Square D QOB370 - 70 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Square D QOB370 — a 70A, 240V, 3-pole bolt-on molded case circuit breaker designed to protect branch circuits from overcurrent and short circuits in panelboards and loadcenters. Built to withstand the demands of residential, commercial, and light industrial environments, this unit delivers robust protection and dependable performance when every amp matters.

• Secure bolt-on mounting: Provides a rigid, vibration-resistant connection to the bus, reducing the risk of loose contacts and intermittent trips.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection across temperature variations and responds quickly to short circuits.
• 3-pole, 240V design: Ideal for multi-phase circuits and feeders that require reliable protection at standard commercial voltages.
• Molded case construction: Durable housing designed to withstand panelboard environments and assist with heat dissipation.
• OEM load center compatibility: Matches Square D load centers and panelboards for a clean, guaranteed fit and performance.
• Versatile applications: Suitable for residential, commercial, and light industrial panelboards and loadcenters—great for main service panels or subpanels.

Use cases include upgrading existing panels, replacing failed breakers, or provisioning a dedicated 70-amp feeder for heavy loads like pumps, HVAC equipment, or large circuit feeders. The QOB370’s 3-pole configuration ensures coordinated tripping across all phases, protecting downstream equipment and wiring from fault conditions.

• Manufacturer: Square D
• Part number: QOB370
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 70 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

With its combination of secure mounting, precise protection, and OEM compatibility, the Square D QOB370 is a dependable choice for engineers, electricians, and specifiers seeking durable, code-compliant protection for critical electrical distribution systems. Available through AmpState for quick sourcing and reliable logistics.