Description
Square D KAL26250 | 250A 2-Pole Circuit Breaker
Product Introduction
When replacing a legacy molded-case circuit breaker, matching the ampere rating is only the first step. Pole count, interrupting capacity, trip characteristics, mounting arrangement, and installed accessories all affect whether the replacement is suitable for the circuit.
The Square D KAL26250 is a 250 A, 2-pole K-Frame molded-case circuit breaker. It uses thermal-magnetic trip technology and belongs to Square D’s legacy K-Frame breaker family. The breaker is intended for circuit protection in compatible electrical distribution equipment—not as a generic substitute for any 250 A breaker.
For maintenance procurement, identify the complete catalog number and inspect the existing breaker’s nameplate. A breaker with the same current rating may have a different interrupting rating, trip configuration, or mounting interface. Verify those details before approving a replacement in an energized distribution system.
Key Technical Specifications
- Manufacturer: Square D / Schneider Electric
- Catalog Number: KAL26250
- Frame: K-Frame
- Breaker Type: Molded-case circuit breaker
- Rated Current: 250 A
- Number of Poles: 2
- Trip Technology: Thermal-magnetic
- Mounting Style: Unit mount, per supplier catalog data
- Voltage Ratings: Listed by secondary supplier sources for AC and DC applications; verify the exact rating on the breaker label and applicable OEM catalog
- Interrupting Capacity: Depends on voltage and exact breaker configuration; confirm from the nameplate and OEM tables
- Trip Function: Long-time and instantaneous protection
- Magnetic Trip: Supplier data describes adjustable magnetic trip
- Terminations: Lug configuration; verify included lug type and conductor range
- Accessories: Shunt trip, auxiliary switch, undervoltage release, alarm switch, and other options may be configuration-dependent
- Standards: Verify the applicable UL/CSA/IEC markings on the actual breaker
Schneider Electric provides technical information for legacy KA/KH/KC/KI and related breaker families in its legacy circuit-breaker catalog. Use the catalog and actual nameplate to validate the precise KAL26250 configuration; do not infer every rating or accessory from the K-Frame family alone.
Global Sourcing & Live-Test SOP
A surplus KAL26250 should be treated as a protective device requiring careful inspection and qualified evaluation. Visual condition alone does not establish its interrupting capability or trip performance.
1. Inbound Verification
- Photograph the complete nameplate and confirm KAL26250.
- Record serial, date, and manufacturing markings where present.
- Verify 250 A rating and 2-pole configuration.
- Inspect the molded case for cracks, burns, deformation, or signs of overheating.
- Check line/load terminals, lug hardware, and mounting points.
- Inspect for corrosion, contamination, or evidence of unauthorized repair.
- Record installed accessories and compare them with the buyer’s required configuration.
- Request traceability and prior test records where available.
2. Mechanical and Visual Inspection
- Check handle operation and external mechanism condition.
- Inspect terminal threads and contact areas for damage.
- Verify that the breaker has not been modified or reworked.
- Confirm the mounting arrangement matches the intended panel or switchboard.
- Check the nameplate for voltage and interrupting ratings.
- Do not assume that a breaker is serviceable because the handle moves freely.
3. Electrical Testing
Circuit-breaker testing should be performed by qualified personnel using appropriate equipment and procedures.
- Verify the breaker identity and ratings against the OEM documentation.
- Perform insulation-resistance testing only under an approved procedure that accounts for the breaker and any installed accessories.
- Conduct contact-resistance testing where required by the maintenance specification.
- Perform primary-injection or trip testing when required by the application and applicable maintenance standard.
- Record test equipment, test conditions, measured results, and acceptance criteria.
- Do not represent an untested surplus breaker as electrically certified.
4. Application and Coordination Review
Before installation:
- Confirm the system voltage and available fault current.
- Verify the breaker interrupting rating is adequate for the installation.
- Check the required pole count and switching arrangement.
- Review conductor sizing, lug compatibility, and terminal torque requirements.
- Confirm coordination with upstream and downstream protective devices.
- Verify any shunt trip, auxiliary contact, or undervoltage-release requirements.
- Have the replacement approved under the site’s electrical safety and maintenance process.
5. Final Preparation and Shipment
- Record the exact model and all nameplate ratings.
- Photograph the breaker, terminals, handle, and accessories.
- Include documented test results, if testing was performed.
- Protect terminals and the operating handle during shipment.
- Use suitable packaging to prevent impact damage.
- State the actual condition: new, used, refurbished, or tested surplus.
- Do not claim OEM certification, calibration, or warranty unless supported by the seller’s documentation.
Field Engineer’s Pitfall Guide
❗ Do not select a breaker by ampere rating alone
The is a 250 A, 2-pole breaker, but suitability also depends on voltage, interrupting capacity, trip characteristics, and installation requirements. Confirm the exact ratings against the breaker nameplate and applicable Schneider Electric documentation.
❗ Verify the K-Frame catalog number and accessories
Square D’s legacy breaker families include related catalog numbers with different electrical or mechanical configurations. Do not assume another K-Frame breaker—or a modern replacement—is a direct substitute without checking the OEM cross-reference and installed accessory package.
❗ Do not return an untested surplus breaker to critical service
A breaker may appear mechanically intact while having damaged contacts or altered trip performance. For critical distribution applications, use qualified inspection and electrical testing, and document acceptance before installation.
Intent-Driven FAQ
What is the Square D ?
The is a Square D K-Frame, 250 A, 2-pole thermal-magnetic molded-case circuit breaker. It is used for electrical circuit protection.
How many amps is the ?
The is rated at 250 A. Verify the nameplate on the actual unit before installation.
Is the a 2-pole breaker?
Yes. Supplier catalog data identifies the as a 2-pole breaker.
What trip technology does the use?
The is identified as a thermal-magnetic molded-case circuit breaker. Exact trip characteristics and settings should be confirmed from the OEM documentation for the specific breaker.
Can I replace the with a modern breaker?
Potentially, but do not assume a direct substitution based only on the 250 A rating. Confirm the approved replacement, interrupting rating, pole count, mounting, terminal configuration, and accessory requirements with Schneider Electric documentation or a qualified electrical engineer.
Is the discontinued?
It is a legacy Square D K-Frame product. Current availability and support status should be confirmed through Schneider Electric or a qualified distributor. Schneider Electric maintains technical documentation for legacy breaker families.
What should I check before buying a used ?
Confirm the full catalog number, 250 A rating, 2-pole configuration, voltage and interrupting ratings, terminal condition, accessories, physical condition, and documented test status. Request clear nameplate photos before purchase.
Bottom Line for Buyers
The is a legacy 250 A, 2-pole K-Frame molded-case circuit breaker with thermal-magnetic protection. It should be sourced by exact catalog number and validated against the electrical requirements of the installation.
For procurement, request a clear nameplate photo, confirm interrupting capacity and accessory configuration, and obtain documented inspection or test results when required. A matching ampere rating alone is not sufficient to establish a safe replacement.
