LiftMaster K073A0003 Line Filter Overview
The LiftMaster K073A0003 line filter is an electrical replacement part used in select LiftMaster barrier and slide gate operators. Its job is to help reduce electromagnetic interference and electrical noise entering the operator electronics through the power circuit. In barrier systems and commercial slide operators, clean power can be important for reliable control-board operation, accessory performance, and reduced nuisance issues caused by power-line noise.
This part is not a universal electrical filter for every LiftMaster operator. Listings describe it for various LiftMaster barrier gate and slide gate operator models, with additional references to MA, MAS, MAST, and MAT barrier operator families. Because voltage, wiring layout, enclosure design, and operator generation matter, the replacement should be matched by part number and parts diagram. Symptoms that look like a bad line filter can also come from poor incoming power, surge damage, a failed control board, loose wiring, or grounding issues.
Compatible With
Current listings support the following compatibility range:
- Various LiftMaster barrier gate operator models that list K073A0003 as the line filter
- Various LiftMaster slide gate operator models that list K073A0003 as the line filter
- Commonly associated with MA, MAS, MAST, and MAT barrier operator references
- Mega Arm / Mega Sprint style barrier operator applications where the parts diagram supports this line filter
- Not a universal line filter for every LiftMaster gate or door operator
Features and Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Line filter replacement kit |
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| Part Number | K073A0003 |
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| Application | Electrical noise / EMI filtering in select gate operator power circuits |
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| Compatible Operator Type | Select barrier gate and slide gate operators |
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| Related Numbers | 73A3, 073A0003 |
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| Notes | Electrical part; match operator voltage and parts diagram |
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Also Known As / Related Part Numbers
- K073A0003
- 073A0003
- 73A3
- LiftMaster line filter
- LiftMaster barrier operator line filter
- Mega Arm line filter reference
- Mega Sprint line filter reference
Technician Note
If an operator has repeated board failures or erratic electronics, inspect incoming voltage, grounding, surge protection, wiring connections, and the line filter. Replacing the filter alone will not correct poor site power.
Before Ordering
- Confirm the operator parts diagram calls for K073A0003
- Verify the operator family and voltage before ordering
- Inspect for surge damage, loose wiring, corrosion, and heat marks
- Do not reuse damaged electrical connectors or compromised wiring
- Have high-voltage diagnosis performed by a qualified gate technician
Professional Advisory
This is an electrical cabinet component. Disconnect all power before service and do not attempt high-voltage wiring work without proper training.
Product Questions and Answers
What does the K073A0003 line filter do?
It helps reduce electrical noise or EMI in select LiftMaster barrier and slide gate operator power circuits.
Which operators use K073A0003?
It is listed for various LiftMaster barrier gate and slide gate operators, with MA, MAS, MAST, and MAT barrier references commonly noted.
What are related part numbers?
Related references include 73A3 and 073A0003.
Can a bad line filter cause control problems?
It can contribute to electrical noise issues, but erratic operation can also be caused by bad power, grounding, surge damage, or a failing board.
Should a technician install this part?
Yes. Because it is part of the operator electrical system, a qualified gate technician should handle replacement when high-voltage wiring is involved.
