Liftmaster K-SL5755021G3, E-BOX, SL575, 230V, 1PH, 1/2HP
The LiftMaster K-SL5755021G3 is a replacement E-box assembly for select SL575 commercial slide gate operator configurations. On an SL575, the E-box is the central electrical enclosure that organizes the operator control components, power wiring, terminal connections, and related service hardware. It is often replaced after severe electrical damage, water intrusion, internal corrosion, cabinet damage, or when a technician determines that a complete box assembly is more practical than replacing individual parts. This specific configuration is tied to 230V, 1-phase, 1/2 HP, so it must match the operator nameplate and parts diagram. SL575 E-boxes look similar across configurations, but voltage, phase, and horsepower differences can make them non-interchangeable.
Compatible With
- LiftMaster SL575 Series slide gate operators with 230V, 1-phase, 1/2 HP configuration
- LiftMaster SL575 commercial slide gate operator family when the model nameplate and parts diagram match this E-box number
- SL575 heavy-duty commercial / light industrial slide gate installations using the same electrical configuration
- Related SL575, SL585, and SL595 control-box part diagrams may list similar parts, but this E-box should only be used where this exact part number is specified
Features & Specifications
| Manufacturer | LiftMaster |
|---|
| Product Type | E-box replacement kit |
|---|
| Part Number | K-SL5755021G3 |
|---|
| Application | SL575 slide gate operator electrical box replacement |
|---|
| Compatible Operator Type | Commercial slide gate operator |
|---|
| Model Family | SL575 |
|---|
| Voltage | 230V |
|---|
| Phase | 1-phase |
|---|
| Horsepower | 1/2 HP |
|---|
| Notes | Match model nameplate, voltage, phase, horsepower, and parts diagram |
|---|
Also Known As / Related Part Numbers
- K-SL5755021G3
- KSL5755021G3
- KSL5755021G3
- SL5755021G3
- SL575 E-box
- SL575 230V 1-phase E-box
- SL575 1/2 HP E-box
Technician Note
Before replacing an E-box, determine why the original assembly failed. Water intrusion, shorted accessories, incorrect incoming power, lightning damage, or a failing motor can damage a new electrical box if the root cause is not corrected.
Before Ordering
- Confirm the operator is an SL575 Series slide gate operator
- Match the voltage on the operator nameplate
- Match single-phase or three-phase power exactly
- Match horsepower exactly where listed
- Compare the original E-box part number to the replacement parts diagram
- Inspect incoming power, grounding, accessories, and safety wiring before energizing the unit
Important Ordering Warnings
- Do not substitute this E-box for a different voltage, phase, or horsepower configuration
- Do not install on SL585, SL595, or other operators unless the parts diagram confirms the exact part number
- High-voltage electrical work should be performed by a qualified gate technician
- Do not bypass monitored entrapment protection or safety devices during electrical service
Professional Advisory
E-box replacement involves high-voltage wiring and operator safety circuits. Use a qualified gate technician, then test open, close, stop, limits, safety inputs, and any access-control accessories before returning the gate to service.
Product Questions & Answers
What operator is K-SL5755021G3 used with?
It is used with select LiftMaster SL575 Series slide gate operators that match the 230V, 1-phase, 1/2 HP configuration.
Why do voltage and phase matter on an E-box?
The internal power components and wiring layout are built for a specific electrical supply. Using the wrong configuration can damage the operator and create unsafe conditions.
Can this E-box replace another SL575 E-box with a different number?
Not automatically. SL575 E-box numbers are split by voltage, phase, and horsepower. Match the exact part number or parts diagram.
Should accessories be reconnected the same way after replacement?
Accessory wiring should be reviewed and reconnected according to the operator wiring diagram. Damaged accessories or shorts should be corrected first.
Who should install an SL575 E-box?
A qualified gate technician or electrical professional should handle E-box replacement because it involves high-voltage power and safety circuits.
