ABB / General Electric THHQB21100 Molded Case Circuit Breaker

No. The THHQB21100 is a bolt-on circuit breaker designed for commercial GE A-Series and AQ lighting panels. Standard GE residential load centers require plug-on breakers like the THQL or THHQL series.

This breaker is designed for use in GE A-Series panelboards, GE AQ Lighting Panels, and ABB ReliaGear Merchandised lighting panelboards that accept bolt-on Q-Line breakers.

The difference is the short circuit interrupting rating. The THQB21100 has a standard 10kAIC rating, while the THHQB21100 features a higher 22kAIC rating. Both share the same physical dimensions and bolt-on mounting style.

Yes. ABB acquired GE Industrial Solutions, so newly manufactured ABB THHQB21100 breakers are identical in form, fit, and function to legacy General Electric versions and will mount in the same panels.

For the box lugs on this breaker, the recommended tightening torque is 50 in-lb when using 3 AWG to 1/0 AWG copper or aluminum wire. For 6 AWG to 4 AWG wire, torque to 45 in-lb.

Yes, this Q-Line miniature circuit breaker carries HACR special markings, making it suitable for protecting heating, air conditioning, and refrigeration equipment circuits.

Yes, the THHQB21100 features an internal common trip mechanism. If one pole trips under an overload or fault condition, the internal linkage ensures the second pole will simultaneously disconnect.