The LiftMaster K-SL5851043G3 E-Box is a replacement electrical control box assembly for a specific SL585 industrial slide gate operator configuration. On an industrial slide gate operator, the E-box is the protected control area that brings together the operator controls, line-voltage power handling, terminal connections, and related electrical hardware needed for normal gate operation. When the original electrical box is damaged, corroded, burned, water-intruded, or no longer serviceable, replacing the complete matching E-box can be a cleaner repair than trying to rebuild several mismatched electrical components one at a time.
This is not a universal SL-series control box. LiftMaster built the SL580, SL585, and SL595 families in multiple voltage, phase, horsepower, and generation combinations. A box for 460V, 3PH, 1 HP service should stay with that same operator configuration unless the manufacturer parts diagram confirms otherwise. The correct E-box helps keep the motor control circuit, accessory terminals, safety-device wiring, overload protection, and service layout matched to the operator it was designed to run.
Common replacement reasons include damaged contactor or relay area, failed transformer or line-voltage components, moisture damage inside the enclosure, burned wiring from a power event, missing terminal hardware, or a previous repair that left the electrical box unsafe or unreliable. Before replacing the assembly, the gate system should be inspected for root causes such as water entry, surge damage, incorrect incoming voltage, shorted accessory wiring, damaged conduit, or a motor problem that may damage the new box if left unresolved.
SL585 electrical boxes are not universal. A 115V 1-phase box, 208V 1-phase box, 230V 1-phase box, 230V 3-phase box, 460V 3-phase box, and 575V 3-phase box can all belong to the SL585 family but use different internal electrical components. Match the original nameplate, incoming power, motor horsepower, and parts diagram before ordering.
| Feature / Specification | Details |
|---|---|
| Manufacturer | LiftMaster |
| Product Type | E-Box / Electrical Control Box Replacement Kit |
| Part Number | K-SL5851043G3 |
| Operator Family | SL585 G3 |
| Application | SL585 industrial slide gate operator electrical box replacement |
| Motor Rating | 1 HP |
| Voltage | 460V |
| Phase | 3PH |
| Control Generation | G3 |
| Compatible Operator Type | Commercial / industrial vehicular slide gate operator |
| Notes | Match by original E-box part number, operator nameplate, voltage, phase, horsepower, and parts diagram. |
The following part numbers and search variations are commonly associated with this item or its operator configuration. Treat related numbers as verification aids, not automatic substitutes.
Before replacing the E-box, compare the new assembly to the original box while the power is safely disconnected by a qualified technician. Confirm the voltage label, phase, horsepower, terminal designations, harness plugs, safety input wiring, accessory wiring, and grounding. If the original E-box failed from a short, surge, water intrusion, or motor fault, correct that issue before energizing the replacement.
This part is connected to high-voltage operator wiring and gate safety circuits. Installation and troubleshooting should be performed by a qualified gate technician. Do not bypass monitored photo eyes, edge sensors, warning devices, overloads, or other required safety equipment to make an operator run.
The K-SL5851043G3 is a LiftMaster replacement E-box assembly used as the electrical control box for select SL585 industrial slide gate operator configurations. It houses the main control and power-management components for the matching operator setup.
No. SL585 operators were built in different voltage, phase, horsepower, and generation configurations. This part should be matched to the original E-box part number, operator nameplate, and parts diagram before ordering.
The E-box is built around a specific electrical configuration. A 460V, 3PH, 1 HP setup can use different transformers, contactors, overload protection, wiring, and terminal layout than another version of the same operator family.
Because an E-box connects to line voltage and gate safety circuits, replacement should be handled by a qualified gate technician. Do not bypass monitored safety devices, warning devices, overloads, or required protection circuits.
Check the operator model tag, original E-box number, voltage, phase, horsepower, control generation, enclosure layout, harness connections, and the LiftMaster parts diagram. Also inspect for water intrusion or damaged field wiring that may have caused the original failure.