NB221040 - 40Amp Circuit Breaker

NB221040 - 40Amp Circuit Breaker

The NB221040 40 Amp circuit breaker is built to provide steady, reliable protection for 120/240VAC electrical systems in residential and light commercial settings. As a double pole breaker, it protects both legs of a 240-volt circuit, making it suitable for equipment and branch circuits that require balanced power distribution. Its thermal magnetic trip unit responds to prolonged overloads as well as sudden short circuits, helping reduce the risk of wiring damage and downtime. The bolt-on mounting style creates a secure, tight connection to the panel bus, which is especially important in applications where long-term stability matters. If you’re replacing an existing NB frame breaker, this 40A model offers a straightforward, dependable solution designed to match original panel specifications.

Key Features and Benefits

• 40 Amp, Double Pole Configuration – Protects both phases of a 120/240VAC circuit.
• Thermal Magnetic Trip – Handles overload conditions and short-circuit faults with responsive protection.
• 10k A.I.C. Rating – Rated to safely interrupt up to 10,000 amps at 120/240VAC.
• Bolt-On Installation – Secures firmly to compatible panels for improved electrical contact.
• Space-Conscious Design – Fits efficiently within panel layouts without unnecessary bulk.
  

Technical Specifications

• Model: NB221040
  
• Poles: 2
  
• Amperage: 40A
  
• Voltage: 120/240VAC
  
• Interrupting Rating: 10k A.I.C.
  
• Frame Type: NB
  
• Mounting: Bolt-On
  
• Dimensions:
  • 2.00" W x 3.38" L x 2.31" D
• Shipping Weight: 1.75 lbs
  

Material Compliance and Certifications

• UL Listed – Independently tested to meet recognized U.S. safety standards.
• RoHS Compliant – Manufactured in alignment with environmental safety requirements.
  

Where It Works Best

• The NB221040 40 Amp double pole breaker is best suited for existing residential and light commercial panels that require a bolt-on NB frame breaker. It works well in maintenance or direct replacement situations where matching amperage, voltage rating, and mounting style are essential for proper performance.