LiftMaster 041B4375-3 Terminal Block, No MOV
The LiftMaster 041B4375-3 terminal block is a low-voltage wiring component used on select LiftMaster and Chamberlain opener logic boards. It provides screw-terminal connection points for field wiring such as wall controls, safety sensors, and certain accessory circuits. When the terminal block is cracked, stripped, corroded, overheated, or loose, low-voltage accessories may work intermittently or fail even though the opener still has power.
This is the no-MOV version of the terminal block, so it should not be automatically substituted with terminal blocks that include MOV surge protection or a different board layout. Public manufacturer listings show this part as discontinued with no compatible replacement for some applications. Because it mounts to a specific logic-board assembly, verify the original board and parts diagram before upload or sale, especially when comparing it to 41A3150 or other terminal block kits.
Compatible With
Compatibility is based on the opener model, rail style, and the replacement parts diagram. Use the list below as a fitment guide, not as a universal interchange list.
- Select LiftMaster residential garage door opener logic boards requiring 041B4375-3
- Select Chamberlain residential garage door opener logic boards requiring 041B4375-3
- Public model references include 2500B, WD952KD, WD952KLD, and HD800D
- LiftMaster 3850 parts-list references include 41B4375-3 terminal block with screws
- Not interchangeable with terminal blocks that include MOV surge suppression unless the parts diagram confirms it
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Low-voltage terminal block |
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| Part Number | 041B4375-3 |
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| Application | Wall control, safety sensor, and accessory terminal wiring on select logic boards |
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| Compatible Operator Type | Select residential garage door opener logic boards |
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| Included Components | Service kit/components as supplied by manufacturer |
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| Notes | Verify original part number and parts diagram before ordering |
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| MOV Protection | No MOV |
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Also Known As / Related Part Numbers
- 041B4375-3
- 41B4375-3
- Terminal block with screws
- Terminal block, no MOV
- Term block without MOV
Technician Note
Match this part to the original LiftMaster or Chamberlain parts diagram. Similar-looking garage opener service parts can differ by rail style, opener generation, connector layout, or drive type.
Before Ordering
- Confirm the exact logic board parts diagram calls for 041B4375-3.
- Check whether the original terminal block has MOV protection or no MOV.
- Do not substitute 41A3150, 41D3150, or other terminal blocks without confirming board compatibility.
- Inspect the logic board for burned traces, water damage, or surge damage before replacing the block.
- Use a qualified garage door technician if board-level repair or electrical diagnosis is required.
Professional Advisory
For electrical diagnosis, spring-loaded door issues, damaged rail hardware, or unsafe door movement, use a qualified garage door technician. Do not bypass monitored safety devices or operate a door that is out of balance.
Important Ordering Warnings
- This part has been listed as discontinued by LiftMaster with no compatible replacement for some applications.
- Similar terminal blocks may fit physically but have different surge-protection or board connection requirements.
- This is for low-voltage control wiring only and is not a line-voltage wiring repair part.
Product Questions & Answers
What does no MOV mean on 041B4375-3?
No MOV means this terminal block does not include a metal oxide varistor surge-protection component.
Is 041B4375-3 still available from LiftMaster?
LiftMaster has listed 041B4375-3 as discontinued in some product listings, so availability and replacement options should be reviewed before upload.
Can I replace it with 41A3150?
Do not assume 41A3150 is a direct substitute. Compare the logic board parts diagram, MOV requirement, and connector layout before using a different terminal block.
What opener symptoms can come from a bad terminal block?
Loose or damaged terminals can cause intermittent wall control operation, safety sensor faults, or accessory wiring that will not stay secured.
Can this be used on gate operators?
It should only be used where the LiftMaster or Chamberlain parts diagram specifically calls for 041B4375-3 or 41B4375-3.
