ABB / General Electric THQL21100 Miniature Circuit Breaker

The Q-Line THQL series features a standard 1-inch width per pole. Because the THQL21100 is a two pole breaker, it requires two adjacent 1-inch spaces in the load center.

Tightening torque depends on the wire gauge installed. Factory specifications require 45 in-lb of torque for 6 to 4 AWG conductors, and 50 in-lb of torque for 3 to 1/0 AWG conductors.

Yes, it can function as a back-fed main breaker in compatible GE or ABB main lug load centers. However, the National Electrical Code requires you to install an approved main breaker retainer kit, such as the THQLRK1 or THQLRK2, to ensure the breaker cannot be accidentally removed while energized.

Yes, this circuit breaker carries a Heating, Air Conditioning, and Refrigeration (HACR) rating. It is fully approved for protecting HVAC circuits that require a 100A overcurrent device.

This breaker features a central trip indication mechanism. When an overload or short circuit occurs, the handle snaps to a distinct middle position between on and off. You must push the handle fully to the off position before toggling it back on to reset the internal mechanism.

Yes. The THQL frame is the direct, modern equivalent to the legacy THQ line. A THQL21100 will physically fit and safely operate in existing GE load centers that originally specified a 100A two pole THQ breaker.