Disyuntor Schneider NSX250A

Product Overview

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

Parámetros principales

Trip Unit Comparison

1️⃣ TMD (Unidad de disparo termomagnética)

Principio de funcionamiento: Thermal elements (bimetallic strips) detect overloads, and electromagnetic elements detect short circuits.

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

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

2️⃣ Micrologic (Unidad de disparo electrónico)

Principio de funcionamiento: Digital circuits perform monitoring and protection, providing multiple protection functions.

Características:

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

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

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

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

Escenarios de aplicación

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

Edificios Comerciales: Main circuits in shopping malls and office buildings.

Centros de datos: Power systems requiring high-reliability protection.

Distribución de energía residencial: Main switches providing comprehensive protection.

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

Key Advantages

1. Alta confiabilidad: 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: contactos auxiliares, 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.

Puntos de selección

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

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

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

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

3. Trip Unit Selection:

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

– Critical loads: micrológico (intelligent protection).

4. Pole Number Selection:

– Three-phase equipment: 3PAG.

– Three-phase four-wire system: 4PAG.

Referencia de precio

Tipo de ATM (36kA/50kA): Aproximadamente 1,600-2,500 RMB

Tipo micrológico: Aproximadamente 2,500-5,000 RMB (depending on function complexity)

Resumen

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. Al seleccionar, the appropriate model and configuration should be determined based on actual load characteristics, short-circuit current levels, and protection requirements。

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