QOB3301021 - 30A Circuit Breaker w/ 120V Shunt

QOB3301021 - 30A Circuit Breaker w/ 120V Shunt

When you’re maintaining or servicing an existing Square D QO panel, finding the right breaker matters. The QOB3301021 is designed to match those systems, giving you a straightforward replacement that fits correctly and performs as expected. This 30-amp, 3-pole bolt-on breaker is commonly used in QO load centers, as well as NQ and NQOD panelboards, making it a practical option for keeping older or existing setups up and running. One thing you’ll notice right away is how easy it is to tell when the breaker has tripped. The built-in Visi-Trip indicator clearly shows when the circuit has been interrupted, which can save time when you’re tracking down an issue. It also includes a factory-installed AC shunt trip, allowing the breaker to be opened remotely—useful in situations where power needs to be shut off quickly from a distance. Internally, the breaker is designed so that if one pole detects a fault, all three poles open together. That kind of coordinated response helps protect connected equipment and keeps the system behaving the way it should. It’s a simple, reliable solution built to last and designed specifically for compatibility with existing Square D QO equipment.

Key Features and Benefits

• 30A, 3-pole breaker for multi-phase circuit protection
• Bolt-on design for secure installation in compatible panels
• Factory-installed AC shunt trip for remote operation
• Visi-Trip indicator shows when the breaker has tripped
• All poles open simultaneously during an overcurrent event
• Quick-make, quick-break switching mechanism
• HACR rated for HVAC-related systems
• Designed for proper fit and function in QO equipment

Technical Specifications

• Catalog Number: QOB3301021
  
• Series: QO
  
• Amperage: 30 Amps
  
• Voltage Rating: 240V AC
  
• Poles: 3
  
• Mounting Type: Bolt-On
  
• Interrupt Rating: 10kA @ 240V AC
  
• Shunt Trip: 120/208/240V AC (factory installed)
  
• Connection Type: Pressure plate
  
• Wire Range: AWG 14–8 (Copper or Aluminum)
  
• Torque: 35.4 lb-in
  
• Dimensions: 3.0" H x 3.0" W x 2.9" D
  
• Weight: 1.19 lbs
  
• Ambient Rating: Up to 104°F (40°C)
  

Material Compliance and Certifications

• UL Listed (UL File E84967)
• CSA Certified
• Meets established industry safety standards
• Built for consistent, long-term use in rated conditions

Where It Works Best

• QO load centers using bolt-on breakers
• NQ and NQOD panelboards in commercial environments
• Industrial distribution panels and switchboards
• OEM equipment requiring QO-compatible breakers
• Emergency shutdown systems with remote trip capability
• Fire and life-safety circuits
• Replacement needs in existing electrical systems