ABB / General Electric TMQL21100 Molded Case Circuit Breaker

It is designed as a tenant main circuit breaker for GE Meter Mod III modular metering stacks, specifically fitting 125A meter sockets.

Both share the same physical 1-inch per pole frame size, but the TMQL21100 features a much higher interrupting rating of 42kAIC at 240V, compared to the standard 10kAIC of a THQL breaker. The TMQL is specifically rated for use in Meter Mod III metering equipment.

ABB acquired GE Industrial Solutions in 2018. As a result, Q-Line breakers like the TMQL21100 are transitioning to ABB branding. The form, fit, and function remain identical regardless of the logo on the label.

The 42,000 Ampere Interrupting Capacity (AIC) indicates the maximum fault current the breaker can safely clear at 240V. In Meter Mod III stacks, this high rating allows it to protect downstream load center breakers that may only have a 10kAIC rating, provided they are part of an approved series rating.

While it shares the THQL plug-on frame, the TMQL series is specifically listed for use in GE Meter Mod III modular metering stacks as a tenant main. Always verify the panel labeling for approved breaker types before installing it in a standard residential load center.

No, the TMQL21100 is a standard thermal-magnetic circuit breaker providing overload and short-circuit protection. It does not include Ground Fault (GFCI) or Arc Fault (AFCI) circuitry.

It utilizes a plug-on mounting style that snaps directly into the bus connections of the GE Meter Mod III tenant main compartment, requiring no bolted connections to the bus.

Yes, standard GE Q-Line thermal-magnetic breakers like the TMQL21100 are suitable for reverse feed applications unless marked with Line and Load designations on the breaker face.