GE THQB32040ST1 40A 240V 3-Pole Bolt-On Circuit Breaker

The GE THQB32040ST1 is a 40-amp, 240-volt, 3-pole bolt-on molded case circuit breaker built for dependable branch circuit protection in panelboards and load centers. Engineered for reliability in residential, commercial, and light industrial installations, this unit delivers secure performance where it matters most—your electrical backbone.

Key benefits that set this breaker apart

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, minimizing movement and arcing risks in dynamic electrical environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overloads and short circuits, reducing nuisance trips while guarding sensitive circuits.
• Three-pole configuration ensures simultaneous disconnection for all lines in three-phase systems, enhancing safety and coordination across equipment.
• OEM compatibility designed to integrate with matching GE OEM load centers and panelboards for streamlined replacement and maintenance.
• Versatile applications ideal for residential feeders, commercial branch circuits, and light-industrial electrical arrays needing reliable overcurrent protection.

Technical specifications

• Manufacturer: GE
• Part Number: THQB32040ST1
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and practical insights

In a three-phase panel or load center, the THQB32040ST1 provides immediate, clear protection for motors, compressors, and other high inrush loads common in light industrial settings. It's well-suited for service entrances or subpanels where a rugged, bolt-on breaker is preferred for a secure, maintenance-friendly connection. If you’re upgrading an aging system or rebuilding a panel, this 3-pole 40A breaker ensures consistent trip performance aligned with GE’s design standards.

Why choose a bolt-on solution? Compared with clip-on or plug-in equivalents, bolt-on breakers tend to offer superior mechanical stability in environments with vibration or frequent door openings and rearrangements. The result is steadier protection, fewer contact issues, and smoother long-term operation in panelboard assemblies.

Pair this breaker with compatible GE load centers for a cohesive, guaranteed-fit replacement that maintains electrical code alignment and coordination across your distribution system. Whether you’re wiring a small commercial shop or a residential multi-circuit panel, the THQB32040ST1 delivers dependable protection you can count on day after day.