NJJ232400 - 400Amp Circuit Breaker Description
NJJ232400 - 400Amp Circuit Breaker
When you need to replace a circuit breaker, finding the right match is about more than checking the amperage. Frame type, mounting arrangement, electrical ratings, and physical dimensions all matter. The NJJ232400 400 Amp 2-Pole Bolt-On Circuit Breaker is a thermal-magnetic, molded-case circuit breaker designed and approved for NJJ-frame, 400 Amp, two-pole applications. For electricians and maintenance professionals working with compatible legacy electrical systems, the NJJ232400 helps maintain the original installation's specified form, fit, and function.
Another important detail is its 22kA interrupting rating at 240VAC. This rating indicates the breaker's specified ability to interrupt fault current up to 22,000 amperes at 240 volts AC under applicable rating conditions. Why does that matter? Because you must consider the available fault current at an installation when choosing a replacement. Matching the amperage alone is not enough to establish that a circuit breaker is suitable.
Key Features and Benefits
- 400 Amp Current Rating
- Two-Pole Configuration
- NJJ Frame Design
- Bolt-On Mounting
- Thermal-Magnetic Trip Mechanism
- 22kA Interrupting Rating at 240VAC
- Molded Case Construction
- Included Load-Side Lug Terminals
- 40°C Temperature Designation
Technical Specifications
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Part Number: NJJ232400
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Product Type: Molded Case Circuit Breaker
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Amperage: 400 Amps
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Number of Poles: 2
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Frame Type: NJJ
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Mounting Type: Bolt-On
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Trip Type: Thermal-Magnetic
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A.I.C. Rating: 22kA (22,000 Amps) at 240VAC
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Temperature Designation: 40°C (104°F)
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Terminal Configuration: Includes Load-Side Lug Terminals
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Width: 8.25 inches
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Height / Length: 10.13 inches
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Depth: 3.88 inches
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Overall Dimensions: 8.25"W x 10.13"L x 3.88"D
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Shipping Weight: 23.00 lbs.
Material Compliance and Certifications
The NJJ232400 is identified as a thermal-magnetic molded case circuit breaker with bolt-on mounting and included load-side lug terminals. Its documented specifications include a 400-amp current rating, two-pole configuration, NJJ frame, 22kA interrupting rating at 240VAC, and 40°C temperature designation.
UL listing, CSA certification, and RoHS compliance have not been independently confirmed. Verify any required certifications, material compliance, or equipment approvals using the markings on the actual breaker and applicable manufacturer documentation.
For installations governed by specific electrical codes, equipment approvals, or certification requirements, confirm that the NJJ232400 meets those requirements before installation.
Where It Works Best
The NJJ232400 is intended for applications where its electrical ratings, physical configuration, and mounting arrangement match the equipment manufacturer's requirements.
- Existing NJJ232400 Replacements
- Compatible Legacy Electrical Panels
- 400 Amp Two-Pole Electrical Circuits
- NJJ-Frame Breaker Applications
- Bolt-On Electrical Equipment
- Load-Side Lug Connection Applications
- Commercial and Industrial Electrical Equipment
- Electrical Maintenance and Repair
Install the NJJ232400 only in equipment that specifically permits it and where its ratings, terminal arrangement, and physical configuration meet the installation requirements.
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.
Eaton®, Cutler-Hammer®, Westinghouse®, Challenger®, Bussmann®, Edison®, Edison Fuse®, GTE Sylvania®, Crouse-Hinds®, and Cooper® are registered trademarks of Eaton Corporation plc. Products sold are surplus, used, or refurbished and are NOT supplied by Eaton Corporation plc or its affiliates.
Specifications
- Width:8.25
- Height:10.13
- Depth:3.88
- Poles:2
- Amperes:400
- A.I.C. Rating & Volts:22k @ 240VAC
- Type:NJJ
- Approx Dimensions:8.25"W x 10.13"L x 3.88"D
- Additional Notes:40°C, Bolt-On, Thermal Magnetic, Molded Case Circuit Breaker. Includes Load-Side Lug Terminals - discontinued by the manufacturer
Returns are easy
You may return unused items within 30 days of delivery for a refund, subject to our Return Policy.
FREE ground shipping on breaker orders over $100 and all other items with orders over $500.
Shipping charges are Prepaid and Allowed on UPS Ground orders for all other products on orders over $500.00, again only when shipping within the lower 48 continental United States, provided the product(s) can safely ship UPS Ground.
If the product cannot safely ship via UPS Ground, or is too heavy to ship UPS Ground, then the product will be shipped via freightliner at buyer's expense.
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).