ABB / General Electric THQL2150ST1 Miniature Circuit Breaker

This plug-on breaker is designed for use in GE PowerMark Gold load centers and GE A-Series panelboards that accept 1-inch THQL series breakers.

The ST1 suffix means this breaker is equipped with a factory-installed 120V shunt trip mechanism. This allows the breaker to be tripped remotely for emergency shutdowns or automated control systems.

ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the THQL2150ST1 may be branded as either ABB or GE, but the physical breaker, fit, and function remain identical.

The 120V shunt trip mechanism includes a pigtail wire that connects to your external control circuit, allowing a remote voltage signal to open the breaker contacts.

No. THQL breakers are plug-on style, while THQB breakers are bolt-on style typically used in commercial lighting panels. They are not interchangeable.

As a 2-pole Q-Line breaker, it requires two standard 1-inch spaces in a compatible GE load center.

The shunt trip allows for remote disconnection of power. It is commonly used to tie the breaker into fire alarm systems, emergency stop buttons, or other automated safety controls that require immediate circuit de-energization.

The LI designation indicates the breaker uses a thermal magnetic trip unit with Long-Time (thermal) protection for overloads and Instantaneous (magnetic) protection for short circuits.

No. This is a standard thermal magnetic breaker providing overload and short-circuit protection. It does not include ground fault or arc fault protection.