Chint Contactor NCH8G-40/20

The NCH8G-40/20 contactor by Chint is a modular contactor specifically designed for residential and small commercial applications. It is suitable for controlling low-inductance or micro-inductance loads (such as household appliances, lighting equipment, etc.). Below is a detailed breakdown of its core information: Core Parameters and Functions 1. Rated Current and Poles - **Rated Current of Main Contacts**: 40A (suitable for AC-7A/AC-7B load types), which can meet the power requirements of most household and small commercial equipment. - **Auxiliary Contact Configuration**: The "20" in the model indicates **2 normally open (NO) main contacts**. It features a no-auxiliary-contact design, resulting in a simple structure and optimized cost. 2. Voltage and Frequency Range - **Coil Voltage**: Supports 220-230V AC (common residential voltage); a 24V AC version is also available to adapt to specific control systems. - **Operating Voltage Range**: Applicable to circuits with AC 50/60Hz and rated operating voltage up to 400V. 3. Mechanical and Electrical Life - **Mechanical Life**: Up to 1,000,000 operations, ensuring long-term stable operation. - **Electrical Life**: 100,000 operations, meeting the needs of frequent switching (e.g., in smart home scenarios). 4. Mute and Safety Design - **Operating Noise**: Below 15 decibels (equivalent to the sound of quiet breathing), making it suitable for noise-sensitive environments (such as bedrooms and offices). - **Flame-Retardant Material**: Adopts thermosetting materials, which are high-temperature resistant and only carbonize (without burning) when exposed to open flames, complying with safety standards. II. Installation and Usage 1. DIN Rail Mounting - Supports quick installation on standard 35mm DIN rails. It can be installed in distribution boxes in combination with miniature circuit breakers, saving space and facilitating maintenance. - **Wiring Requirements**: For the main circuit, it is recommended to use 2.5-16mm² copper wires to ensure stable current transmission. 2. Application Scenarios - **Residential Sector**: Controls air conditioners, water heaters, electric heaters, smart home devices (such as electric curtains, smart sockets), etc. - **Small Commercial Sector**: Suitable for lighting control in hotels and apartments, as well as the start-stop control of small motors (such as exhaust fans and water pumps). III. Price and Market Positioning 1. Reference Price - The 2025 market price is approximately **35-50 RMB per unit** (prices may vary across different channels and promotional activities). It belongs to the mid-to-low-end residential contactor category with outstanding cost-effectiveness. - **Competitors**: Compared with similar products (e.g., Delixi CDCH8S series), it has a similar price but enjoys higher brand recognition.

2. Alternative Models - For more contacts, consider the **NCH8-40/40** (4 normally open contacts) or **NCH8-40/22** (2 normally open + 2 normally closed contacts). - For industrial scenarios, you can upgrade to the **NCH8-M series** (supports AC-1/AC-7A loads, with an IP20 protection rating). IV. Technical Advantages and Certifications 1. Standard Compliance - Complies with international standards IEC/EN 61095 and national standard GB/T 17885. It has obtained CE certification, ensuring reliable quality. 2. Design Optimization - **Direct-Acting Inverted Structure**: Reduces mechanical wear and improves reliability. - **Anti-Interference Capability**: Suitable for environments with large voltage fluctuations (-5℃ to +40℃). V. Precautions 1. Load Matching - Avoid using it for high-inductance loads (such as large motors and welding machines). If necessary, derate the load or use it with a surge suppressor. 2. Short-Circuit Protection - It must be used in conjunction with an appropriate miniature circuit breaker (e.g., Chint DZ47 series) to interrupt short-circuit currents. Summary With its mute operation, long service life, easy installation, and cost-effectiveness, the Chint NCH8G-40/20 is an ideal choice for residential and small commercial scenarios. For controlling multi-circuit or complex loads, you can expand to other models in the same series. When purchasing, it is recommended to use official channels or authorized distributors to ensure product quality and after-sales support