ABB / General Electric THQL32090ST1 Miniature Circuit Breaker

The ST1 suffix indicates that this breaker includes a factory-installed 120VAC shunt trip accessory. This allows the breaker to be tripped remotely, which is commonly used for emergency shutdown applications.

This plug-in breaker is compatible with three-phase GE PowerMark Gold load centers and GE AQ lighting panels. It requires three standard 1-inch spaces on the panel busbar.

No. Because it is a 3-pole breaker, it is designed exclusively for three-phase commercial or industrial panels. It cannot be used in a standard single-phase residential load center.

Yes, the THQL32090ST1 is fully HACR rated. This makes it approved for safely protecting heating, air conditioning, and refrigeration circuits.

The internal common trip ensures that if an overload or short circuit occurs on any single phase, all three poles will open simultaneously. This prevents single-phasing and protects connected three-phase motors or equipment.

The thermal-magnetic mechanism provides fixed Long-Time (L) protection for sustained overloads and fixed Instantaneous (I) protection to rapidly clear short circuits.

The terminals accept 6 AWG to 1/0 AWG copper conductors, or 4 AWG to 1/0 AWG aluminum conductors. Always ensure the connections are torqued to the manufacturer specifications printed on the breaker label.