Step1: Turn off power at main supply and verify no voltage using tester.
Step2: Remove front panel carefully and disconnect old switch wiring noting terminal positions clearly.
Step3: Mount new rocker switch securely into the panel opening and align correctly.
Step4: Reconnect wires to matching terminals per wiring diagram or original configuration.
Step5: Reassemble panel, tighten fasteners, restore power, and test switch operation.
Step6: Safety avoid live circuits, ensure proper insulation, and confirm secure grounding.