Square D QOU140 - 40A, 1-Pole, Circuit Breaker

The Square D QOU140 is a dedicated 40A, 1-Pole circuit breaker designed to deliver reliable overcurrent protection in electrical distribution systems. With a single-pole configuration, it provides precise protection for individual circuits within panelboards, switchboards, and control panels, making it a dependable choice for demanding industrial, commercial, and OEM environments.

• Current rating: 40 A
• Poles: 1-Pole
• Breaker type: Circuit Breaker

Why this breaker stands out in real-world installations:

• Compact, flexible protection — The 1-pole design fits into tight panel spaces while providing targeted protection for single-phase circuits in distribution panels and motor control centers.
• Versatile application — Ideal for safeguarding dedicated feeders, control circuits, and branch circuits across industrial facilities, commercial buildings, and OEM equipment setups.
• Reliable overcurrent protection — When current exceeds 40 A, the QOU140 activates to help prevent damage to wiring, components, and equipment in critical systems.

Ideal use cases

• Protect single-phase feeders and control circuits in industrial panelboards and MCCs.
• Safeguard essential circuits in commercial installations such as manufacturing lines, conveyors, and equipment racks.
• Integrate into OEM assemblies where compact, dependable overcurrent protection is required for a specific branch circuit.

Practical guidance for deployment

• Confirm compatibility with your panelboard, switchboard, or control panel that supports 1-pole, 40A protection configurations.
• Use as part of a coordinated protection scheme to isolate and protect individual circuits within larger distribution systems.
• Label circuits clearly and maintain documentation for maintenance and safety audits.

With the Square D QOU140, you gain a purpose-built solution that emphasizes precise current protection, space-efficient installation, and dependable performance in critical distribution networks. This breaker is a solid choice for professionals who require straightforward, effective protection for single-phase circuits across a range of industrial, commercial, and OEM applications.