ABB / General Electric THQL21WY30 Molded Case Circuit Breaker

The WY designates this as a switched neutral circuit breaker. It is designed to disconnect both the ungrounded hot conductor and the neutral conductor simultaneously when tripped or manually turned off.

Switched neutral breakers are typically required in environments where a neutral voltage could pose a shock or explosion hazard. Common applications include fuel dispensers, gas pumps, and specific generator or medical equipment installations where all conductors must be completely isolated.

As a 2-pole Q-Line breaker, it requires two standard 1-inch spaces in a compatible GE load center. One pole connects to the hot conductor, and the second pole provides the disconnect means for the neutral.

While this breaker is designed for GE PowerMark Gold load centers and GE AQ lighting panels, physical fit does not guarantee compatibility. You must check the interior label of your panelboard to confirm that THQL frame breakers are explicitly listed as an approved type for your specific enclosure.

No. The THQL21WY30 is a specialized switched neutral breaker for 120V circuits requiring neutral isolation. A standard THQL2130 is a conventional 2-pole breaker designed for 240V circuits with two hot legs. They serve different purposes and are not interchangeable.

ABB acquired the GE Industrial Solutions low-voltage business. As a result, this breaker may arrive branded as either GE or ABB. The THQL21WY30 catalog number, physical dimensions, and electrical specifications remain identical across both brands.

The LI designation indicates a fixed thermal-magnetic trip unit with Long-Time and Instantaneous protection. The thermal component responds to prolonged overloads, while the magnetic component reacts immediately to short circuits.