QO240 - Square D 40 Amp 2 Pole 120/240VAC QO Series Plug-In Circuit Breaker, 10kAIC, Thermal Magnetic Trip, UL/CSA

Product Overview

The QO240 is a Square D QO Series 2-pole plug-in circuit breaker rated 40 amps for 120/240VAC systems. It features a thermal-magnetic trip and a 10 kAIC interrupting rating.

Designed for use in compatible QO load centers and panelboards, the QO240 is UL and CSA listed and supplied new from the manufacturer.

Key Features

• 40 amp rating, 2-pole (handles 120/240VAC circuits)
• Thermal-magnetic trip mechanism for combined overload and short-circuit protection
• 10 kAIC (10,000 A) interrupting capacity
• Plug-in design for Square D QO series load centers
• UL and CSA recognition

Function and basic protection

The QO240 is a 2-pole circuit breaker that provides combined thermal and magnetic protection for branch circuits. The thermal element responds to prolonged overloads while the magnetic element trips on high-current short-circuit events.

• Protects 120/240VAC branch circuits
• Two poles handle multi-wire or 240V loads requiring simultaneous disconnection

Electrical ratings and interrupting capacity

Use the QO240 where a 40 amp protective device is required on 120/240VAC wiring. The breaker is rated with a 10 kAIC interrupting capacity, indicating its capability to safely interrupt fault currents up to 10,000 amperes at its rated voltage.

• Ampere rating: 40 A
• Voltage: 120/240 VAC
• Interrupting rating: 10 kAIC (10,000 A)

Panel compatibility and mounting

The QO240 is a plug-in QO Series breaker intended for installation in compatible Square D QO load centers and panelboards. Its plug-in configuration is designed for standard QO bus stabs and enclosures.

• Plug-in mounting for Square D QO series panels
• 2-pole configuration occupies a two-pole position in the panel

Standards and listings

This breaker is listed to recognized safety standards and marked as UL and CSA compliant per the supplied product identity.

• UL listed
• CSA listed

Before You Order

Confirm the model number and quantity required before ordering. Verify compatibility with your existing QO series load center or panelboard and ensure a 40A 2-pole device is appropriate for the intended circuit.

• Confirm panel is Square D QO series and can accept plug-in QO breakers
• Verify required ampacity and coordinated protection with upstream equipment
• Request a quote for pricing and availability

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for QO240 - Square D 40 Amp 2 Pole 120/240VAC QO Series Plug-In Circuit Breaker, 10kAIC, Thermal Magnetic Trip, UL/CSA. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.