Chint NM1LE-250S/4300A-160A 4-pole molded case residual current circuit breaker

Chint NM1LE-250S/4300A-160A is a 4-pole molded case residual current автоматический выключатель, mainly used in low-voltage power distribution systems to provide overload, short-circuit, residual current protection and line control functions.

я. Ключевые технические параметры

1. Basic Specifications

– Ток кадра: 250А (indicating the maximum continuous current that the circuit breaker frame can withstand).

– Номинальный ток: 160А (the current that can actually operate stably for a long time).

– Номер полюса: 4П (three-phase four-wire, suitable for three-phase loads and single-phase loads with neutral lines).

– Разрывная способность: 30тот (standard type, capable of interrupting a short-circuit current of 30kA).

– Residual Current Protection:

– Residual operating current is adjustable in three gears: 50/100/200мА, suitable for different safety requirements (например, 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. Характеристики срабатывания

– 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. Сертификаты и стандарты

– Complies with GB/T 14048.2 (Chinese standard) и МЭК 60947-2 (international standard), and has passed CCC certification.

II. Product Features and Applications

1. Основные функции

– Multi-level Protection: Integrates overload, short-circuit, and residual current protection to prevent electrical fires and personal electric shock.

– Высокая надежность: Mechanical life of 20,000 times and electrical life of 3,000 раз, adapting to frequent operation requirements.

– Экологическая адаптивность: Operating temperature range -5℃ to +40℃, altitude ≤2000 meters, suitable for industrial, коммерческий, and residential scenarios.

2. Типичные сценарии применения

– Industrial Power Distribution: Main switch or branch protection for production lines and motor control centers.

– Коммерческие здания: 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 and Maintenance

1. Способы установки

– Fixed Type: Фиксируется в распределительном шкафу с помощью проводки на передней панели., поддержка вертикальной или горизонтальной установки.

– Accessory Expansion: Optional shunt release (remote control opening), вспомогательные контакты (status feedback), и т. д.. Однако, it should be noted that the N pole of Type A circuit breakers does not support some accessories.

2. Меры предосторожности

– Характеристики проводки: 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.

– Экологические требования: 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.

– Альтернативные модели:

– NXMLE Series (например, 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. Price Reference

– The market price before discontinuation was approximately 1021 yuan/unit. The price of the alternative NXMLE series is slightly higher (например, NXMLE-160H is about 2018 yuan/unit), and the specific price is subject to the dealer’s quotation.

В. Selection Suggestions

1. Текущее соответствие: Select the rated current according to the total load current (например, 160A is suitable for loads ≤160A).

2. Разрывная способность: If the short-circuit current is high (например, in industrial environments), prioritize models with higher breaking capacity (например, 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, электрические схемы), you can visit the official website of Chint Electric or contact local dealers.