Liftmaster K77-37636, JUNCTION BOX, WITH ON/OFF AND RECEPTACLE
The LiftMaster K77-37636 is a replacement junction box assembly with on/off switch and receptacle for select CSW200U swing gate operators. It provides a factory-style service box location for operator power control and accessory/service receptacle needs within the supported operator configuration. It is commonly replaced when the original box, switch, receptacle, or enclosure is damaged, corroded, missing, or no longer safe to use.
Because this part involves line-voltage components, it should not be treated as a generic electrical box. The enclosure layout, switch configuration, receptacle style, operator wiring path, and mounting points must match the CSW200U parts diagram. Electrical work should be handled by a qualified technician or electrician when line voltage is involved.
Compatible With
Common Compatible Models
- LiftMaster CSW200U swing gate operators
- LiftMaster CSW200UL swing gate operators where the parts diagram specifies K77-37636
- LiftMaster CSW200501U swing gate operator references where listed
Additional Model Families to Verify
- Select CSW200 Series commercial swing gate operators
Important Compatibility Notes
- This is not a low-voltage accessory box. It includes on/off and receptacle functionality and must be wired safely.
- Do not substitute a generic junction box if the operator requires the factory LiftMaster assembly.
- Confirm voltage, wiring layout, and parts diagram before installation.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Junction box with on/off and receptacle |
| Part Number | K77-37636 |
| Application | Service junction box replacement |
| Compatible Operator Type | CSW200 Series swing gate operator |
| Common Models | CSW200U, CSW200UL, CSW200501U where specified |
| Electrical Note | Line-voltage work should be performed by a qualified technician |
| Notes | Match wiring and enclosure layout by parts diagram |
Also Known As / Related Part Numbers
- K77-37636
- K7737636
- LM-K77-37636
- LIF-K77-37636
- K77-37636 junction box
- Junction box with on/off and receptacle
Technician Note
Use this part when the original component is damaged, missing, cracked, corroded, worn, or no longer holding the related operator assembly correctly. Because many LiftMaster and Elite parts look similar across generations, final fitment should be based on the model number and replacement parts diagram, not appearance alone.
Before Ordering
- Match the part number on the existing component or the operator parts diagram.
- Confirm the operator model, series, voltage or configuration where applicable.
- Compare mounting points, cover shape, harness plugs, and included hardware before installation.
- Do not substitute similar-looking LiftMaster parts unless the parts diagram confirms the match.
Professional Advisory
Installation should be performed with power disconnected and the gate secured. For high-voltage wiring, damaged enclosures, missing safety devices, or uncertain fitment, use a qualified gate technician.
Product Questions & Answers
What is included with K77-37636?
It is listed as a junction box assembly with on/off and receptacle for select CSW200U swing gate operators.
Which operators commonly use this part?
It is commonly referenced for CSW200U and related CSW200UL/CSW200501U applications where the parts diagram specifies it.
Is this a universal electrical box?
No. It is an OEM LiftMaster junction box assembly for specific CSW200 configurations.
Can a homeowner wire this part?
Because line voltage may be present, wiring should be handled by a qualified gate technician or electrician.
Why should the parts diagram be checked?
The box must match the operator mounting pattern, wiring route, switch setup, and receptacle configuration.
