ABB / General Electric THQB32020ST1 Miniature Circuit Breaker

The ST1 suffix signifies that this breaker includes a factory-installed 120VAC shunt trip accessory. This feature allows the breaker to be tripped remotely, which is often required for emergency shutdown systems or equipment interlocks.

This unit is engineered specifically for GE A-Series panelboards and GE AQ lighting panels. It utilizes a bolt-on mounting mechanism that fastens directly to the panel bus, ensuring a highly secure electrical and mechanical connection.

The box lugs are rated to accept 14 to 8 AWG copper wire or 12 to 8 AWG aluminum wire. Always verify that the conductor size matches the load requirements and is torqued to the manufacturer specifications during installation.

Yes, this Q-Line breaker is HACR rated, making it approved for use with heating, air conditioning, and refrigeration equipment that requires this specific overcurrent protection rating.

ABB acquired GE Industrial Solutions in 2018. As a result, Q-Line breakers manufactured after the transition may feature ABB labeling. The physical dimensions, specifications, and performance remain identical regardless of the brand name on the label.

This breaker features an internal common trip mechanism. If an overcurrent or short circuit event occurs on any single phase, the internal trip bar ensures that all three poles open simultaneously, completely disconnecting power to the three-phase load.