NB221040 - 40Amp Circuit Breaker
- 40 Amp
- 10k @ 120/240VAC
- 2 Pole
Purchase Options: New Aftermarket Replacement
NB221040 - 40Amp Circuit Breaker Description
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.
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Space-Conscious Design – Fits efficiently within panel layouts without unnecessary bulk.
Technical Specifications
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Model: NB221040
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Poles: 2
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Amperage: 40A
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Voltage: 120/240VAC
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Interrupting Rating: 10k A.I.C.
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Frame Type: NB
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Mounting: Bolt-On
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Dimensions:
- 2.00" W x 3.38" L x 2.31" D
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Shipping Weight: 1.75 lbs
Material Compliance and Certifications
- UL Listed – Independently tested to meet recognized U.S. safety standards.
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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.
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Specifications
- Width:2.0
- Height:3.38
- Depth:2.31
- Poles:2
- Amperes:40
- A.I.C. Rating & Volts:10k @ 120/240VAC
- Type:NB
- Approx Dimensions:2.00"W x 3.38"L x 2.31"D
- Additional Notes:Bolt-on, Thermal Magnetic Circuit Breaker.*Note: For the *New* offering, as this item is no longer manufactured by FPE, in it's place, we are offering a New after-market replacement circuit breaker specially designed to replace and fit into the existing location of the NB221040
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE shipping on breaker orders over $100 and all other items with orders over $500.
CIRCUIT BREAKER SUPERSTORE® offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).
Same Day Shipping
We strive to ship out your items within one business day.
In rare circumstances, CIRCUIT BREAKER SUPERSTORE® may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.
CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).