General Electrics THHQB32040ST1 - 40 A, 3-Pole Bolt-On Circuit Breaker | AmpState

The General Electrics THHQB32040ST1 is a purpose-built solution for reliable protection of three-phase branch circuits in panelboards and load centers. With a 40 A rating and a 3-pole bolt-on design, this molded case circuit breaker delivers dependable overcurrent and short-circuit defense where it matters most—without sacrificing performance or compatibility.

why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus bars, helping maintain consistent electrical contact in environments subject to movement or vibration.
• Thermal-magnetic trip unit combines precise thermal sensing with magnetic trip action for stable, repeatable protection across a range of fault conditions, reducing nuisance trips while safeguarding equipment.
• Three-pole architecture is ideal for 3-phase circuits common in commercial and light-industrial applications, supporting balanced protection across all phases.
• OEM-ready compatibility is designed to pair with matching General Electrics OEM load centers and panelboards, ensuring a seamless fit and consistent protection performance.
• Molded-case reliability delivers durable, long-term protection for residential, commercial, and light-industrial installations where dependable circuit interruption is critical.

ideal applications and use cases

• Protection for 3-phase industrial equipment, HVAC systems, and commercial lighting where a robust, bolt-on breaker is preferred for retrofit or new installations.
• Replacement or upgrade in panelboards and load centers that require a precise 40 A, 3-pole thermal-magnetic solution with OEM compatibility.
• Situations demanding secure mounting to resist vibration and maintain stable electrical performance over time.

technical snapshot

• Manufacturer: General Electrics
• Part Number: THHQB32040ST1
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

why it matters for your project

Choosing the THHQB32040ST1 means more than just a part replacement—it’s a designed-in safeguard that supports reliable operation of your electrical system. The combination of a secure bolt-on connection and a responsive thermal-magnetic trip unit minimizes downtime and protects sensitive equipment from damaging faults. Its compatibility with matched OEM panelboards ensures you’re not compromising protection or performance when expanding or upgrading your electrical install.

Whether you’re outfitting a small commercial space, a light-industrial facility, or upgrading a residential panelboard with 3-phase capability, the General Electrics THHQB32040ST1 offers steady, predictable protection that electricians and facility managers can trust. For a focused, high-fidelity protection solution in a bolt-on format, this 40 A, 3-pole circuit breaker from AmpState is designed to perform when it matters most.