Square D QOB340 - 40A, Circuit Breaker

Square D QOB340 — a dependable 40A circuit breaker engineered for demanding electrical environments. This protector is designed for panelboards, switchboards, control panels, and OEM equipment, delivering reliable overcurrent protection that keeps critical systems safe and operational.

Key advantages

• 40 Amp protection for branch circuits and motor feeds, helping to prevent wiring damage and unexpected outages.
• Versatile compatibility suitable for panelboards, switchboards, control panels, and OEM installations, enabling seamless integration into a variety of electrical architectures.
• Industrial-grade reliability built for continuous operation in distribution panels and motor control centers where safety and uptime are essential.

Practical use cases

• Protecting feeders and motors in manufacturing lines to ensure smooth, fault-free operation.
• Providing robust overcurrent protection in distribution panels for commercial facilities, data centers, and other critical environments.
• OEM applications requiring a proven 40A breaker to safeguard equipment while simplifying replacement parts sourcing.

Who should consider the Square D QOB340?

• Electrical engineers and facility managers assembling or upgrading electrical distribution systems
• Electricians stocking parts for panel replacements and OEM builds
• Manufacturers operating motor control centers and control panels demanding dependable protection

Why this model matters

• Backed by Square D’s legacy of reliability, delivering predictable performance at a practical 40A rating.
• Designed to minimize downtime by providing solid overcurrent protection in critical power paths within distribution panels and MCCs.

Specifications at a glance

• Current rating: 40A
• Breaker type: Circuit Breaker