Square D QOB270 - 70 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Square D QOB270 is a 70A, 240V, 2-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for durability and consistent performance, this breaker is a smart choice when you need solid protection for 240V circuits in a variety of settings.

Key advantages that matter in real-world installations:

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain a dependable electrical path in panels subjected to movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by accurately responding to overloads and short circuits, reducing nuisance trips and ensuring safety for connected equipment.
• OEM-wide compatibility is designed to pair with matching Square D OEM load centers and panelboards, simplifying installation and ensuring cohesive performance.
• Versatile 2-pole design disconnects both hot legs on 240V circuits, enhancing safety and reliability for multi-wire circuits in residential, commercial, and light industrial applications.

Technical specifications

• Manufacturer: Square D
• Part Number: QOB270
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70A
• Voltage Rating: 240V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical deployment

Best suited for residential panel upgrades, commercial panels, and light industrial installations where 240V circuits require robust protection. Use the QOB270 to safeguard heating, cooling equipment, pumps, motors, and other high-demand loads that rely on reliable, synchronized disconnection in the event of an electrical fault. Its bolt-on design simplifies field installation in panels that support this mounting style, delivering a secure connection even in environments with vibration or movement.

What makes this breaker stand out

If you’re weighing options for panel compatibility and long-term reliability, the QOB270 offers a precise combination of secure mounting, predictable thermal-magnetic protection, and seamless integration with Square D load centers. This isn’t just a generic protective device—it’s built to integrate with your existing Square D ecosystem, streamline installation, and provide dependable protection for 240V branch circuits across a range of applications.