Square D QOB140 - 40A, 1-Pole, Circuit Breaker

Experience reliable overcurrent protection with the Square D QOB140—a 40A, 1-Pole circuit breaker engineered for demanding industrial, commercial, and OEM environments. This compact unit fits neatly into panelboards, switchboards, and control panels, delivering targeted protection where it matters most.

Designed for flexible installation in distribution panels and motor control centers, the QOB140 provides predictable performance with its straightforward 1-pole design. The 40A rating protects essential feeders and control circuits without unnecessary interruptions, helping maintain uptime and reduce wear on downstream equipment.

Who benefits most: maintenance teams, electrical contractors, OEM integrators, and facility managers who need dependable protection in tight spaces. This breaker is a natural fit in installations where modular protection is preferred and compatibility with Square D enclosures simplifies upgrades and replacements.

• Current rating: 40A
• Poles: 1-Pole
• Type: Circuit Breaker
• Applications: Panelboards, switchboards, and control panels
• Ideal for: Industrial, commercial, and OEM protection in distribution panels and motor control centers

Practical usage tips: verify the breaker fits your Square D panel family, ensure proper alignment with bus bars, and follow standard electrical practices for mounting and termination. In daily operation, expect consistent tripping behavior aligned with the 40A rating, providing clear protection boundaries for your critical circuits.