ABB / General Electric THQL1120GFT GFCI Miniature Circuit Breaker

The THQL1120GFT is the direct replacement for the legacy THQL1120GF. The 'T' indicates the addition of an automatic self-test feature, which complies with updated UL 943 standards for ground fault circuit interrupters.

This breaker provides Class A ground fault protection with a 5mA trip threshold. It is designed for personnel protection in wet or damp locations, such as kitchens, bathrooms, and outdoor circuits, as required by the NEC.

The THQL1120GFT features a pigtail neutral connection. The attached coiled white wire must be terminated at the panel's neutral bus bar for the ground fault circuitry to operate correctly.

ABB acquired GE Industrial Solutions in 2018. Q-Line breakers are currently manufactured under the ABB ReliaHome name. The THQL1120GFT remains identical in physical design and electrical specifications, and is fully backward compatible with existing GE load centers.

Although the THQL1120GFT performs continuous internal self-testing, the manufacturer recommends pressing the test button monthly to verify mechanical operation. A successful test will trip the breaker, requiring it to be toggled fully off before resetting.

Yes, this 1-inch plug-in breaker is fully compatible with legacy GE PowerMark Gold load centers, as well as GE A-Series panelboards, AQ Lighting Panels, and modern ABB ReliaHome enclosures.