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Chint NM1LE-250S/4300A-160A is a 4-pole molded case residual current disjoncteur, mainly used in low-voltage power distribution systems to provide overload, short-circuit, residual current protection and line control functions.
je. Paramètres techniques clés
1. Spécifications de base
– Frame Current: 250UN (indicating the maximum continuous current that the circuit breaker frame can withstand).
– Courant nominal: 160UN (the current that can actually operate stably for a long time).
– Numéro de pôle: 4P. (three-phase four-wire, suitable for three-phase loads and single-phase loads with neutral lines).
– Capacité de coupure: 30le (modèle standard, capable of interrupting a short-circuit current of 30kA).
– Residual Current Protection:
– Residual operating current is adjustable in three gears: 50/100/200mA, suitable for different safety requirements (par ex., 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. Tripping Characteristics
– 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. Certifications and Standards
– Complies with GB/T 14048.2 (Chinese standard) et CEI 60947-2 (norme internationale), and has passed CCC certification.
II. Product Features and Applications
1. Fonctions principales
– Multi-level Protection: Integrates overload, short-circuit, and residual current protection to prevent electrical fires and personal electric shock.
– Haute fiabilité: Mechanical life of 20,000 times and electrical life of 3,000 fois, adapting to frequent operation requirements.
– Adaptabilité environnementale: Operating temperature range -5℃ to +40℃, altitude ≤2000 meters, suitable for industrial, commercial, and residential scenarios.
2. Scénarios d'application typiques
– Industrial Power Distribution: Main switch or branch protection for production lines and motor control centers.
– Bâtiments commerciaux: 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. Installation et entretien
1. Méthodes d'installation
– Fixed Type: Fixed in the distribution cabinet through front-panel wiring, supporting vertical or horizontal installation.
– Accessory Expansion: Optional shunt release (remote control opening), contacts auxiliaires (status feedback), etc.. Cependant, it should be noted that the N pole of Type A circuit breakers does not support some accessories.
2. Précautions
– Spécifications de câblage: Ensure that the incoming and outgoing line connections are firm to avoid overheating caused by looseness.
– Regular Testing: Press the “test button” monthly to check whether the residual current protection function is normal.
– Exigences environnementales: 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
– Discontinué: This model is currently discontinued, with the order number 710301100004066. It is recommended to prioritize alternative models.
– Modèles alternatifs:
– NXMLE Series (par ex., 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. Référence de prix
– The market price before discontinuation was approximately 1021 yuan/unit. The price of the alternative NXMLE series is slightly higher (par ex., NXMLE-160H is about 2018 yuan/unit), and the specific price is subject to the dealer’s quotation.
V. Suggestions de sélection
1. Correspondance actuelle: Select the rated current according to the total load current (par ex., 160A is suitable for loads ≤160A).
2. Capacité de coupure: If the short-circuit current is high (par ex., in industrial environments), prioritize models with higher breaking capacity (par ex., 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, schémas de câblage), you can visit the official website of Chint Electric or contact local dealers.
