ABB / General Electric THHQB2120GFT GFCI Molded Case Circuit Breaker

Yes. The THHQB2120GFT has a higher interrupting rating of 22kAIC compared to the standard THQB2120GFT, which is rated at 10kAIC. They share the same physical dimensions and bolt-on mounting, making the THHQB a direct, upgraded replacement where higher fault current protection is required.

No. The THHQB2120GFT is a bolt-on circuit breaker designed specifically for commercial GE A-Series and ReliaGear RQ panelboards. Standard GE residential load centers require plug-in style breakers, such as the THQL series.

It provides Class A personnel-level ground fault protection, which trips at a 5mA leakage threshold. The GFT suffix also indicates that the breaker includes an automatic self-test feature to continuously verify the integrity of the ground fault circuitry.

This breaker is equipped with a pigtail neutral wire that must be connected directly to the panelboard neutral bus. Additionally, the load neutral conductor must be terminated directly on the breaker to ensure proper ground fault sensing.

No. Following ABB's acquisition of GE Industrial Solutions, these breakers may be labeled under either the ABB or General Electric brand. The form, fit, function, and internal components remain identical regardless of the logo on the label.

LIG stands for Long-Time, Instantaneous, and Ground-Fault. The Long-Time function provides thermal protection against overloads, the Instantaneous function provides magnetic protection against short circuits, and the Ground-Fault function protects personnel from earth leakage currents.