QO2DTI – SQUARE D GENERATOR INTER LOCK

The SQDQO2DTI is a mechanical interlock that mounts on your Square D QO loadcentre panel cover. It physically prevents your main breaker and your generator inlet breaker from being switched on at the same time. This is critical for safety: without an interlock, a generator could backfeed live voltage onto the utility lines, creating a serious electrocution hazard for hydro workers restoring power. It also protects your generator and home wiring from damage. Many Canadian electrical codes and inspectors require an approved interlock or transfer switch for any generator hookup.

Interlock kits used in Canada must comply with the Canadian Electrical Code (CEC), and the installation is typically subject to a permit and inspection by your local authority having jurisdiction (AHJ). The SQDQO2DTI is a Square D-branded, manufacturer-approved accessory for QO panels, which supports code-compliant installations. We recommend confirming acceptance with your local electrical inspector or licensed electrician before installation, as requirements can vary by province and municipality.

While the interlock kit itself is designed for straightforward installation on compatible Square D QO loadcentres, working inside an energized electrical panel is inherently dangerous. In most Canadian provinces, generator interlock installations require an electrical permit and must be performed or supervised by a licensed electrician. We strongly recommend hiring a qualified electrician to ensure safe, code-compliant installation. If you have questions about compatible breakers or accessories needed for your setup, our team is happy to help — contact your nearest Northern Breaker Group counter in Calgary, Edmonton, or Vancouver.