Which Chint Model Corresponds to Schneider A9N21444?

The Chint equivalent model for the Schneider A9N21444 DC miniature circuit breaker is: NB1-63DC 2P C40A

Model Analysis and Corresponding Relationship

Schneider A9N21444 belongs to the Acti9 series C65N-DC DC miniature circuit breaker. Its key parameters are confirmed by disassembling the model:

Chint NB1-63DC series is a DC-specific miniature circuit breaker designed for DC systems. It is highly similar to Schneider C65N-DC series in terms of functions and technical parameters, making it an ideal domestic alternative.

Parameter Comparison Table

Selection Reasons

1. Highly Matched Technical Parameters: Both are 2P, 40A, C-curve DC circuit breakers with 6kA breaking capacity, enabling direct replacement.
2. Consistent Functions: Both are designed specifically for DC systems, featuring the same overload and short-circuit protection characteristics, and adopt magnetic blowout arc extinguishing technology to improve breaking safety.
3. Structural Compatibility: Standard 35mm DIN rail mounting with the same wiring method, facilitating on-site replacement and installation.
4. Cost-Effectiveness Advantage: As a well-known domestic brand, Chint offers better price advantages while ensuring performance.

Notes

– Confirm the actual application voltage: Schneider A9N21444 is suitable for 126V DC or 220V DC systems, while Chint NB1-63DC has a rated voltage of DC250V and is compatible for use.

– For precise matching, consider the specifications in Chint NB1-63DC series that fully correspond to Schneider C65N-DC.

Summary

The optimal Chint equivalent model for the Schneider A9N21444 DC miniature circuit breaker is NB1-63DC 2P C40A. The two models are almost identical in core technical parameters and functions, allowing direct replacement and providing a reliable domestic alternative.

 Functional Difference Comparison Between Chint NB1-63DC 2P C40A and Schneider A9N21444

Although the two products share the same basic functions (overload protection and short-circuit protection), there are the following differences in technical details:

1. Core Parameter Comparison

2. Differences in Arc Extinguishing Technology

Schneider C65N-DC:

– Adopts permanent magnetic blowout arc extinguishing technology, generating a magnetic field through built-in permanent magnets to quickly blow the arc into the arc extinguishing chamber at the moment of breaking.

– The arc is stretched, cooled, and extinguished under the action of the magnetic field, ensuring breaking reliability during short circuits.

Chint NB1-63DC:

– Adopts a patented arc extinguishing system that combines the synergistic effect of rotating plates and permanent magnets.

– A rotatable arc guide plate is installed in the arc extinguishing chamber, which cooperates with the permanent magnets on both sides to stretch the arc downward and extinguish it quickly.

– Specifically optimized for bidirectional non-polar DC circuits, solving the problem of difficult arc extinguishing under critical load currents.

Conclusion: Both adopt magnetic field-assisted arc extinguishing, but Chint’s technology may have advantages in bidirectional DC applications.

3. Differences in Functional Characteristics
4. Rated Voltage and Application Scenarios

Schneider: Mainly designed for 125V DC systems, such as traditional DC power distribution panels and communication power supplies.

Chint: Designed for 250V/500V DC systems with a wider coverage, suitable for:

– Communication base stations (24V/48V)

– Solar PV inverters (100V-500V)

– Electric vehicle charging piles (200V-500V)

– Industrial automation (220V)

Advantage: Chint has stronger applicability in high-voltage DC systems.

Accessory Compatibility

Schneider: Compatible with a variety of dedicated accessories:

– Earth leakage protection module (VigiC65-DC)

– Auxiliary contacts, alarm contacts

– Shunt trip device, undervoltage release device

Chint: Provides similar accessories but has slightly fewer types of high-end functional accessories compared to Schneider.

Standards and Certifications

– Both comply with IEC 60947-2 and GB/T 14048.2 standards.

Chint additionally holds CE, EAC, TÜV, and CCC certifications.

– As an international brand, Schneider may have a slight advantage in international standard compatibility.

Trip Characteristics and Protection Precision

– Both have Type C curves (instantaneous trip at 5-10 times the rated current) with consistent basic protection characteristics.

Schneider adopts a thermal-magnetic trip device with fast response speed and high precision.

Chint also adopts thermal-magnetic tripping but may have slight differences in temperature compensation and long-term stability.

4. Summary of Main Functional Differences
5. Voltage Adaptability: Chint NB1-63DC has a higher voltage rating (250V/500V vs. 125V) and a wider application range.
6. Arc Extinguishing Technology: Both use magnetic field-assisted arc extinguishing, but Chint’s patented rotating plate + permanent magnet combination may perform better in bidirectional DC applications.
7. Application Scenarios:

– Schneider is more suitable for standard 125V DC systems (e.g., traditional communication power supplies).

– Chint is more suitable for wide-voltage DC applications (especially systems above 200V).

4. Accessory Ecosystem: Schneider has a slight advantage in the variety of high-end functional accessories, while Chint’s general accessories are sufficiently complete.

Overall Evaluation: The two models are almost equivalent in basic protection functions, and the choice mainly depends on the application voltage level and accessory requirements. For DC systems above 250V, Chint NB1-63DC is a more natural choice; for use in standard 125V systems requiring rich accessory support, Schneider A9N21444 may be more advantageous.