Square D QBM32150TN - 150 A, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable branch circuit overcurrent and short-circuit protection, the Square D QBM32150TN is a 150 A, 3-pole bolt-on molded case circuit breaker designed to anchor reliability in panelboards and load centers.

Its thermal-magnetic trip unit combines precise thermal response with fast magnetic protection, delivering stable, repeatable performance as electrical loads fluctuate, helping prevent nuisance trips while guarding circuits against short circuits.

With secure bolt-on mounting, this unit creates a rigid, vibration-resistant bus connection that stands up to the demands of residential, commercial, and light industrial installations.

Designed to work with matching OEM load centers and panelboards, the QBM32150TN ensures proper fit, consistent electrical contact, and straightforward replacement when you upgrade or service your distribution panel.

Ideal for 3-phase distribution where reliability matters, this 150 A, 3-pole breaker handles demanding load profiles in panelboards and load centers, offering strong protection right at the source.

Key features

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus bar, reducing movement that can compromise protection.
• Thermal-magnetic trip unit delivers stable protection with repeatable trip behavior across varying temperatures and loads.
• 3-pole configuration supports 3-phase circuits commonly found in commercial and light-industrial systems.
• OEM compatibility ensures seamless integration with matching Square D load centers and panelboards for reliable performance.
• Versatile applications suitable for residential, commercial, and light industrial environments.

Technical specifications

• Manufacturer: Square D
• Part Number: QBM32150TN
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 150 A
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical guidance for installation and use

• Before installation, verify compatibility with your OEM panelboard and the overall system ratings. The QBM32150TN is designed to align with Square D panelboards and load centers for a secure fit and dependable contact.

• Use the proper mounting hardware and torque per manufacturer guidelines to maintain a solid bus connection and fill any mounting lugs per panel specifications.

• Plan for the expected load profile in your service distribution. The 150 A rating is well-suited for main feeders or protective separation in panels serving medium-duty circuits within residential, commercial, or light industrial settings.

• For service and maintenance, keep the panel accessible and label circuits clearly to facilitate quick shutdowns and safe testing when protection device replacement is needed.