ABB / General Electric THQLT2020 20/20A Tandem Miniature Circuit Breaker

The THQLT is a standard 1-inch wide tandem breaker that houses two circuits and connects to regular 1-inch bus stabs. A THQP breaker is a 1/2-inch slim design that requires special perpendicular bus stabs found only in certain slots of GE panels.

Yes. It is fully backwards compatible with existing single-phase GE PowerMark load centers, as well as current ABB Reliahome panels. It fits into standard 1-inch breaker spaces, even if the panel does not accept 1/2-inch THQP breakers.

No. Because both circuits inside the tandem housing connect to the exact same phase leg on the panel bus bar, there is zero voltage potential between them. It can only supply two independent 120V circuits.

No. You cannot use a tandem breaker for circuits sharing a neutral wire. Since both internal circuits pull from the same phase, the return current would stack on the shared neutral wire and potentially overload it, creating a severe fire hazard.

No. The THQLT2020 features independent thermal-magnetic trip units. An overload or fault on one 20A circuit will cause that specific circuit to trip without shutting off power to the adjacent circuit.

The box lugs on this breaker require a tightening torque of 25 lb-in. Ensure connections are properly secured using a calibrated torque tool to prevent dangerous arcing.

Yes. This breaker serves as a direct functional replacement for the THQLT2020A, allowing you to easily expand circuit capacity in populated single-phase enclosures.