NEF421020 - 20Amp Circuit Breaker

NEF421020 - 20Amp Circuit Breaker

The NEF421020 is a 20 amp, 2 pole thermal magnetic circuit breaker designed to protect dual-phase electrical systems from overloads and short circuits. Built for dependable performance in commercial, industrial, and residential panelboards, this bolt-on molded case breaker delivers consistent circuit protection where it matters most. If you’re replacing an existing NEF frame breaker or handling routine electrical maintenance, the NEF421020 offers a secure fit and reliable trip response to help keep your system operating safely. This breaker uses a thermal magnetic trip mechanism, which means it responds to both prolonged overload conditions and sudden short circuits. The bolt-on mounting style provides a solid mechanical and electrical connection to the panel, reducing the risk of loose connections over time. With interrupting ratings of 14kA at 480VAC and 18kA at 240VAC, it’s built to handle demanding applications while maintaining proper protection standards.

Key Features and Benefits

• 20 amp current rating: For branch circuit protection
• 2 pole configuration: For dual-phase applications
• Thermal magnetic trip: For accurate overload and short-circuit protection
• Bolt-on installation: For secure panel mounting
• Molded case design: Built for long-term durability
• Compact size: For easy replacement in compatible NEF frame panels

Technical Specifications

• Model Number: NEF421020
  
• Amperage: 20A
  
• Poles: 2
  
• Voltage Rating: Up to 480VAC
  
• Interrupting Capacity:
  • 14kA @ 480VAC
  • 18kA @ 240VAC
• Frame Type: NEF
  
• Mounting Type: Bolt-On
  
• Dimensions:
  • Width: 2.75"
  • Length: 6.19"
  • Depth: 3.38"

Material Compliance and Certifications

• Industry Standards: The NEF421020 circuit breaker is manufactured to meet established electrical safety and performance standards. Each unit is designed for consistent trip operation within its rated capacity and constructed using quality insulating and conductive materials suitable for panelboard applications. Proper installation within a compatible system helps ensure safe and reliable performance.

Where It Works Best

• This 20 amp 2 pole NEF breaker is commonly used in commercial facilities, light industrial buildings, and residential applications that require dependable dual-phase protection. It’s especially well-suited for maintenance projects, panel upgrades, and direct replacement of existing NEF frame breakers. Electricians and maintenance professionals rely on breakers like the NEF421020 to restore protection quickly without altering the panel configuration.