Square D Q1B245 45A 2P 240V Circuit Breaker, Bolt-On | AmpState

Meet the Square D Q1B245, a purpose-built 2-pole, 45 A, 240 V bolt-on circuit breaker designed to shield panelboards, load centers, and electrical distributions from overloads and faults. Built for retrofit work and maintenance planning, this part keeps your service strategy simple by preserving the exact part number you rely on.

Why choose the Square D Q1B245?

• Bolt-on mounting for secure, straightforward installation in compatible Square D panels—reducing field time and ensuring solid electrical connections.
• 2-pole, 240 V configuration provides robust protection for dual‑phase circuits commonly found in commercial and industrial settings.
• 45 A rating suits a wide range of branch circuits and motor-start applications, delivering reliable protection where it matters most.
• Part-number stability ideal for retrofits and service planning—maintain consistent inventory and reduce downtime when replacing worn or failed protection devices.
• AmpState availability ensures a dependable source for this specific model, making replacements and stocking straightforward.

Ideal use cases

• Retrofit projects where you must keep the exact part number for compatibility with existing panels and replacement parts.
• Maintenance planning for facilities that rely on Square D protection devices and want consistent spares.
• Electrical distribution setups that require reliable 2-pole, 240 V protection for dual‑phase circuits.

Specifications at a glance

• Manufacturer: Square D
• Part Number: Q1B245
• Product Type: Circuit Breaker
• Amperage: 45 A
• Poles: 2
• Voltage: 240 V
• Mounting: Bolt-On
• Applications: Panelboards, Load Centers, Electrical Distribution

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.