LiftMaster K71-D3PH Three Phase Drum Brake Kit
The LiftMaster K71-D3PH is an internal solenoid drum brake kit used with select three-phase LiftMaster industrial-duty commercial door operators. The brake helps control stopping, reduce coasting, and hold the door position in applications where door weight and inertia require positive braking.
This kit is commonly used to service supported T, SD, J, H, and HJ commercial operator models in three-phase applications. It may be used as a replacement for an existing brake or as part of a supported brake add-on, depending on the operator design and manufacturer instructions.
Voltage and phase confirmation are critical. Some references describe the kit as 240V, while others reference three-phase 208/230/460V applications. Always use the operator nameplate, wiring diagram, and parts diagram before ordering.
Common Use Cases
- Replacing a failed three-phase internal drum brake kit
- Correcting door coasting, drifting, or delayed stopping on supported industrial operators
- Servicing LiftMaster three-phase Logic 3, Logic 4, or Logic 5 commercial door operators
- Replacing brake components after solenoid, cable, drum, or mounting hardware failure
- Maintaining controlled stopping on heavier commercial doors and grilles
Compatible With
The K71-D3PH kit is commonly listed for select LiftMaster three-phase Logic 3, Logic 4, and Logic 5 industrial-duty commercial door operators. Fitment depends on model, voltage, phase, and parts diagram.
- Select LiftMaster 3 Phase Logic 3 industrial-duty commercial door operators
- Select LiftMaster 3 Phase Logic 4 industrial-duty commercial door operators
- Select LiftMaster 3 Phase Logic 5 industrial-duty commercial door operators
- Select LiftMaster Model T industrial-duty commercial door operators
- Select LiftMaster Model SD industrial-duty commercial door operators
- Select LiftMaster Model J industrial-duty commercial door operators
- Select LiftMaster Model H industrial-duty commercial door operators
- Select LiftMaster Model HJ industrial-duty commercial door operators
- Three-phase brake applications where the parts diagram calls for K71-D3PH
Not Intended For
- 120V single-phase operators requiring K71-D1PH or another 1PH kit
- 575V operators requiring a 575V brake kit
- APT operators requiring K76-37077 or APT-specific brake parts
- Operators with caliper-style brake parts unless the manufacturer instructions support this drum brake kit
- Residential garage door openers or light-duty commercial operators
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Internal solenoid drum brake kit with cable |
| Part Number | K71-D3PH |
| Voltage / Phase | Commonly listed as 240V three phase; verify exact operator voltage and product label |
| Application | Brake replacement or brake add-on for select industrial-duty commercial door operators |
| Compatible Operator Type | Select LiftMaster 3 Phase Logic 3, Logic 4, and Logic 5 T, SD, J, H, and HJ operators |
| Included Components | Solenoid cover, brake solenoid, drum brake, cable, mounting plate, installation hardware |
| Function | Provides controlled stopping and holding for supported three-phase operators |
| Notes | Verify voltage, phase, model, logic generation, and brake style before ordering. |
Also Known As / Related Part Numbers
- LiftMaster K71-D3PH
- K71-D3PH
- K71 D3PH
- 71-D3PH
- 3PH Drum Brake Kit
- 240V Drum Brake Kit
- Three Phase Drum Brake Kit
- Internal Solenoid Drum Brake with Cable
Related brake kits that are not automatically interchangeable: K71-D1PH, K71-D575-1, K71-B3PH, K71-B1PH, 71-B240, 71-B575, and K76-37077. Confirm voltage, phase, and operator model before ordering.
Technician Note
Do not order a brake kit by horsepower or model family alone. Confirm phase and voltage directly from the operator nameplate and parts diagram.
If replacing a different brake style, compare the mounting plate, drum, solenoid, cable, and wiring method before removing the old assembly.
Before Ordering, Confirm
- The operator parts diagram calls for K71-D3PH.
- The operator is a compatible three-phase LiftMaster industrial-duty commercial door operator.
- The operator logic generation and model match the application.
- The voltage on the operator nameplate matches the brake kit being ordered.
- The door condition and balance have been checked so brake symptoms are not being caused by the door itself.
- The installer is qualified to work on commercial three-phase operator wiring.
Professional Advisory
Three-phase commercial door operators contain hazardous voltage and moving mechanical parts. Brake kit installation should be performed only by a qualified commercial door technician or electrician familiar with the operator.
After installation, test brake release, brake holding, door travel, limits, safety devices, and manual operation before returning the operator to service.
Product Q&A
Is K71-D3PH a three-phase brake kit?
Yes. K71-D3PH is a three-phase internal solenoid drum brake kit for select LiftMaster industrial-duty commercial door operators.
Which models commonly use K71-D3PH?
It is commonly listed for select three-phase LiftMaster Logic 3, Logic 4, and Logic 5 T, SD, J, H, and HJ operators.
Is this the same as K71-D1PH?
No. K71-D1PH is the 120V single-phase drum brake kit. K71-D3PH is for supported three-phase applications.
Why should voltage be checked before ordering?
Brake coil and wiring requirements are voltage-sensitive. The operator nameplate and parts diagram should be checked before ordering this kit.
