Schneider-MCCB-NSX250F-4P-250A

The **NSX250F 250A-4P circuit breaker** of Schneider Electric is a high-performance molded case circuit breaker (MCCB), specifically designed for three-phase four-wire systems, and is suitable for overload, short-circuit, and undervoltage protection. The following is a detailed analysis of its core parameters, functional characteristics, and application scenarios:

 I. Core Parameters and Technical Specifications

1. **Model Analysis*Schneider Circuit Breakers Price*

   - **NSX**: It is a series of molded case circuit breakers of Schneider, featuring modular design and high breaking capacity.

   - **250**: Frame Current, indicating that the maximum carrying capacity of the circuit breaker frame is 250A.

   - **F**: Breaking capacity grade, corresponding to **36kA** (applicable to the AC 415V system), suitable for medium short-circuit current environments.Chint's NB1-63DC series DC circuit breakers Price

   - **250A**: Rated current (In), which is the current value for long-term stable operation.

   - **4P**: Four-pole design, which can simultaneously disconnect three-phase live wires (L1/L2/L3) and the neutral wire (N), suitable for occasions where neutral wire protection is required (such as residential and commercial buildings).

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   - **Rated voltage**: AC 415V (applicable to the 60Hz system in the North American market).

   - **Tripping Characteristics*CHINT surge protector price*

     - **Thermal-magnetic tripping (TM)**: Standard configuration with overload long-time delay (Ir) and short-circuit instantaneous (Im) protection, suitable for power distribution lines and motor protection.

     - **Electronic tripping (Mic series)**: Micrologic tripping units can be optionally configured, supporting advanced protection functions such as short-circuit short-time delay (Isd) and ground fault (Ig).

   - **Breaking capacity**: 36kA (F grade), which can quickly cut off the short-circuit current and protect the equipment from damage.

3. **Mechanical Characteristics* Schneider LRD Thermal Relay Price*

   - **Installation method**: Fixed type, plug-in type, or draw-out type, supporting front-of-panel or rear-of-panel wiring.

   - **Operation method**: Manual rotating handle or electric operating mechanism, compatible with remote control.

   - **Size and weight**: The width is approximately 100mm (4P), with a compact volume, making it easy to install in the distribution box.

 II. Functions and Application Scenarios

1. **Core Functions**

   - **Overload protection**: Through the thermal tripping of the bimetallic strip, it will disconnect with a delay when the current exceeds the rated value (inverse time-lag characteristic).

   - **Short-circuit protection**: The electromagnetic tripper will trip instantaneously when the short-circuit current reaches the set value (such as 10 times In).

   - **Undervoltage protection**: An undervoltage release (UVR) can be optionally configured, which will automatically disconnect when the voltage is lower than the set threshold.

   - **Neutral wire protection**: The neutral pole (N pole) of the 4P circuit breaker supports two modes:

     - **Type B**: No tripper is installed on the N pole, and it breaks synchronously with the phase wires (suitable for scenarios where the neutral wire current is small).

     - **Type C**: A tripper is installed on the N pole, and it breaks synchronously with the phase wires (suitable for scenarios where the neutral wire current may be overloaded).

2. **Typical Applications**

   - **Industrial power distribution**: Main circuit protection of motor control centers (MCC) and power distribution cabinets.

   - **Commercial buildings**: Power distribution for lighting and air conditioning systems in office buildings and shopping malls.

   - **Residential**: Three-phase incoming line distribution boxes, protecting high-power electrical appliances (such as air conditioners and water heaters).

   - **Data centers**: Power protection for small and medium-sized server cabinets (accurate monitoring can be achieved by matching with an electronic tripper).

 III. Adaptability to the North American Market

1. **Certifications and Standards**

   - **UL certification**: The NSX250F has passed the UL 489 certification, meeting the safety requirements of the North American market, and can be used in 120/240V single-phase or 208/480V three-phase systems.

   - **Compliance standards**: IEC 60947-2 (international), UL 489 (North America), GB 14048.2 (China).

2. **Voltage and Frequency**

   - **Rated voltage**: AC 415V (compatible with the 208/480V system in North America).

   - **Frequency**: 50/60Hz, supporting the 60Hz power grid in North America.

3. **Installation Specifications**

   - **Wiring requirements**: Copper core wires conforming to UL standards should be used, and the torque requirement is **12-15 N·m** (refer to the installation manual for details).

   - **Ambient temperature**: -5°C to +40°C, adapting to the climate conditions in most regions of North America.

 IV. Selection and Alternative Solutions

1. **Selection Suggestions**

   - **Type of Tripper**

     - **TM (Thermal-magnetic)**: Economical and practical, suitable for conventional power distribution.

     - **Micrologic 2.2/5.2/6.2**: Supports current measurement, communication (Modbus), and custom protection curves, suitable for complex systems.

   - **Accessory Expansion**

     - **Auxiliary contact (AX)**: Indicates the status of the circuit breaker (closed/open).

     - **Shunt trip (MX)**: Remotely controls the opening of the circuit breaker.

     - **Residual current protection module (VE)**: Additional residual current protection (optional).

2. **Alternative Models**

   - **ComPacT NSX series**: Schneider's new generation of digital circuit breakers, supporting Internet of Things access, and compatible with the installation dimensions of the original NSX series.

