Schneider NSX250A Circuit Breaker

Product Overview

The Schneider NSX250A is a 250A frame current rating product under the ComPacT NSX series of قواطع دوائر الحالة المصبوبة. Specifically designed for medium and low-voltage power distribution systems, it features high reliability, modular design, and digital characteristics, and is a key component of Schneider’s EcoStruxure power distribution solutions.

Core Parameters

Trip Unit Comparison

1️⃣ TMD (Thermomagnetic Trip Unit)

Working Principle: Thermal elements (bimetallic strips) detect overloads, and electromagnetic elements detect short circuits.

سمات: Simple structure, low cost, narrow setting range (0.7~1In).

Application: General power distribution protection scenarios that do not require precise parameter adjustment.

2️⃣ Micrologic (Electronic Trip Unit)

Working Principle: Digital circuits perform monitoring and protection, providing multiple protection functions.

سمات:

– Wide setting range (0.4~1In) and high accuracy (±15%).

– Provides maintenance information such as contact wear and operation count.

– Supports multiple protection functions: overload, short-circuit short delay, earth fault, etc.

Application: Industrial and commercial power distribution that requires high protection accuracy and intelligent monitoring.

Application Scenarios

Industrial Power Distribution Systems: Protection for mechanical equipment and production lines.

Commercial Buildings: Main circuits in shopping malls and office buildings.

Data Centers: Power systems requiring high-reliability protection.

Residential Power Distribution: Main switches providing comprehensive protection.

Generator Protection: Supported by special models (TM-G).

Key Advantages

1. High Reliability: Adopts a double-rotating contact structure with a breaking capacity of up to 150kA to ensure system safety.
2. Modular Design:

– Multiple trip units optional to adapt to different load characteristics.

– Rich accessories: auxiliary contacts, alarm contacts, shunt trip devices, etc.

– Electric operating mechanism (≥160A) supports remote control.

3. Digital Characteristics:

– Electronic trip units provide precise protection and fault diagnosis.

– Supports integration with the Schneider EcoStruxure system to realize smart grid management.

Selection Points

1. Rated Current Selection: ≥ Calculated load current and ≤ 250A.
2. Breaking Capacity Selection:

– General civil/commercial use: 36kA (Type F) is sufficient.

– Industrial environments: 50kA (Type N) or higher.

– Special occasions (e.g., power plants): Consider 70-100kA (Type H/S).

3. Trip Unit Selection:

– Simple power distribution: TMD (cost-effective).

– Critical loads: Micrologic (intelligent protection).

4. Pole Number Selection:

– Three-phase equipment: 3P.

– Three-phase four-wire system: 4P.

Price Reference

TMD Type (36kA/50kA): Approximately 1,600-2,500 RMB

Micrologic Type: Approximately 2,500-5,000 RMB (depending on function complexity)

Summary

The Schneider NSX250A circuit breaker is a high-performance and high-reliability medium-voltage power distribution protection device. It is suitable for various industrial and commercial scenarios and offers multiple options ranging from basic thermomagnetic protection to intelligent electronic protection. When selecting, the appropriate model and configuration should be determined based on actual load characteristics, short-circuit current levels, and protection requirements。

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