The ABB THQL2120 is a Q-Line plug-in circuit breaker designed for residential and commercial applications. It features a compact, one-inch wide per pole design with Quick-make / Quick-break mechanisms and common trip bars for enhanced safety and reliability. This 2-pole breaker offers easy-to-spot trip indication and is suitable for HID applications..The ABB THQL2120 is a 2-pole, 20 Amp circuit breaker from the Q-Line series. It operates at system voltages of 120 Vac and 120/240 Vac, with an interrupting rating of 10 KAIC at both voltages. This thermal-magnetic device has a non-interchangeable trip style with fixed long time and instantaneous trip functions. It is HACR marked and GSA compliant.