Square D QOB245 - 45 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB245 — a 45A, 240V, 2-pole bolt-on molded case circuit breaker crafted for reliable branch-circuit protection in panelboards and load centers. Built to endure in demanding environments, this device delivers a secure, vibration-resistant connection that stays true under movement and duty cycles.

Why this model stands out

• Bolt-on mounting for a rigid bus connection: Designed to stay firmly in place, reducing the risk of loose connections and electrical noise in busy electrical rooms.
• Thermal-magnetic trip unit: Combines precise thermal sensing with rapid magnetic trip action for stable, repeatable protection against both overloads and short circuits.
• OEM-compatible: Specifically engineered to integrate with matching Square D load centers and panelboards, ensuring a seamless fit and dependable performance.
• Versatile protection: Ideal for residential, commercial, and light industrial applications where a 2-pole, 240V solution is required to guard two hot conductors and the shared neutral where applicable.

Ideal use cases

• Feeding and protecting branch circuits in residential panelboards and subpanels requiring 240V two-pole protection.
• retrofit or replacement projects where a bolt-on, molded case breaker is preferred for robust, vibration-resistant service.
• Small to mid-size commercial or light industrial installations that demand reliable short-circuit protection alongside solid thermal overload protection.

Technical details at a glance

• Manufacturer: Square D
• Part number: QOB245
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 45A
• Voltage rating: 240V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical installation insights

Choose the QOB245 when you need a compact, dependable 2-pole solution that locks securely into compatible panelboards. Ensure your panel is rated for bolt-on breakers and that the overall load aligns with the 45A protection level. When installing, tighten mounting screws to the manufacturer’s recommended torque to maintain the integrity of the bus connection and minimize any potential vibration-related wear over time.

Why choose this for your electrical panel?

Compared to other 2-pole breakers, the QOB245’s bolt-on design and thermal-magnetic trip unit provide a precise balance of secure mounting and reliable protection. It’s specifically aligned with OEM load centers, reducing compatibility concerns and helping you achieve consistent protection across your distribution system. For contractors and facility managers, this means fewer field adjustments, quicker installations, and dependable performance in residential, commercial, and light industrial settings.

Ready for dependable protection in your next panel project? The Square D QOB245 is available from AmpState, delivering a robust, proven solution for 45A, 240V, 2-pole bolt-on circuit protection.