CHINT contactor

CHINT (Zhejiang Chint Electrics Co., Ltd.) contactors are core equipment in the fields of industrial automation and power control, and its product line covers a variety of application scenarios. The following will be described in terms of core series, technical characteristics, application solutions, and model selection suggestions:

 I. Core Product Line and Technical Parameters

1. NC5 Series Industrial-grade Contactors

- **Scope of Application**:

Used in circuits with an alternating current of 50/60Hz and a rated voltage of up to 690V. It supports the AC-3 load category (motor control), and the rated working current ranges from 9A to 630A.

- **Technical Highlights**:

  - **Modular Design**: It supports accessories such as side-mounted or top-mounted auxiliary contacts (such as the F4 series), delay modules, mechanical interlocks, etc., and can be expanded into reversible contactors or star-delta starters.

  - **Low-power Coil**: The power consumption of the AC coil is ≤10W, and that of the DC coil is ≤5W, reducing energy consumption.

  - **High Reliability**: The main contacts are made of silver alloy materials. The electrical life is ≥1 million times (AC-3), and the mechanical life is ≥10 million times.

- **Typical Models**:

  - NC5-12022: 12A, 3-pole main contacts, 1NO + 1NC auxiliary contacts, coil voltage 220V/380V.

  - NC5-63044: 630A, 4-pole main contacts, with top-mounted F4 auxiliary contacts as standard, suitable for the control of large motors.

2. CJX2 Series Economical Contactors

- **Positioning**:

General-purpose contactors, suitable for AC-3 loads (such as fans, water pumps). The rated current ranges from 9A to 95A, and the price is economical (for example, the wholesale price of CJX2-2510 is about 35 yuan per unit).

- **Technical Parameters**:

  - The coil voltage supports 24V to 380V, and the response time is ≤20ms.

  - The protection level is IP20, it supports 35mm rail installation, and it is used in combination with the NXR series thermal relays.

3. NCH8 Series Household/Small Commercial Contactors

- **Application Scenarios**:

Used for the control of air conditioners, lighting, and water pumps in residential houses and shops. It supports AC-7b loads (such as air conditioner compressors).

- **Characteristics**:

  - The rated current is 16A to 63A, with a 2-pole or 3-pole design, and a built-in surge suppressor.

  - It supports single-phase 220V or three-phase 380V, and a leakage protection function can be optionally configured.

4. NXC Series High-performance Contactors

- **Upgraded Features**:

It complies with the IEC 60947 standard, supports AC-4 loads (such as electric welders), the rated current ranges from 16A to 400A, and the coil voltage range is wide (24V to 440V).

- **Intelligent Functions**:

Some models integrate a current monitoring module and can achieve remote control through the RS485 interface (it needs to be used in combination with the CHINT Energy Management System).

5. Models for Special Environments

- **Explosion-proof Type**:

For example, the BXK series aluminum alloy explosion-proof contactors (ExdIIBT4) are suitable for dangerous environments such as oil and gas, and chemical industries, but they need to be customized (it is necessary to contact the CHINT Explosion-proof Business Department).

- **DC Type**:

The CZ0 series DC contactors have a rated voltage of up to 220V and a current of up to 600A. They use a transverse magnetic field for arc extinguishing and are suitable for the control of forklifts and electric vehicles.

II. Typical Applications and Supporting Solutions

1. Industrial Motor Control

- **Solution Configuration**:

  - **Main Circuit**: NC5-63044 contactor (630A) + NXR-630 thermal relay (overload protection).

  - **Control Circuit**: DGK-04PF voltage relay (undervoltage/overvoltage protection) + CJX2-1810 contactor (signal amplification).

- **Advantages**:

It realizes the full-process automation of motor start and stop, overload protection, and disconnection in case of abnormal voltage, with a response time ≤100ms.

2. Power Distribution in Commercial Buildings

- **Sub-metering Solution for Households**:

  - **Main Circuit**: NCH8-63M contactor (63A) + NXB-63 circuit breaker (short-circuit protection).

  - **Metering**: DTSY666 three-phase prepayment electric meter, which supports RS485 communication.

- **Functions**:

It realizes independent billing for multiple tenants, automatic power-off in case of outstanding fees, and is compatible with the remote meter reading of the CHINT cloud platform.

3. New Energy Field

- **Protection of Photovoltaic Inverters**:

  - **Configuration**: NC5-25044 contactor (250A) + DC fuse (short-circuit protection).

  - **Scenario**: When the grid voltage is abnormal, the contactor quickly cuts off the output of the inverter to protect the safety of the equipment.

 III. Model Selection and Alternative Solutions

1. Key Parameters for Model Selection

2. Recommended Alternative Models

IV. Key Points of Installation and Maintenance

1. Wiring Specifications

- **Main Circuit**:

The cross-sectional area of the copper busbar ≥16mm² (for currents above 63A), and the bolt torque ≥75N·m (for M12 bolts).

- **Control Circuit**:

Use shielded twisted-pair wires for the signal lines to avoid interference. The wiring terminals need to be tightened regularly (once a quarter).

2. Environmental Requirements

- **Temperature**:

For industrial models, it is -25°C to +55°C, and for household models, it is -5°C to +40°C. In a high-temperature environment, it needs to be derated for use (for example, the current is derated by 20% at 40°C).

- **Altitude**:

When it exceeds 2000m, a high-altitude type contactor (such as the NC5-G series) needs to be selected.

3. Maintenance Suggestions

- **Contact Inspection**:

Clean the oxide layer on the surface of the contacts with alcohol every six months, and replace them when the wear exceeds 1mm.

- **Coil Testing**:

Measure the coil resistance with a multimeter (the normal range is 50Ω to 200Ω), and replace it when it is abnormal.

V. Procurement and Compliance

1. Suppliers and Prices

- **Channels**:

  - **Authorized Dealers of CHINT**: Query through the official website or call 400-887-3288.

  - **E-commerce Platforms**: JD.com, Tmall flagship stores. The unit price of NC5-12022 is about 150 yuan. A 20% discount is available for bulk purchases (≥100 units).

- **Delivery Cycle**:

In-stock orders will be shipped within 1 to 3 days, and customized models (such as explosion-proof types) will take 7 to 15 days.

2. Certifications and Standards

- **Domestic**:

CCC certification, type approval of measuring instruments (CPA).

- **International**:

CE, UL certifications (it is necessary to state when placing an order).

 VI. Typical Troubleshooting

Through the above solutions, CHINT contactors can meet the full-scenario requirements from household to industrial levels. Combining their high reliability and economy, they have become the mainstream choice in the field of power control. If explosion-proof or intelligent communication functions are required, it is recommended to contact CHINT technical support for customized solutions.