Square D QO190 90A 1-Pole 240 V Circuit Breaker

Protect large 240-volt circuits with precision using the Square D QO190 90A 1-Pole 240 V Circuit Breaker. This essential component is built for Square D QO load centers, delivering reliable overcurrent protection for dedicated 240V branches in both residential and light commercial panels. With a 90-amp rating and a single-pole configuration, it provides a focused safety solution for high-current circuits while preserving panel layout and wiring simplicity.

Key specifications

• Current rating: 90 A
• Poles: 1
• Voltage rating: 240 V
• Part number: QO190

What problems it solves

Overcurrent protection is essential for preventing wiring damage, reducing the risk of overheating and electrical fires. The QO190 detects abnormal current flow and interrupts power to the labeled 240V circuit, helping to safeguard both the wiring and connected equipment without affecting other circuits in the panel.

Ideal use cases

• Protects a dedicated 240V circuit in a Square D QO load center, especially for high-current appliances or equipment.
• Suitable as a replacement or upgrade in existing QO panels where a 90A, single-pole 240V breaker is required.
• Applicable in residential settings and small commercial installations where a robust, easily swappable breaker is beneficial for maintenance or reconfiguration.

Compatibility and installation

Designed to fit within Square D QO series panels, this breaker should be used in panels approved for 90A, 240V single-pole protection. For safety and code compliance, installation or replacement should be performed by a licensed electrician, ensuring the panel rating and wiring gauge are appropriate for a 90A 240V circuit.

Why choose the QO190

As part of the widely used Square D QO family, the QO190 offers a consistent form factor and dependable protection aligned with other QO breakers. Its 90A, 1-Pole, 240V specifications make it a precise match for high-current 240V branches, providing straightforward compatibility, simple maintenance, and confident protection within established electrical systems.