   - **EZD series**: Economical molded case circuit breakers with a lower breaking capacity (such as 25kA), suitable for scenarios with limited budgets.

 V. Price and Supply

WhatsApp (86-13811255435)

2. **Supply Channels**

   - **Schneider*hebei china electric CO.,LTD

 VI. Maintenance and Troubleshooting

1. **Regular Inspections**

   - **Mechanical operation**: Ensure that the handle moves flexibly without jamming.

   - **Contact status**: Regularly clean the contact oxides and replace the worn parts if necessary.

   - **Tripping characteristic test**: Use special testing equipment to verify the overload and short-circuit protection functions.

2. **Common Faults**

   - **False tripping**: Check whether the load current exceeds the rated value or whether the tripper parameter settings are incorrect.

   - **Unable to close**: Check whether the undervoltage release is powered or whether the energy storage spring has failed.

   - **Contact overheating**: Confirm whether the wiring terminals are loose or whether the cross-sectional area of the wire is insufficient.

 VII. Summary

The NSX250F 250A-4P circuit breaker, with its high breaking capacity, modular design, and extensive certifications, has become a reliable choice for three-phase four-wire systems in the North American market. Its core advantages include:

- **High reliability**: The combination of a 36kA breaking capacity and thermal-magnetic/electronic trippers ensures rapid protection against short circuits and overloads.

- **Flexibility**: Supports multiple installation methods and accessory expansions, adapting to different application scenarios.

- **Digital support**: Intelligent trippers can be optionally configured to achieve power parameter monitoring and remote management.

I. Verification of Core Information in the Quotation Sheet

1. **Supplier Qualification**

   - **Company name**: hebei china Electric CO.,LTD

   - **Contact information**: The phone/WhatsApp (86-13811255435) is consistent with the information on the official website (www.transformerandswitchgear.com), but it is necessary to confirm the identity of the contact person Kent Du through an official channel (such as email).

2. **Product Information**

   - **Model parameters**: The breaking capacity of the Schneider NSX250F 4P 250A circuit breaker is 65kA, which complies with the IEC 60947-2 standard and is suitable for industrial power distribution systems.

   - **Price Comparison**

     - **Market reference**: The domestic procurement announcement in April 2025 shows that the unit price of this model is WhatsApp (86-13811255435) yuan, while the unit price in the quotation sheet is WhatsApp (86-13811255435) US dollars (approximately equivalent to WhatsApp (86-13811255435) yuan), and the price is basically reasonable.

     - **Bulk discount**: The unit price of this product for bulk procurement (≥100 units) can be as low as WhatsApp (86-13811255435) US dollars, and it is recommended to further negotiate the price.

3. **Delivery Terms**

   - **EXW terms**: The buyer needs to bear the transportation, insurance, customs clearance, and export license fees from the factory to the destination by themselves. It is recommended to entrust a professional freight forwarder (such as DHL Global Forwarding) to handle the logistics, and the estimated transportation cost is about 3000-5000 US dollars (from Hebei to Nouakchott Port, Mauritania).

 II. Risk Assessment and Response Strategies

1. **Payment Risk (100%TT)**

   - **Risk points**: After the advance payment, the supplier may delay the delivery or provide inferior products.

   - **Response measures**

     - Require the supplier to provide the company account (not a personal account) and a copy of the business license.

     - It is recommended to adopt the payment method of "30% advance payment + 70% against the copy of the bill of lading".

2. **Currency Unit Error**

   - **Problem**: The total price is marked as "WhatsApp (86-13811255435) yuan", but the unit price is in US dollars, and it should actually be WhatsApp (86-13811255435) US dollars.

   - **Handling suggestions**: Immediately contact the supplier by email or phone, request a written confirmation of the currency unit and the total price, and clearly correct it in the contract.

III. Operation Suggestions

1. **Contract Signing**

   - **Clear terms**

     - Specify the product model (NSX250F TM250D), technical parameters (breaking capacity 65kA), and acceptance standards (refer to the original Schneider instruction manual).

     - Agree on liquidated damages for delayed delivery (it is recommended to calculate at 0.5% per day).

   - **Dispute resolution**: Select the China International Economic and Trade Arbitration Commission (CIETAC) as the arbitration institution and apply Chinese law.

2. **Logistics Arrangement**

   - **Transportation plan**

     - Transport from the Hebei factory to Tianjin Port by road (about 800 kilometers, with a cost of about 2000 yuan).

     - Sea freight to Nouakchott Port (about 35 days, with a freight cost of about 3000 US dollars).

   - **Customs clearance documents**: Require the supplier to provide the certificate of origin (CO), packing list, commercial invoice, and CE certification.

3. **After-sales Guarantee**

   - **Warranty terms**: Require a 12-month warranty period, covering non-human damage.

   - **Technical support**: Confirm whether the supplier provides installation guidance or on-site services (with an additional cost of about 5000 US dollars).

V. Summary and Suggestions

- **Acceptance of quotation conditions**: If the supplier can correct the currency unit error, provide the company account information, and agree to the installment payment, cooperation can be considered.

Please proceed with the next step of operation only after receiving the written confirmation from the supplier. If necessary, a contract template and an analysis of trade terms can be provided.