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Chint NM1LE-250S/4300A-160A is a 4-pole molded case residual current cortacircuitos, mainly used in low-voltage power distribution systems to provide overload, cortocircuito, residual current protection and line control functions.
I. Key Technical Parameters
1. Especificaciones básicas
– Marco actual: 250A (indicating the maximum continuous current that the circuit breaker frame can withstand).
– Corriente nominal: 160A (the current that can actually operate stably for a long time).
– Número de polo: 4PAG (three-phase four-wire, suitable for three-phase loads and single-phase loads with neutral lines).
– Capacidad de ruptura: 30el (standard type, capable of interrupting a short-circuit current of 30kA).
– Protección de corriente residual:
– Residual operating current is adjustable in three gears: 50/100/200mamá, suitable for different safety requirements (p.ej., 50mA for general places, and below 30mA can be used as supplementary protection against personal electric shock).
– Residual operating time ≤0.1 seconds, quickly cutting off the faulty circuit.
2. Características de disparo
– Thermomagnetic Release: It has both overload long-time delay (thermal protection) and short-circuit instantaneous (magnetic protection) functions with precise response.
– N Pole Characteristics: Type A design (N pole is straight-through without overcurrent protection), suitable for power distribution systems where the neutral line is not cut off.
3. Certificaciones y estándares
– Cumple con GB/T 14048.2 (estándar chino) y CEI 60947-2 (estándar internacional), and has passed CCC certification.
II. Product Features and Applications
1. Funciones principales
– Multi-level Protection: Integrates overload, cortocircuito, and residual current protection to prevent electrical fires and personal electric shock.
– Alta confiabilidad: Mechanical life of 20,000 times and electrical life of 3,000 veces, adapting to frequent operation requirements.
– Adaptabilidad ambiental: Operating temperature range -5℃ to +40℃, altitude ≤2000 meters, adecuado para industrias, comercial, and residential scenarios.
2. Escenarios de aplicación típicos
– Industrial Power Distribution: Main switch or branch protection for production lines and motor control centers.
– Edificios Comerciales: Residual current protection for distribution boxes in office buildings and shopping malls.
– Residential and Infrastructure: Temporary electricity protection for community distribution rooms and construction elevators.
III. Instalación y mantenimiento
1. Métodos de instalación
– Fixed Type: Fixed in the distribution cabinet through front-panel wiring, supporting vertical or horizontal installation.
– Expansión de accesorios: Optional shunt release (remote control opening), contactos auxiliares (status feedback), etc.. Sin embargo, it should be noted that the N pole of Type A circuit breakers does not support some accessories.
2. Precauciones
– Especificaciones de cableado: Ensure that the incoming and outgoing line connections are firm to avoid overheating caused by looseness.
– Pruebas periódicas: Presione el “test button” monthly to check whether the residual current protection function is normal.
– Requisitos ambientales: The installation site should be dry, free of corrosive gases, and avoid dust accumulation affecting performance.
IV. Alternative Solutions and Market Status
1. Discontinuation and Alternatives
– Discontinued: This model is currently discontinued, with the order number 710301100004066. It is recommended to prioritize alternative models.
– Modelos alternativos:
– NXMLE Series (p.ej., NXMLE-250S/4300A-160A): The breaking capacity is increased to 36kA, supporting residual current alarm without tripping function, suitable for more complex scenarios.
– NM1LE-G Series: There is still inventory in some channels, which can be used as a transitional option.
2. Referencia de precio
– The market price before discontinuation was approximately 1021 yuan/unit. The price of the alternative NXMLE series is slightly higher (p.ej., NXMLE-160H is about 2018 yuan/unit), and the specific price is subject to the dealer’s quotation.
V. Selection Suggestions
1. Coincidencia actual: Select the rated current according to the total load current (p.ej., 160A is suitable for loads ≤160A).
2. Capacidad de ruptura: If the short-circuit current is high (p.ej., in industrial environments), prioritize models with higher breaking capacity (p.ej., NXMLE-H series with a breaking capacity of 50kA).
3. Residual Current Sensitivity: For places involving personal safety, it is recommended to choose models with residual current ≤30mA; for general power distribution, 50-200mA is optional.
4. Accessory Requirements: If remote control or status monitoring is needed, confirm in advance whether the circuit breaker supports the corresponding accessories.
For more detailed technical data (such as installation dimension drawings, wiring diagrams), you can visit the official website of Chint Electric or contact local dealers.
