Square D QOB3125VH - 125 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB3125VH is a 125A, 240V, 3-pole bolt-on molded case circuit breaker designed to protect panelboards and load centers from overcurrent and short circuits. Crafted by Square D, this dependable unit combines a secure bolt-on mounting with a precise thermal-magnetic trip system to deliver reliable protection in demanding environments.

Why this breaker stands out

• Secure bolt-on mounting: A rigid, vibration-resistant bus connection that stays aligned through equipment motion and long conduit runs, helping to prevent connection drift and nuisance trips.
• Thermal-magnetic trip unit: Provides stable, repeatable protection by combining fast magnetic trips for short circuits with thermal protection for sustained overloads, maintaining consistent performance across temperature changes.
• OEM panel compatibility: Engineered for seamless drop-in fit with matching Square D OEM load centers and panelboards, ensuring clean labeling and integrated protection schemes.
• Versatile application: Suitable for residential, commercial, and light industrial installations where dependable branch-circuit protection is essential.

Technical specifications

• Manufacturer: Square D
• Part Number: QOB3125VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 125 A
• Voltage: 240 V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

Upgrade or install panelboard protection for feeders and downstream circuits in homes with elevated electrical loads (think multiple HVAC units, electric water heating, or high-demand appliances). In commercial spaces, protect motor circuits, lighting feeders, and small industrial setups where compact, reliable protection is critical. The 3-pole configuration provides balanced protection for 3-phase systems or three-wire feeds, delivering consistent performance in real-world conditions.

Installation and compatibility tips

Pair the QOB3125VH with Square D load centers designed for bolt-on molded-case breakers. Verify panel compatibility and ensure the enclosure supports bolt-on devices. Adhere to local electrical codes and refer to the panel manufacturer's torque specifications to maintain a secure, compliant installation. This unit is purpose-built to slot into compatible systems, delivering predictable protection and long-term reliability.