Square D QO3501021 Miniature Circuit Breaker – 50A – 3 Pole – 240V – Plug-In – Shunt Trip – QO Series

The Square D QO3501021 is a QO-series three-pole miniature circuit breaker designed for overcurrent protection and remote tripping capability in residential, commercial, and light industrial 240VAC systems. It provides thermal magnetic protection along with an integrated AC shunt trip function (120/208/240VAC), allowing remote disconnection when required. This breaker is compatible with QO load centers, NQ panelboards, and OEM distribution systems.

Electrical Ratings

• Current Rating: 50 A
• Voltage Rating: 240 VAC
• Frequency: 50/60 Hz
• Phase: 3 Phase
• Poles: 3 Pole
• Interrupting Rating: 10 kA @ 240 VAC

Protection and Function

• Trip Technology: Thermal Magnetic
• Trip Function: Common Trip (Overload + Short-Circuit Protection)
• Protection Type: Branch circuit protection
• Additional Function: AC Shunt Trip (remote trip capability)
• Application: Industrial and commercial power distribution systems

Configuration and Function

• Series: QO Series (Square D / Schneider Electric)
• Model: QO3501021
• Catalog Number: QO3501021
• Frame Type: QO Miniature Frame
• Mounting Style: Plug-On
• Terminal Type: Box Lug
• Compatibility: QO Load Centers, NQOD Panelboards, OEM interiors / Speed-D switchboards

Mechanical and Physical Characteristics

• Compact molded breaker housing
• Plug-on mounting for QO system compatibility
• Integrated AC shunt trip coil (120/208/240VAC)
• Box lug terminals for secure conductor termination
• Designed for three-phase distribution systems
• Wire range: 8 AWG to 2 AWG (Aluminum/Copper)
• Space-efficient QO-frame construction

Standards and Certifications

• UL Listed
• CSA Certified
• Manufactured by Schneider Electric / Square D
• Designed for North American electrical distribution standards

Returns are easy

You may return items within 30 days of delivery for a refund.

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