QOB350 - 50 Amp Circuit Breaker

QOB350 - 50 Amp Circuit Breaker

When dependable circuit protection matters, the QOB350 bolt-on circuit breaker delivers the performance professionals rely on. Built for Type QOB panelboards, this 3-pole, 50-amp circuit breaker is designed to help protect electrical systems from overloads and short circuits while providing a secure bolt-on connection that stays firmly in place. Whether you're replacing an existing breaker during maintenance or completing a new installation, the QOB350 offers the confidence that comes from using a breaker designed for consistent, long-lasting operation.

With a 10kA interrupting rating at 240VAC, the QOB350 is well-suited for a variety of three-phase applications, including commercial buildings, industrial facilities, and institutional environments. Its thermal-magnetic trip mechanism reacts quickly to electrical faults while allowing normal operating currents to pass without interruption. The compact design also makes installation easier in compatible panelboards where space is at a premium.

From protecting HVAC equipment and lighting circuits to safeguarding motors and distribution panels, the QOB350 is a dependable choice for electricians, contractors, facility managers, and maintenance professionals who need reliable branch circuit protection.

Key Features and Benefits

• 50 Amp Current Rating: 50 Amp current rating for protecting medium-capacity branch circuits.
• Three-Pole Design: Three-pole design for three-phase electrical systems.
• Bolt-On Mounting: Bolt-on mounting provides a secure, stable installation in compatible Type QOB panelboards.
• 10kA Interrupting Capacity: 10kA interrupting capacity at 240VAC helps protect equipment during fault conditions.
• Thermal-Magnetic Protection: Thermal-magnetic protection responds to both overloads and short circuits.
• Compact Dimensions: Compact dimensions allow for efficient use of panel space.
• Dependable Performance: Designed for dependable performance in demanding commercial and industrial environments.
• Replacement and Upgrade Applications: Ideal for maintenance, upgrades, and replacement projects where compatibility with Type QOB panelboards is required.
  

Technical Specifications

• Part Number: QOB350
  
• Type: QOB
  
• Mounting Style: Bolt-On
  
• Poles: 3
  
• Amperage: 50 Amps
  
• Voltage Rating: 240 VAC
  
• Interrupting Rating: 10kA @ 240VAC
  
• Dimensions:
  • Height: 3.0 in.
  • Width: 2.25 in.
  • Depth: 2.5 in.

Material Compliance and Certifications

• Industry Standards: The QOB350 is manufactured for use in electrical power distribution systems and is designed to meet applicable industry standards for its product category.
• Installation Guidance: Always verify compatibility with your panelboard, follow the National Electrical Code (NEC), and comply with all local electrical codes. Installation should be performed by a qualified professional to ensure safe and reliable operation.
  

Where It Works Best

• The QOB350 is a great fit for protecting three-phase branch circuits in a variety of applications, including:
  • Commercial office buildings
  • Industrial manufacturing facilities
  • Schools and universities
  • Healthcare facilities
  • Retail stores and shopping centers
  • Warehouses and distribution centers
  • HVAC equipment
  • Motor control circuits
  • Lighting distribution systems
  • Mechanical equipment panels
  • General-purpose three-phase electrical distribution
  Whether you're maintaining an existing electrical system or expanding one, the QOB350 3-pole 50-amp bolt-on circuit breaker provides the dependable overcurrent protection needed to help keep electrical equipment operating safely and efficiently.