The ABB THQB2150 is a compact, thermal-magnetic Q-Line circuit breaker designed for reliable performance in residential and commercial applications. Featuring a Quick-make / Quick-break mechanism and common trip bars, this 2-pole breaker ensures safety and ease of use with its easily visible trip indication. It is suitable for bolt-on mounting to the bus connections of load centers and lighting panels and is also rated for HACR applications..The ABB THQB2150 is a 2-pole, 50 Amp circuit breaker with a 10 KAIC interrupting rating at 120/240 Vac. It utilizes a thermal-magnetic trip technology with fixed long-time and instantaneous trip functions. This bolt-on breaker is designed for use with 120/240 Vac systems and is suitable for reverse feed applications. It is marked for HACR use and is GSA compliant.