Square D QOB315AS 315A 3-Pole 240 V Circuit Breaker

Meet the Square D QOB315AS 315A 3-Pole 240 V Circuit Breaker — a purpose-built, high-current protection device designed for demanding three-phase power systems. This component is built to safeguard your critical equipment from overloads and short circuits while delivering dependable performance in commercial and industrial environments.

Key specifications

• Current rating: 315 A
• Poles: 3
• Voltage rating: 240 V
• Part number: QOB315AS

What it protects and how it benefits you

For three-phase power distribution, the 3-pole design ensures simultaneous interruption of all live conductors during a fault, reducing equipment damage and improving overall system safety. A 240 V rating makes it suitable for protecting feeders, motors, and heavy loads typical in commercial buildings and light industrial facilities.

Why choose Square D QOB315AS

As part of the trusted Square D family, the QOB315AS is engineered for consistent trip characteristics and durable operation, offering reliable protection for high-current circuits. Its design aligns with Square D enclosures and bus systems, helping you maintain a cohesive, safe, and efficient electrical installation.

Ideal use cases

• Protect 3-phase motors and heavy equipment operating at 240 V in manufacturing and processing facilities
• Distribute and protect feeders in commercial electrical panels with substantial load
• Replace aging or undersized breakers in existing Square D installations to restore robust protection

Installation and compatibility tips

Ensure the panel accepts the QOB family and that the 315 A rating matches the protected circuit’s requirements. Follow manufacturer guidelines for mounting and safety practices to guarantee proper operation and long service life.