NEF421040 - 40Amp Circuit Breaker

NEF421040 - 40Amp Circuit Breaker

The NEF421040 40 amp circuit breaker is designed for dependable circuit protection in commercial and industrial panelboards. As a 2-pole, thermal magnetic breaker, it helps protect wiring and connected equipment from overloads and short circuits. Rated for use up to 480VAC, this breaker offers the interrupting capacity needed for many common distribution systems. Its bolt-on design provides a secure connection to the panel, making it a practical choice for electricians handling repairs, replacements, or routine maintenance.

Key Features and Benefits

• 40 Amp Rating: Suitable for branch circuits requiring 40A overcurrent protection.
• 2-Pole Configuration: Protects two conductors in 240V and 480V applications.
• Thermal Magnetic Trip: Delivers reliable response to both sustained overloads and instantaneous short-circuit faults.
• Bolt-On Mounting: Helps ensure a tight, stable installation within compatible panelboards.
• Molded Case Construction: Built for consistent performance in everyday commercial and industrial environments.
• Interrupting Capacity: 14k A.I.C. at 480VAC; 18k A.I.C. at 240VAC.

Technical Specifications

• Model: NEF421040
  
• Frame Type: NEF
  
• Amperage: 40 Amps
  
• Poles: 2
  
• Maximum Voltage: 480VAC
  
• A.I.C. Rating: 14k @ 480VAC; 18k @ 240VAC
  
• Dimensions: 2.75 in. W x 6.19 in. L x 3.38 in. D
  
• Approximate Weight: 4.5 lbs
  
• Mounting Type: Bolt-On
  
• Trip Type: Thermal Magnetic
  

Material Compliance and Certifications

• This NEF 40 amp circuit breaker is manufactured to meet established industry safety and performance standards. The internal components and molded case are designed to withstand normal electrical stresses when properly installed. It supports compliance with applicable national and local electrical codes in approved applications.

Where It Works Best

• The NEF421040 is commonly used in commercial buildings, industrial facilities, and service panels that require a 2-pole 40 amp circuit breaker. It is well suited for protecting lighting circuits, small equipment loads, and distribution panel branch circuits where dependable overcurrent protection is essential.