ABB / General Electric THHQB1140 Miniature Circuit Breaker

This bolt-on breaker is designed exclusively for use in GE A-Series Panelboards and ReliaGear RQ Panelboards.

Both are 40A, 1-pole, bolt-on circuit breakers for GE A-Series and ReliaGear RQ panels. The THQB1140 has a standard interrupting rating of 10kAIC, while the THHQB1140 features a higher interrupting rating of 22kAIC for systems with higher available fault current.

No. The THHQB1140 utilizes a bolt-on connection required for commercial panelboards like the GE A-Series. Plug-in THHQL breakers are designed for residential load centers and will not mount to a bolt-on bus.

The box lugs on this breaker accept 8 AWG to 3 AWG wire. The terminals are rated for both copper (Cu) and aluminum (Al) conductors.

The fixed thermal magnetic trip unit includes Long-Time (L) and Instantaneous (I) functions. The thermal element provides long-time delay protection against sustained overloads, while the magnetic element provides instantaneous tripping to clear short circuits.

It is part of the GE Q-Line family and uses the THQB frame type. This compact, 1-inch wide per pole frame is standard for GE bolt-on miniature circuit breakers.

ABB acquired GE Industrial Solutions. Depending on the manufacturing date, the THHQB1140 may feature either GE or ABB branding, but the breaker design, specifications, and panel compatibility remain identical.