LiftMaster K-MH5025L E-Box for MGJ5025L / HMJ5025L Commercial Operator
The LiftMaster K-MH5025L E-Box is a replacement electrical/control box assembly used on select LiftMaster medium-duty commercial operator builds. In practical service terms, this is the enclosure and electrical-box platform that supports the operator control wiring and related internal components for the matching MGJ5025L / HMJ5025L style application. It is used when the existing box is damaged, corroded, missing, or otherwise no longer suitable for safe commercial door operation.
This part should be matched by the operator model tag and parts diagram, not only by appearance. The K-MH5025L number points to a left-hand / L suffix application in the MGJ/HMJ gearhead-hoist family, while a similar K-MH5025R or right-hand box can look close but be a different service part. Many medium-duty commercial door operators share a similar layout, but voltage, hand, hazardous-location classification, and control wiring can change the required E-Box.
For a service counter or installer, the best use of this listing is a direct replacement for an original E-Box that is identified as K-MH5025L or called out on the LiftMaster parts diagram for the matching MGJ5025L / HMJ5025L operator. Do not assume it fits every MGJ, MH, HMJ, or gearhead hoist operator without checking the diagram.
Compatible With / Common Applications
- Select LiftMaster MGJ5025L commercial operator applications where the parts diagram calls for K-MH5025L
- Select LiftMaster HMJ5025L / gearhead hoist commercial door operator applications where K-MH5025L is listed
- Medium-duty gearhead jackshaft or hoist operator service paths using the matching left-hand / L electrical box configuration
- Hazardous-location or special commercial operator builds only when the original diagram identifies this exact electrical box
- Not a confirmed substitute for K-MH5025R, MH5025R, MGJ5025R, MGJ5023, MGJ5011, or other similar E-Box assemblies unless the manufacturer diagram confirms the match
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Commercial door operator E-Box / electrical box assembly |
| Part Number | K-MH5025L |
| Application | MGJ5025L / HMJ5025L style medium-duty commercial operator service |
| Compatible Operator Type | Select gearhead hoist / jackshaft commercial door operators |
| Voltage / Configuration | Commonly associated with 230V left-hand service references; verify by operator tag |
| Notes | Match by model, hand, voltage, hazardous-location rating, and parts diagram |
Also Known As / Related Part Numbers
- K-MH5025L
- K-MH5025R
- MGJ5025L
- MGJ5025R
- HMJ5025L
- HMJ5025R
- N7GH3053M
- LiftMaster E-Box MGJ5025L
- LiftMaster electrical box HMJ5025L
Technician Note
The source row had K-MH5025L in the part-number field but K-MH5025R in the name/title. I wrote this as K-MH5025L because that is the manufacturer part number in the CSV. If your inventory is actually the right-hand K-MH5025R box, the name/title should be corrected before upload.
Before Ordering
- Confirm the operator model number and serial tag before ordering
- Compare the existing E-Box label to K-MH5025L
- Verify left-hand versus right-hand configuration
- Verify voltage and hazardous-location rating if applicable
- Use the exact LiftMaster replacement parts diagram for the operator
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
Is K-MH5025L the same as K-MH5025R?
No. The L and R suffixes can refer to different hand or configuration paths. Match the suffix from the operator parts diagram before ordering.
What operator family is this E-Box commonly associated with?
It is commonly associated with select LiftMaster MGJ5025L / HMJ5025L medium-duty gearhead hoist or jackshaft commercial operator applications.
Can this replace a damaged MGJ5023 electrical box?
Not automatically. MGJ5023 and MGJ5025L are different service references. Use the parts diagram to confirm the exact E-Box number.
Does this include every internal electrical component?
The included contents can vary by supplier and service kit. Confirm what is included with the current inventory before replacing the existing box.
Who should install this electrical box?
A qualified commercial door technician should install and test this part because it involves operator wiring, voltage configuration, and safety circuits.
