NEF431050 - 50Amp Circuit Breaker

NEF431050 - 50Amp Circuit Breaker

The NEF431050 50 Amp Circuit Breaker is a dependable solution for protecting commercial and industrial electrical systems that require consistent, code-compliant performance. Designed as a 3-pole thermal magnetic molded case circuit breaker, this unit delivers reliable overload and short circuit protection in demanding 480VAC and 240VAC applications. With interrupting ratings of 14kA at 480VAC and 18kA at 240VAC, the NEF431050 helps safeguard panels, feeders, and connected equipment from costly electrical faults. Its bolt-on mounting configuration ensures a secure connection, making it a practical choice for maintenance teams and electrical professionals who need a precise, drop-in replacement within NEF frame systems.

Built for long-term service, this 50A circuit breaker combines durable internal components with time-tested thermal magnetic trip technology. The thermal element responds to prolonged overload conditions, while the magnetic mechanism reacts quickly to short circuits—providing balanced, responsive protection for three-phase power distribution systems.

Key Features and Benefits

• 50 Amp, 3-Pole Protection: Designed to handle three-phase applications requiring 50A overcurrent protection.
• Thermal Magnetic Trip Unit: Dual-response system protects against both sustained overloads and instantaneous short circuits.
• High Interrupting Capacity: Rated 14kA at 480VAC and 18kA at 240VAC to support demanding commercial and industrial environments.
• Bolt-On Mounting Design: Provides a secure mechanical and electrical connection to compatible panels.
• Molded Case Construction: Engineered for consistent performance and long service life in professional applications.
• NEF Frame Compatibility: Designed specifically for use within NEF frame systems for proper fit and function.

Technical Specifications

• Model Number: NEF431050
  
• Amperage Rating: 50 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 480VAC / 240VAC
  
• Interrupting Capacity (AIC):
  • 14kA @ 480VAC
  • 18kA @ 240VAC
• Breaker Type: Thermal Magnetic, Molded Case
  
• Frame Type: NEF
  
• Mounting Type: Bolt-On
  
• Dimensions: 4.13" W x 6.19" L x 3.38" D
  

Material Compliance and Certifications

• Industry Standards: The NEF431050 50A circuit breaker is manufactured using industry-compliant materials designed to meet recognized electrical safety and performance standards.
• Code Compliance: Molded case breakers in this class are built for use in accordance with applicable NEC requirements and relevant industry certifications, making them suitable for professional commercial and industrial installations where code compliance and system integrity are essential.
  

Where It Works Best

• This 50 amp 3 pole bolt-on circuit breaker is well suited for maintenance replacements, system upgrades, and repairs in commercial buildings, industrial facilities, and three-phase power distribution systems. It performs especially well in panelboards and distribution equipment where maintaining operational continuity and electrical safety is critical. Electricians and facility managers rely on this breaker when dependable overcurrent protection is required to keep equipment running and minimize downtime.