Square D QOB390 Circuit Breaker – 90A – 3-Pole – 120/240V – 10kA – Bolt-On – QO Series

The Square D QOB390 is a 90A, 3-pole bolt-on miniature circuit breaker designed for compatible Square D QO electrical distribution equipment. It is rated for 120/240V AC systems and provides a 10kA short-circuit current rating for branch circuit protection.

The breaker features HACR rating, Visi-Trip indication, and box-type lugs designed to accommodate 4–2/0 AWG copper and aluminum conductors. It is a genuine Schneider Electric / Square D product designed for compatible QO applications.

Specifications

• Brand: Square D
• Manufacturer: Schneider Electric
• Product Type: Miniature Circuit Breaker
• Series: QO
• Current Rating: 90A
• Number of Poles: 3-Pole
• Phase: 3-Phase
• System Voltage: 120V AC, 120/240V AC, 240V AC
• Voltage Rating: 240V AC
• Short-Circuit Current Rating: 10kA
• Circuit Breaker Type: Standard
• Mounting Type: Bolt-On
• Ratings: HACR Rated
• Electrical Connection: Box Lugs
• Wire Range: 4–2/0 AWG Copper and Aluminum
• Trip Indication: Visi-Trip
• Application: Branch circuit protection
• Authenticity: Authentic Schneider Electric / Square D Product

Part Numbers & Identification

• Manufacturer Part Number (MPN): QOB390
• Catalog Number: QOB390
• Alternate Model: Q0B390
• Product Family: QO / QOB Series
• Brand: Square D
• Manufacturer: Schneider Electric
• Product Type: 90A Circuit Breaker
• upc:785901019725

Compatibility

Designed for use with compatible Square D QO Series load centers, panelboards, and other electrical distribution equipment that accept QOB bolt-on circuit breakers. The QOB390 is suitable for compatible 3-phase, 120/240V and 240V AC applications.

Always verify the exact panel model, voltage, breaker configuration, conductor size, and approved breaker combinations before installation.

Certifications

• HACR Rated
• Authentic Schneider Electric / Square D Product

Returns are easy

You may return items within 10 days of delivery for a refund.

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My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.