NEF421100 - 100Amp Circuit Breaker

NEF421100 - 100Amp Circuit Breaker

The NEF421100 circuit breaker is a 2 pole, 100 amp molded case circuit breaker designed to deliver dependable overcurrent protection for commercial and industrial electrical systems. Built with proven thermal magnetic trip technology, this NEF frame breaker helps protect equipment and wiring from overloads and short circuits before they can cause costly damage or downtime. Its bolt-on mounting configuration ensures a secure connection within compatible panelboards, making it a practical solution for maintenance, retrofit, or replacement projects. With a compact footprint and strong interrupting capacity, the NEF421100 is engineered to keep your electrical distribution system operating safely and efficiently.

Key Features and Benefits

• 100 Amp, 2 Pole Configuration – Designed to protect dual-phase circuits in 240V and 480V applications, delivering consistent performance under demanding electrical loads.
• Thermal Magnetic Trip Unit – Combines thermal overload protection with instantaneous magnetic short-circuit protection for accurate and reliable fault interruption.
• High Interrupting Capacity – Rated at 14kAIC at 480VAC and 18kAIC at 240VAC, providing dependable protection in higher fault current environments.
• Bolt-On Mounting Design – Ensures a secure and stable installation in compatible panels, reducing the risk of loose connections and improving long-term reliability.
• Molded Case Construction – Built for durability and everyday performance in commercial and industrial electrical systems.
  

Technical Specifications

• Manufacturer Part Number: NEF421100
  
• Poles: 2
  
• Amperage Rating: 100 Amps
  
• Voltage Rating: Up to 480VAC
  
• A.I.C. Rating: 14kA @ 480VAC; 18kA @ 240VAC
  
• Frame Type: NEF
  
• Mounting Type: Bolt-On
  
• Trip Type: Thermal Magnetic
  
• Dimensions: 2.75" W x 6.19" L x 3.38" D
  

Material Compliance and Certifications

• The NEF421100 100A circuit breaker is manufactured to meet strict industry safety and performance standards. Each unit is tested to ensure proper operation under rated conditions, helping maintain compliance with applicable electrical codes and safety requirements.
• Its molded case housing is constructed from high-quality materials designed to withstand heat and mechanical stress commonly encountered in electrical distribution systems.
  

Where It Works Best

• This 100 amp 2 pole NEF circuit breaker is ideal for use in commercial buildings, industrial facilities, and large residential applications where dependable branch or feeder circuit protection is essential.
• It is especially well-suited for maintenance replacements in existing NEF panelboards, allowing electricians and facility managers to restore system protection without major modifications.
• Whether you’re protecting HVAC equipment, distribution panels, or heavy-duty machinery circuits, the NEF421100 provides the reliable performance needed to safeguard your electrical infrastructure.