Free shipping on orders over $90

Expedited options are available at checkout.

3 PM shipping cutoff

Orders placed Monday–Friday before 3 PM ship the same day.

Up 24 months warranty.

24 months for NEW and 12 months for RECONDITIONED.

30-day returns

For unopened, unused items in original packaging. Contact us before returning.

Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 1
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 2
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 3
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 4
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 1
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 2
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 3
Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker - product image 4

Disclaimer: Actual product colors may vary slightly from the images shown due to different monitor settings and lighting conditions during photo shoots.

Square D

Square D QO240 40A 2-Pole 120/240V QO Circuit Breaker

In stock
SKU: QO240 NEW
(0)
$31.20
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Overview

The Square D QO240 is a 40A two-pole plug-in breaker for QO load centers and compatible panelboards. It provides common thermal-magnetic protection for 120/240V circuits with a 10 kA interrupt rating.

Key Features

  • 40A, 2-pole, 120/240V AC common-trip protection.
  • Direct plug-in QO mounting in two panel spaces.
  • Box lugs accept #8-2 AWG copper or aluminum conductors.
  • UL Listed, CSA certified, and HACR rated for QO-compatible panels.

Specifications

  • Model QO240; QO series; 40A; 2-pole; 120/240V
  • Interrupt rating: 10 kA; thermal-magnetic common trip
  • Wire range: #8-2 AWG Cu/Al

Common Applications

  • 40A HVAC and appliance branch circuits
  • Electric dryers and workshop equipment
  • QO load-center replacements and upgrades

Free shipping on eligible orders over $90. Our shipping cutoff is 3 PM, Monday–Friday. Available shipping services and delivery estimates are shown at checkout.

See our shipping policy for eligibility and exclusions. Orders are delivered; our warehouse is closed to the public.

Your product is covered by a 12 month Warranty or more if you opted for the extended warranty. Make sure you register your product.

Product Specifications

  • Brand Square D
  • Series QO
  • Model QO240
  • Breaker Type Thermal Magnetic and Regular Breaker
  • Frame Type NA
  • Phase 1 Phase
  • Pole 2 Pole
  • Voltage 120/240V
  • Amp 40
  • AIC Interrupting Rating 10 kA
  • Terminal Connection Box Lugs
  • Minimum Wire Gauge 8 AWG
  • Maximum Wire Gauge 2 AWG
  • Mounting Type Plug-ON,IN
  • Temperature Rating 104°F (40°C)
  • Certifications UL Listed, CSA Certified, and HACR Rated