The ABB THQB2120 is a Q-Line miniature circuit breaker designed for reliable protection in residential and commercial applications. This 2-pole, 20A breaker features a compact, one-inch wide per pole design and is a bolt-on version for easy installation in load centers and lighting panels. It incorporates Quick-make / Quick-break mechanisms, common trip bars, and clear trip indication for enhanced safety and dependable operation. The THQB2120 is suitable for HACR applications and offers a 10 KAIC interrupting rating at 120/240 Vac..The ABB THQB2120 is a 2-pole, 20 Amp miniature circuit breaker from the Q-Line series. It operates with a system voltage of 120 Vac and 120/240 Vac, featuring a fixed long time and fixed instantaneous trip function. The breaker has an interrupting rating of 10 KAIC at 120 Vac and 10 KAIC at 120/240 Vac. It is suitable for reverse feed and HACR applications. The wire range for copper and aluminum is 14-8 kcmil / 12-8 kcmil. The dimensions are 3.280 inches in height, 2.000 inches in width, and 2.375 inches in depth, with a weight of 0.740 lb. It is a thermal-magnetic device with a non-interchangeable trip style and Q-Line frame type.