Comprehensive introduction of LW30 series universal changeover switch

LW30 series universal changeover switch is a high-performance product widely used in China's electrical control field. It is manufactured by many well-known electrical companies, including Changxin brand, Changjiang Electric and other brands. With its compact structure, diverse functions and reliable performance, this series of products has become an ideal choice for ventilation equipment, air conditioning systems and water pump control. The following is a comprehensive introduction to the LW30 series from multiple dimensions such as technical parameters, product features, and application fields.

1. Product Overview and Basic Parameters

LW30 series universal changeover switch is a multi-purpose electrical control component, mainly suitable for electrical circuits with AC 50Hz, rated working voltage below 440V, DC voltage below 240V, and rated current from 20A to 100A. The product complies with the national standard GB14048.3 and the international standard IEC60947-3, and has good market recognition and international compatibility.

Changeover Switch

This series of products has a complete range of specifications, including current levels of 20A, 25A, 32A, 40A, 63A, 80A and 100A, which can meet the control requirements of different power loads. The rated insulation voltage reaches 690V, with good electrical isolation performance. The product adopts a modular design, and other contact blocks can be added to the 3-pole standard block without having to remove the entire switch, which greatly improves the convenience of installation and maintenance.

2. Product Features and Design Advantages

The LW30 series changeover switches have many outstanding design features and performance advantages:

(1) Compact structure and small size: The optimized design reduces the product size while ensuring performance, making it easy to install in a limited space. The panel size has various specifications such as 64×64mm depending on the model.

(2) Finger guard safety design: The finger guard function is specially designed to effectively prevent fingers from accidentally touching live parts during operation, thereby improving safety of use.

(3) Excellent electrical performance: The insulation distance is greater than other switches of the same type, and the disconnection speed is fast, which is suitable for both AC and DC circuits.

(4) Flexible operation mode: The product conversion operation is flexible and provides a variety of installation options, including panel mounting, base mounting, single-hole mounting and base mounting with door lock, etc.

(5) High reliability design: The material selection is exquisite, the insulation performance is good, and the contact system uses high-quality materials to ensure long-term reliability.

(6) Modular expansion capability: The modular design allows additional contact blocks to be added without disassembling the switch, which facilitates system expansion and function adjustment.

3. Technical Parameters

The LW30 series has rich and comprehensive technical parameters, and different models are optimized for different application scenarios:

(1) Rated electrical parameters:

- Rated insulation voltage: 690V

- Rated operating voltage: AC 440V, DC 240V

- Rated thermal current (ITH): 20A to 100A

- Rated operating current (LE): 240V/440V

(2) Load capacity:

- AC-21A application: 20A to 100A

- AC-22A application: 20A to 100A

- AC-23A application: 15A to 70A (corresponding to power 4kW to 37kW)

- AC-3 application (motor control): 11.7A to 57A (corresponding to power 3kW to 30kW)

(3) Mechanical characteristics:

- Operating frequency: 120 times/hour

- Mechanical life: 0.1×10⁶ times

- Electrical life: 0.03×10⁶ times

(4) Installation dimensions:

- Panel installation model dimensions: 64×42×54mm to 64×70×80mm

- Installation hole spacing: 48×48mm

- Installation hole diameter: φ10mm or φ4.2mm

(5) Environmental adaptability:

- Working environment temperature: -5℃ to +40℃

- Average temperature within 24 hours does not exceed +35℃

- Altitude does not exceed 2000 meters

4. Main application areas

The LW30 series universal changeover switch is widely used in many fields due to its excellent performance and wide adaptability:

(1) HVAC system:

- Main switch control of ventilation equipment

- Mode switching of air conditioning system

- Start and stop control of water pump system

(2) Industrial control field:

- Direct control of small capacity AC motor (maximum 37kW)

- Test equipment switch for selection and switching of test circuits

- Phase change measurement control of electrical measuring instruments

(3) Power distribution system:

- Remote control switch of power distribution equipment

- Power switching device to realize the conversion of main and standby power supply

- Circuit control switch to realize the switching of various circuit states

(4) Special application occasions:

- Models with door locks can be used for power management of important equipment

- Protective models are suitable for occasions with certain protection requirements

- Control and switching of DC circuits

5. Model classification and selection guide

The LW30 series can be divided into multiple models according to current level and installation method. Users can choose according to actual needs:

(1) Select by current level:

- Small current application (20A-32A): LW30-20, LW30-25, LW30-32

- Medium current application (40A-63A): LW30-40, LW30-63

- Large current application (80A-100A): LW30-80, LW30-100

(2) Select by installation method:

- Panel mounting type: Suitable for control cabinet panel mounting

- Base mounting type: Can be installed on a 35mm standard rail

- Single hole mounting type: Suitable for occasions with limited space

- Base mounting type with door lock: Used in occasions where misoperation needs to be prevented

(3) Select by special function:

- Standard type: Meets basic control requirements

- Protective type: With a protective cover, suitable for harsh environments

- Lockable type: Equipped with a padlock mechanism to prevent unauthorized operation

6. Precautions for installation and use

To ensure the safe and reliable operation of the LW30 series changeover switches, the following precautions should be taken during installation and use:

(1) Pre-installation inspection:

- Confirm that the switch model matches the load

- Check whether the switch appearance is intact and whether the operating mechanism is flexible

- Check whether the electrical parameters meet the system requirements

(2) Installation requirements:

- Open holes strictly according to product dimensions

- Ensure that the installation surface is flat to avoid stress concentration

- The wiring terminals should be firmly connected to avoid loose connections

(3) Use environment:

- Avoid using in humid, dusty or corrosive environments

- The ambient temperature should not exceed the specified range of the product

- Check the switch status regularly and clean the dust in time

(4) Maintenance:

- Check the contact status regularly and clean the contacts if necessary

- Check whether the operating mechanism is flexible and add lubricant if necessary

- Switches that are not used for a long time should be operated several times regularly to maintain the flexibility of the mechanism

The LW30 series universal changeover switch has become an important choice in the field of industrial control with its comprehensive performance, diverse models and wide applicability. Whether it is traditional electrical control or modern automation system, the LW30 series can provide reliable and flexible solutions. Through reasonable selection and correct installation and use, its performance advantages can be fully utilized to provide safe and reliable operation guarantees for various electrical control systems.