Square D QOU340 Miniature Circuit Breaker – 40A – 3-Pole – 240VAC – 10kA @ 240VAC – Unit Mount – QOU Series

The Square D QOU340 is a 40A, 3-pole standard miniature circuit breaker from the QOU Series. It features thermal-magnetic protection and is designed for compatible electrical distribution applications. The breaker is rated for 120/240V AC systems with a 10kA interrupting rating at 120/240V AC, 120V AC, and 240V AC, and a 5kA interrupting rating at 48V DC.

The QOU340 uses a unit-mount configuration with slotted box lugs on both the line and load sides. It accommodates 14–2 AWG aluminum or copper conductors and is rated for HACR and switching-duty applications.

Specifications:

• Brand: Square D
• Manufacturer: Schneider Electric
• Product Type: Miniature Circuit Breaker
• Series: QOU
• Circuit Breaker Type: Standard
• Current Rating: 40A
• Number of Poles: 3-Pole
• Phase: 3-Phase
• System Voltage: 120V AC, 120/240V AC, 240V AC, 48V AC
• AC Interrupting Rating: 10kA @ 120/240V AC, 120V AC, and 240V AC
• DC Interrupting Rating: 5kA @ 48V DC
• Protection Type: Thermal-Magnetic
• Application Rating: HACR and Switching Duty Rated
• Mounting Mode: Unit Mount
• Electrical Connection: Slotted Box Lugs, Line Side and Load Side
• Wire Range: 14–2 AWG Aluminum/Copper
• Height: 4.05 in
• Width: 2.25 in
• Depth: 2.95 in
• Dimensions (H × W × D): 4.05 × 2.25 × 2.95 in
• Application: Overcurrent Protection and Switching Duty

Part Numbers & Identification:

• Manufacturer Part Number (MPN): QOU340
• Catalog Number: QOU340
• Alternate Model: Q0U340
• Product Family: QOU Series Circuit Breakers
• Series: QOU
• Brand: Square D
• Manufacturer: Schneider Electric
• Product Type: Miniature Circuit Breaker
• Model: QOU340
• Breaker Configuration: 3-Pole, 40A
• upc:785901418955

Compatibility:

Designed for use with compatible Square D QOU Series electrical distribution equipment supporting 3-pole, 40A miniature circuit breakers. The QOU340 provides thermal-magnetic overcurrent protection and is suitable for HACR and switching-duty applications.

The breaker accommodates 14–2 AWG copper or aluminum conductors and uses slotted box lugs on the line and load sides. Always verify the specific equipment model, approved breaker type, system voltage, available fault current, pole configuration, conductor size, terminal arrangement, and installation requirements before installation.

Certifications:

• CSA Certified
• IEC Certified
• UL Listed
• HACR Rated
• Switching Duty Rated
• Thermal-Magnetic Protection
• 40A Rated
• 3-Pole / 3-Phase
• Genuine Square D / Schneider Electric Product

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