. That distinction matters because a damaged box, missing cover, and failed internal electrical component are three different repair situations. The correct repair starts by identifying the exact damaged part on the LiftMaster diagram.
The 10-11420M1 should be matched to select MGJ operator applications, especially medium-duty gear-reduced jackshaft operators where the manufacturer diagram lists this part number. Similar LiftMaster commercial operators can have different electrical boxes depending on voltage, series, wiring type, and mounting configuration.
Compatible With / Common Applications
- Select LiftMaster MGJ commercial jackshaft / gear-reduced operator applications
- MGJ E-Box replacement applications where the parts diagram lists 10-11420M1
- Commercial door operator repairs where the electrical box assembly, not just the cover, needs replacement
- Not a substitute for 10-11403M cover-only applications
- Not confirmed for K-MGJ5023, K-MH5025L, K-MH5025R, MH, HMJ, J, H, HJ, GH, or Logic 5 NEMA enclosures unless the parts diagram confirms it
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Commercial operator E-Box / electrical box assembly |
| Part Number | 10-11420M1 |
| Application | MGJ electrical box replacement |
| Compatible Operator Type | Select MGJ medium-duty commercial door operators |
| Included Components | Electrical box assembly; contents may vary by supplier |
| Notes | Match against the operator parts diagram and wiring configuration |
Also Known As / Related Part Numbers
- 10-11420M1
- K10-11420M1
- 1011420M1
- LiftMaster MGJ E-Box
- MGJ electrical box
- LiftMaster electrical box assembly MGJ
Technician Note
If the issue is only a bent or missing cover, 10-11403M may be the correct part instead. If the E-Box has wiring damage, corrosion, or a nonstandard modification, a technician should inspect the complete control area before parts are ordered.
Before Ordering
- Confirm the operator model is MGJ
- Confirm the E-Box part number from the diagram
- Check whether the repair calls for the box, the cover, or an internal electrical component
- Verify voltage and wiring type before service
- Photograph the existing wiring layout before any qualified service work begins
Professional Advisory
Commercial door operator electrical parts should be installed and tested by a qualified commercial door technician. Disconnect power before service, follow the operator wiring diagram, and do not bypass required safety devices, interlocks, or monitored entrapment protection.
Product Questions & Answers
What is the 10-11420M1 used for?
It is used as a replacement E-Box assembly for select LiftMaster MGJ commercial door operator applications.
Is this the same as the 10-11403M cover?
No. 10-11403M is the cover, while 10-11420M1 is the electrical box assembly.
Can this be used on MH or HMJ operators?
Not unless the LiftMaster parts diagram for that exact operator lists 10-11420M1.
Does this include the logic board or transformer?
Included contents can vary by service kit and supplier. Confirm what is included before ordering.
Should a technician install this part?
Yes. E-Box replacement involves commercial operator wiring and should be handled by a qualified commercial door technician.
