Chint NCH8-40/20 Contactor

The Chint NCH8-40/20 is a modular household AC contactor. It is suitable for circuits with an AC frequency of 50/60Hz, a rated operating voltage of up to 400V, and a rated operating current of 40A. It is mainly used to control household appliances and low-inductance/micro-inductance loads for similar purposes, and can also be used to control household motors (with corresponding power reduction required).

Model Interpretation

NCH8: Series code (household AC contactor)

40: Rated operating current of 40A

20: Contact configuration (2لا – 2 normally open contacts)

Main Parameters

Note: AC-7a is applicable to household appliances and low-inductance loads for similar purposes; AC-7b is applicable to household motor loads.

Product Features

1. Modular Design: Compact size, easy to install on standard guide rails, saving space.
2. Multiple Control Voltages: Optional 24V/110V/220V/230V to meet different control requirements.
3. High Reliability: Complies with IEC/EN 61095 and GB/T 17885 standards, suitable for long-term use.
4. Multiple Contact Configurations: In addition to 20 (2لا), there are 11 (1لا + 1نورث كارولاينا), 02 (2نورث كارولاينا) and other options available.
5. Wide Temperature Operating Range: -25℃ ~ +70℃, adaptable to various environmental conditions.

Application Scenarios

1. Household Appliance Control: Remote control of large household appliances such as air conditioners, water heaters, and washing machines.
2. Commercial Buildings: Centralized control of electrical equipment in hotels and apartments.
3. Industrial Automation: Simple control of small equipment and production lines.
4. Smart Home Systems: Cooperates with PLC or intelligent control systems to realize the intellectualization of household appliances.
5. Lighting Systems: Timed/remote control of lighting in public areas.

Installation and Wiring

Installation Steps

1. Select a standard TH35-7.5 type guide rail.
2. Clip the contactor onto the guide rail to ensure it is secure.
3. Install vertically with an inclination angle not exceeding 5°.
4. Installation Spacing: Heat dissipation space must be reserved on both sides (≥10mm is recommended).

Wiring Requirements

Control Circuit: Use 1.5~2.5mm² wires with a wire stripping length of 9mm and a torque of 0.8N·m.

Main Circuit: Use 2.5~16mm² wires (selected according to load current) with a wire stripping length of 9~14mm and a torque of 0.8~3.5N·m.

Caution: Power must be cut off during installation and maintenance, and operations must be performed by professional personnel.

Typical Application Example

Controlling a 220V/7.5kW air conditioner:

“`

Power Supply → Circuit Breaker (63أ) → NCH8-40/20 Contactor → Air Conditioner

Controller (e.g., Thermostat) → Contactor Coil (220V)

“

When the temperature reaches the set value, the controller energizes the contactor coil, the contacts close, and the air conditioner starts. When the temperature drops, the controller cuts off the power, the contacts open, and the air conditioner stops.

Precautions

Strictly Prohibited: Use in flammable and explosive environments.

Do Not: Operate with wet hands.

– When controlling a motor, the power must be derated according to the AC-7b category (the maximum power of a 400V motor controlled by the 40A model is 6kW).

Must: Equip with appropriate short-circuit protection devices (such as miniature circuit breakers).

– When installed in a distribution box, spacers must be installed on both sides for heat dissipation.

Summary

The Chint NCH8-40/20 is a modular contactor with reliable performance and easy installation. It is particularly suitable for electrical control in household and small commercial applications. Its 2NO contact configuration, 40A rated current, and multiple control voltage options make it an ideal choice for home automation and small-scale industrial control.

Price of Chint NCH8-40/20 Contactor

The price range of the Chint NCH8-40/20 Contactor is ¥60 – ¥100, and the actual transaction price in mainstream sales channels is between ¥65 – ¥85. The specific price varies depending on the purchase channel, quantity, and region.

Official Channel Prices

Chint Electric Mall: The promotional price is approximately ¥69.09 per unit, and the market price is approximately ¥160.66 per unit (data as of November 2025).

Government Procurement Price: The reference price is ¥67.70, and the actual transaction price is approximately ¥60.69 (with a discount of about 10%).

Authorized Distributors: The price ranges from ¥65 to ¥85 per unit, and some distributors offer bulk discounts of 5-15%.

Factors Affecting the Price

1. Purchase Quantity: Bulk purchases (10 units or more) can enjoy a 10-20% discount, and a full box of 96 units costs approximately ¥60 – ¥65 per unit.
2. Coil Voltage: The standard 220/230V version has a lower price, while the special voltage versions (such as 24V/110V) are slightly more expensive (an increase of ¥5 – ¥10).
3. Sales Region: Prices in first-tier cities are slightly higher (an increase of ¥5 – ¥10), while prices in second and third-tier cities are relatively lower.

Purchase Recommendations

For Personal Household Use: It is recommended to purchase through the Chint official mall, Suning/JD official flagship stores. The unit price is approximately ¥65 – ¥75, ensuring quality.

For Engineering Bulk Procurement: Contact local authorized Chint distributors. For 10 units or more, the price can be negotiated to ¥55 – ¥65 per unit.

Authenticity Identification: Genuine products have clear laser marking, complete packaging, and CCC certification marks. Be cautious of products with excessively low prices (＜¥50).

Summary

As a 40A/2NO household AC contactor, the reasonable market price of the Chint NCH8-40/20 Contactor should be in the range of ¥60 – ¥100. The best purchase channel is WhatsApp: 0086-13811255435, and the actual transaction price is reasonably between ¥65 – ¥85.