General Electric THHQB2120GFT2 Ground Fault Circuit Breaker

This Q-Line bolt-on breaker is designed for use in GE and ABB ReliaGear lighting panels, as well as legacy GE A-Series (AQ and AL) panelboards that accept bolt-on THHQB breakers. It will not fit in standard plug-on residential load centers.

The GFT2 suffix designates this as a Class A Ground Fault Circuit Interrupter (GFCI) for personnel protection. It is calibrated to trip when it detects ground fault leakage currents of 5mA or greater, protecting users from severe electrical shock.

The primary difference is the interrupting capacity. The THQB2120GFT2 is rated for 10kAIC, whereas the THHQB2120GFT2 has a higher 22kAIC rating. The THHQB version must be used in systems where the available fault current exceeds 10,000 amps.

The GFT2 model is a Class A GFCI designed for personnel protection with a 5mA trip threshold. The GFEP2 model is designed for Equipment Ground Fault Protection (EGFP) and has a higher 30mA trip threshold to prevent nuisance tripping on equipment that naturally leaks minor current.

This is a bolt-on circuit breaker. It fastens directly to the panelboard bus bars using screws, providing a secure, vibration-resistant mechanical and electrical connection suitable for commercial applications.

Yes, this 2-pole breaker incorporates an internal common trip mechanism. If an overload, short circuit, or ground fault occurs on either leg, both poles will open simultaneously to prevent single-phasing of 240V equipment.

Yes, GE and ABB GFCI breakers with the T2 suffix feature an automatic self-test function. This internal diagnostic periodically verifies that the ground fault detection circuitry is operational, complying with UL 943 standards.

Yes. To power the internal ground fault detection circuitry, the attached white neutral pigtail wire must be connected directly to the panel neutral bus bar during installation.

The 22,000 Ampere Interrupting Capacity (22kAIC) indicates the maximum short-circuit fault current the breaker can safely clear without sustaining catastrophic damage. This higher rating is typically required in commercial facilities or panels located close to the main service entrance.