LiftMaster K75-12492 115V Brake Solenoid Kit for MT BMT MH MJ HMJ Medium-Duty Operators
The LiftMaster K75-12492 is a 115V brake solenoid replacement kit for select LiftMaster medium-duty commercial door operators. It is commonly used in brake assemblies on MT, BMT, MH, MJ, and HMJ operator families where the brake solenoid is listed as a service kit. In these operators, the brake solenoid helps release the brake when the operator runs and allows the brake to hold when the operator stops.
This part is especially important on commercial trolley, jackshaft, and hoist operator applications because brake drag, weak release, or incorrect brake holding can affect door travel and stopping control. It is not the same as a line-voltage Logic 5 K22 brake solenoid or a slide gate K71 internal brake solenoid. Related numbers such as 71106111K, K7512492, and K72-12492 are common in parts references, but the safest match is always the LiftMaster parts breakdown for the specific operator.
Before replacing the solenoid, confirm the brake assembly style and inspect the rest of the brake hardware. If the brake pad, plate, spring, linkage, or wiring is damaged, the solenoid alone may not correct the issue.
Compatible With
This part is used with select LiftMaster medium-duty commercial door operators that call for the K75-12492 115V brake solenoid kit.
- LiftMaster MT medium-duty trolley commercial door operators where specified
- LiftMaster BMT medium-duty trolley commercial door operators where specified
- LiftMaster MH medium-duty hoist commercial door operators where specified
- LiftMaster MJ medium-duty jackshaft commercial door operators where specified
- LiftMaster HMJ medium-duty hoist/jackshaft commercial door operators where specified
- 115V medium-duty brake assembly applications that list K75-12492, K7512492, K72-12492, or 71106111K
- Not a substitute for H industrial hoist K71-B120H / K71-B240H or Logic 5 K22 brake solenoid kits
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Brake solenoid replacement kit |
| Part Number | K75-12492 |
| Voltage | 115V |
| Application | Medium-duty commercial operator brake assembly |
| Compatible Operator Type | Trolley, jackshaft, and hoist commercial door operators |
| Common Model Families | MT, BMT, MH, MJ, HMJ |
| Notes | 115V brake kit; match to parts diagram |
Also Known As / Related Part Numbers
- K75-12492
- K7512492
- K72-12492
- 71106111K
- LiftMaster 115V brake solenoid kit
- Medium-duty brake solenoid kit
Technician Note
K75-12492 is commonly tied to medium-duty operator brake kits. Do not use it to replace a brake solenoid from a different voltage, phase, or operator class unless the exact parts diagram confirms it.
Before Ordering Checklist
- Confirm the operator family is MT, BMT, MH, MJ, or HMJ where listed
- Confirm the brake solenoid kit number is K75-12492 or a related reference
- Match the 115V brake circuit
- Inspect brake pads, plate, springs, linkage, and mounting hardware
- Test door operation, stopping, and safety controls after service
Professional Advisory
Commercial door operators can lift heavy doors and contain stored mechanical energy. If the brake is not holding or releasing correctly, do not continue operating the door until the brake and safety controls have been inspected.
Product Questions & Answers
Which models is K75-12492 commonly used with?
It is commonly listed for select LiftMaster MT, BMT, MH, MJ, and HMJ medium-duty commercial door operators.
What are the related numbers for K75-12492?
Related numbers include K7512492, K72-12492, and 71106111K.
Is K75-12492 a 115V kit?
Yes. It is a 115V brake solenoid replacement kit for supported medium-duty operator brake assemblies.
Can this be used on a Logic 5 industrial operator?
Only if the specific parts diagram lists it. Many Logic 5 industrial-duty brake applications use different K22 or K71 brake parts.
What else should be inspected when replacing this kit?
Inspect the brake plate, brake pads, springs, linkage, terminals, wiring, and operator stopping behavior.
