Square D QOB380 - 80 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB380 — an 80A, 240V, 3-pole bolt-on molded-case circuit breaker designed for dependable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters. This unit is a precise fit for residential, commercial, and light industrial electrical systems, delivering reliable protection where it matters most.

Secure bolt-on mounting for a rock-solid connection

Engineered with a secure bolt-on mounting system, the QOB380 establishes a rigid, vibration-resistant bus connection. This reduces the risk of loose contacts and intermittent trips in panels subjected to vibration, door closures, or dense wiring bundles—keeping your distribution path steady and dependable.

Thermal-magnetic protection you can rely on

The built-in thermal-magnetic trip unit provides stable, repeatable protection across varying temperatures and load conditions. You’ll experience fast, consistent response to short circuits while minimizing nuisance trips during normal startup surges, helping to protect both equipment and loads.

OEM-compatible for straightforward panel upgrades

Designed to pair with matching Square D OEM load centers and panelboards, this breaker ensures a clean fit, predictable trip behavior, and seamless integration into existing Square D systems. Compatibility means fewer surprises during installation and easier maintenance over time.

Ideal use cases

• Residential panel upgrades and service improvements that require robust 80A protection in a 240V system.
• Commercial distribution boards handling lighting, receptacles, and small machinery with reliable overcurrent protection.
• Light industrial panels needing durable, consistent trip characteristics for motors and HVAC circuits.

Key specifications

• Manufacturer: Square D
• Part number: QOB380
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 80 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

When you’re building or upgrading an electrical distribution system, reliability and compatibility matter. The QOB380 from Square D delivers precise protection for demanding panel configurations, backed by a design that minimizes disturbance to your panel’s integrity. Available from AmpState, it’s a practical, mission-critical choice for safe, efficient power distribution.