Square D QOB390 - 90A, 240VAC, 3-Pole, Circuit Breaker

For robust three-phase protection in demanding environments, the Square D QOB390 - 90A, 240VAC, 3-Pole Circuit Breaker delivers reliable overcurrent protection exactly where it's needed. Built to perform in industrial, commercial, and OEM settings, this breaker fits panelboards, switchboards, and control panels that demand dependable, coordinated protection for every phase.

• Current rating: 90A
• Voltage rating: 240VAC
• Poles: 3-Pole
• Breaker type: Circuit Breaker
• Configuration: Ideal for three-phase distribution and motor circuits

3-pole design streamlines installation in three-phase systems, reducing wiring complexity and providing synchronized interruption across all phases. This makes it an excellent choice for panelboards, switchboards, and motor control centers where space is at a premium and protection must cover every leg of the circuit.

Why choose the Square D QOB390 in your next project? It offers dependable overcurrent protection that helps guard motors, feeders, and downstream equipment from damage due to short circuits or overloads. In environments where uptime matters, this breaker supports safer operation and easier maintenance by clearly indicating fault conditions in a compact, serviceable package.

Ideal use cases include:

• Protecting 3-phase motor circuits in manufacturing lines, pumps, conveyors, and processing equipment
• Main protection for distribution panels and control centers in commercial facilities
• OEM applications requiring a reliable, compact 3-pole protection solution

Installation and integration notes:

• Designed to fit compatible Square D panelboards and switchgear intended for 3-phase 240V systems
• Verify that the enclosure and bus connections accommodate a 3-pole, 90A breaker
• Follow manufacturer installation guidelines for mounting, wiring, and safety practices to ensure proper operation

Choosing the Square D QOB390 means selecting a trusted solution that aligns with real-world needs: compact 3-phase protection, straightforward wiring, and dependable performance in panels and motor control centers. If your setup runs on 240V three-phase power and needs reliable, ready-to-install overcurrent protection, this breaker is a practical, purpose-built choice.