Generator Interlock Switch

Electrical safety devices for generator and utility power isolation.

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Interlock

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Introduction

Generator interlock switches prevent simultaneous connection of standby power and utility lines, protecting linemen and equipment.

  • Mechanical slide plates physically block the main breaker when the generator breaker is engaged, eliminating accidental back-feed.
  • Heavy-gauge steel construction withstands repeated operation and panel vibration without deformation.
  • Clear labeling and padlock provisions support compliance with local electrical codes and insurance requirements.

Confirm panel model compatibility before installation to ensure proper fit.

FAQs

Most jurisdictions require a licensed electrician to install and inspect interlock devices to meet code and maintain warranties.

Sizing depends on the breaker amperage in your panel; the interlock must match that rating, not the generator output.

Interlocks are designed for the service entrance panel; sub-panel setups usually need a transfer switch instead.

With utility power off, attempt to turn on both main and generator breakers; only one should move at a time.

Slide plates and labels can be ordered individually if damaged, but full re-installation inspection is still advised.