Comprehensive introduction to LW5 series universal changeover switches

LW5 series universal changeover switches are one of the most widely used changeover switch products in China's electrical control field. They are manufactured by many well-known electrical companies, including Delixi, Tianzheng and other brands. This series of products has become an ideal choice for electrical control circuit conversion and small power motor control with its reliable structure, diverse functions and high cost performance. The following is a comprehensive introduction to the LW5 series from multiple dimensions such as product overview, technical parameters, model classification, and application fields.

1. Product Overview and Basic Features

LW5 series universal changeover switches are multi-purpose master control electrical appliances, mainly used in circuits with AC 50Hz, rated voltage up to 500V and DC voltage up to 440V. According to different uses, they can be divided into two categories:

(1) Master control changeover switches: used for the conversion of electrical control circuits.

(2) Motor control changeover switches: can directly control three-phase squirrel cage asynchronous motors of 5.5kW and below.

This series of products adopts modular design, and the number of contact system sections can be flexibly configured from 1 to 16 to meet control requirements of different complexity. The operation mode is divided into two types: positioning type and self-resetting type, and the actuator appearance is available in ball handle type and knob type. The protection form includes open type and protective type (IP40) to meet different installation environment requirements.

2. Core technical parameters and performance indicators

(1) Electrical parameters:

- Rated insulation voltage: 500V

- Rated working voltage:

AC: 500V and below

DC: 440V and below

- Conventional heating current: 16A

- Motor control capability: 5.5kW and below three-phase squirrel cage asynchronous motor

(2) Mechanical properties:

- Mechanical life: more than 1 million times

- Electrical life: more than 200,000 times

- Operating frequency:

* Intermittent cycle working system: 300 times/hour

* Eight-hour working system

(3) Structural parameters:

- Number of contact system sections: 1-16 sections

- Number of contacts per section: Double break contact group

- Installation method: Panel installation

- Dimensions: Varies according to the number of sections and operation mode

3. Product model analysis and classification

The LW5 series model naming rules contain rich information. Take LW5-16/5.5N3 as an example:

- LW5: Product series

- 16: Conventional thermal current 16A

- 5.5N: Can control 5.5kW motor and reversible conversion (N)

- 3: 3-section contact

According to different classification methods, the LW5 series can be divided into:

(1) According to the purpose:

- Master control (codes such as Q1, Q2)

- Motor control (N-reversible conversion, S-dual speed, SN-dual speed reversible, etc.)

(2) According to the operation mode:

- Positioning type (handle remains in the operating position)

- Self-resetting type (handle automatically returns to the original position)

(3) According to the appearance of the actuator:

- Ball handle type

- Knob type

(4) According to the protection form:

- Open type

- Protective type (IP40)

4. Typical application areas

The LW5 series universal changeover switch is widely used in the following fields due to its flexible and reliable characteristics:

(1) Industrial control field:

- Conversion of electrical control circuits

- Direct control of small power motors (start, stop, reversible conversion, speed change, etc.)

- Machine tool control circuit

- Test equipment switch

(2) Power system field:

- Remote control switch of power distribution equipment

- Phase measurement control of electrical measuring instruments

- Power switching device

(3) Building electrical field:

- Lighting control system

- Ventilation equipment control

- Elevator control system

5. Special models and derivative series

In addition to standard models, the LW5 series also includes some special models and derivative series:

(1) Explosion-proof LW5:

- Applicable to explosive gas environment Zone 1 and Zone 2

- Explosion-proof mark: ExdbebIICT6Gb

- Protection level: IP65/IP66

- Rated current: 10A-20A

- Widely used in hazardous places such as petroleum, chemical, and pharmaceutical industries

(2) Protective reversible conversion switch LW5-16/5.5N3:

- Housing protection level IP40

- Specially used for reversible control of motors

- Conventional closed heating current 16A

(3) Model with padlock function:

- Prevent unauthorized operation

- Used for power management of important equipment

6. Selection and installation guide

(1) Selection points:

- Select the rated value according to the load type (resistive/inductive) and current size

- Select the number of contact sections according to the control complexity

- Select the handle type according to the operating habits

- Select the protection level according to the environmental conditions

(2) Installation precautions:

- Strictly open the hole according to the product size

- The wiring terminals should be firmly connected

- Avoid using in humid, dusty or corrosive environments

- Regularly check the contact status and operating mechanism flexibility

(3) Maintenance recommendations:

- Clean the contacts regularly

- Check whether the operating mechanism is flexible

- Switches that are not used for a long time should be operated several times regularly

The LW5 series universal changeover switch has become a classic product in the domestic electrical control field with its mature design, reliable performance and economical price. Whether it is simple line conversion or low-power motor control, the LW5 series can provide a suitable solution. Through reasonable selection and correct installation and use, its performance advantages can be fully utilized to provide reliable operation guarantee for various electrical control systems.