ABB / General Electric THQB1120AF2 AFCI Miniature Circuit Breaker

This bolt-on breaker is designed exclusively for GE A-Series panelboards and GE AQ lighting panels. It requires a bolt-on chassis and cannot be used in standard residential load centers that require plug-in breakers.

The AF2 designation indicates the breaker is a Combination Arc Fault Circuit Interrupter. It detects both series and parallel arcing faults to meet current NEC arc-fault protection requirements for habitable rooms.

Yes. Following corporate acquisitions, these breakers are manufactured under the combined ABB / GE brand. The part number, internal components, and bolt-on mounting specifications remain identical.

No. THQB series breakers use a bolt-on connection type for commercial and industrial panelboards. They will not physically fit in standard GE load centers that require THQL plug-in breakers.

The THQB1120AF2 features a coiled white pigtail wire. This wire must be routed and secured directly to the panelboard neutral bus bar to power the internal electronic arc fault detection circuitry.

The thermal-magnetic trip unit handles standard overload and short-circuit conditions. The electronic AFCI component monitors the circuit for dangerous arcing faults, such as those caused by damaged wire insulation or pinched cords, isolating the circuit to prevent electrical fires.

LI stands for Long-Time and Instantaneous. The Long-Time thermal function protects the circuit against sustained low-level overloads, while the Instantaneous magnetic function trips the breaker immediately during high-current short circuits.

Yes. Like all AFCI breakers, it features a built-in test button. Electricians and maintenance personnel should use this button periodically to verify that the electronic arc fault detection circuitry is functioning correctly.