Square D QO140 Mini Circuit Breaker 40A 1 Pole 120/240VAC 10kA Plug-In Mount

Description

Features

• Featuring the industry-exclusive QO plug-on design, this 40-amp single-pole breaker provides a high-speed "quick-make, quick-break" mechanism that minimizes internal arcing and contact wear. This ensures rapid circuit interruption during overloads or short circuits, protecting your sensitive electronics and branch wiring from thermal damage more effectively than standard thermal breakers.
• The QO140 includes a highly visible, integrated red indicator window that appears instantly when the breaker trips. This "Visi-Trip" feature eliminates the guesswork for homeowners and maintenance staff, allowing you to identify the specific faulted circuit in a dark electrical panel without having to manually test or reset every handle in the row.
• Designed with a space-saving 0.75-inch width, this breaker is specifically engineered for Square D QO, QO-P, and NQ panels. The compact footprint allows for maximum circuit density within your load center, making it the ideal solution for adding high-amperage dedicated circuits (like those for window AC units or small pumps) where panel space is at a premium.
• This breaker utilizes high-quality pressure plate wire connectors that ensure a tight, low-resistance connection for both copper and aluminum conductors. This superior termination method resists loosening over time even in environments with subtle mechanical vibrations reducing the risk of "hot spots" and potential fire hazards at the panel bus bar.

Documentation & Downloads

Specifications