Chint NXM630S/3300-630A MCCB

Chint NXM630S/3300-630A is a автоматический выключатель в литом корпусе (MCCB) suitable for overload and short-circuit protection in industrial and commercial power distribution systems as well as for controlling the on-off operation of normal circuits.

Model Meaning and Product Positioning

– Интерпретация модели

NXM: Series code for Chint’s molded case circuit breakers.

630: Frame current rating indicating that the maximum rated current-carrying capacity of the circuit breaker is 630A.

С: Класс отключающей способности (Standard) corresponding to a breaking capacity of 50kA (at AC400V) suitable for power distribution systems with medium-level short-circuit current.

3300:

– Первый 3: Number of poles which is 3P (three-phase).

– Второй 3: Trip unit type which is thermal-magnetic (providing both overload long-time delay protection and short-circuit instantaneous protection).

– Last two 00: No internal accessories (such as auxiliary contacts shunt trip devices etc.).

630А: Rated operating current i.e. the maximum current value at which the circuit breaker can operate stably for a long time.

– Product Positioning

It is a standard-type product in the NXM series featuring high cost-effectiveness and reliability. It is widely used in power distribution systems for industry construction and infrastructure.

Ключевые технические параметры
Электрические характеристики

Номинальное напряжение: AC690V (suitable for three-phase systems).

Разрывная способность: 50тот (ultimate short-circuit breaking capacity ICU at AC400V) meeting the short-circuit protection requirements of most conventional power distribution scenarios.

Характеристики срабатывания:

– Overload Long-Time Delay Protection (Class L): Inverse-time action with a current setting range typically of 0.7-1.0 раз номинальный ток.

– Short-Circuit Instantaneous Protection (Class I): Instantaneous action with a current setting generally of 5-10 раз номинальный ток.

Mechanical and Environmental Specifications

Способ установки: Fixed type with circuits connected via front-panel wiring. It has a compact structure and is easy to install.

Метод работы: Manual operation with a standard-equipped handle for direct control of circuit on-off.

Operating Ambient Temperature: -5℃ to +40℃ adaptable to most industrial environments.

III. Сценарии применения

Power Distribution System Protection

– Used as a main circuit breaker or branch circuit breaker to protect the circuit safety of transformer outgoing lines power distribution cabinets and motor control centers (MCCs) preventing equipment damage or fire risks caused by overload and short-circuit faults.

Управление двигателем

– Can be used for infrequent starting and operation protection of motors but attention should be paid to whether its tripping characteristics match the motor’s starting current curve. For frequent starting or high-impact loads it is recommended to match it with an electronic trip unit or a dedicated motor protection circuit breaker.

Temporary Power Supply and Emergency Systems

– Due to its stability and ease of installation it is often used in scenarios such as temporary construction power supplies and backup power generation systems.

Installation and Selection Recommendations
Installation Key Points

– Ensure the installation location has good ventilation and avoid high-temperature and humid environments.

– When wiring connect the power cables (P1 P2) and load cables in accordance with the nameplate markings and tighten the terminals to prevent poor contact.

– If function expansion is required (например. remote control) optional accessories such as auxiliary contacts (for alarm or status indication) and shunt trip devices (for remote opening) can be selected but attention must be paid to model compatibility.

Selection Notes

Breaking Capacity Matching: Select an appropriate breaking capacity class (например. S=50kA H=70kA) based on the short-circuit current level of the system where it is used to avoid circuit breaker failure due to insufficient breaking capacity.

Rated Current Margin: It is recommended to set the rated current of the circuit breaker to 1.2-1.5 times the calculated load current so as to cope with short-term overloads and equipment starting currents.

Выбор номера полюса: Select 3P (three-phase three-wire) or 4P (three-phase four-wire) according to system requirements. A 4P circuit breaker can disconnect the neutral line (N поле) simultaneously making it suitable for systems that require leakage protection or neutral point grounding.

Market Reference and Alternative Solutions
Ценовой диапазон

– А 2025 market price is approximately 489.6 RMB to 738.4 юаней за единицу.

Альтернативные модели

Chint NM1 Series: For example NM1-630S/3300 which also has a breaking capacity of 50kA but is designed with a greater focus on cost-effective applications.

Schneider EZD Series: For example EZD630E-630A with a breaking capacity of 25kA suitable for scenarios with low short-circuit current. Its price is slightly higher but it has higher brand recognition.

Certification and After-Sales Service

– Стандарты сертификации

It has passed the CCC certification (China Compulsory Certification) complies with the requirements of the GB/T 14048.2 standard and some models may comply with the international IEC 60947-2 стандартный.

– Гарантия и обслуживание

Chint provides a warranty period of 1-3 years with specific terms subject to the product manual or the commitments of distributors. Its after-sales service network covers the whole country providing technical support and accessory replacement services.

Краткое содержание

With its stable performance reasonable price and wide applicability Chint NXM630S/3300-630A has become one of the mainstream choices for medium and low-voltage power distribution systems. In practical applications selection should be based on specific load characteristics and system requirements and installation specifications must be strictly followed to ensure safe and reliable operation. If higher requirements are placed on protection functions consideration can be given to upgrading to models with electronic trip units (например. NXMS series) or matching with intelligent monitoring modules.