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China LW28 Series Change-Over Switch - Reliable Manual Switching Device from Trusted Suppliers and Factory

The LW28 series general change-over switch is an essential manual switching device, ideal for a wide range of applications in industrial, commercial, and electrical control panels. This reliable product, manufactured in China, is designed for infrequent manual connection, disconnection, and switching of electrical circuits, ensuring optimal performance under specified rated conditions. As a trusted supplier, our factory prioritizes quality and durability in our change-over switches, making them a preferred choice for professionals seeking efficient electrical solutions
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    Product Details

    LW28 Series General Change-Over Switch — Expanded Technical Specification

    1 Scope of Application

    The LW28 series general change-over switch is a versatile manual switching device engineered for reliable operation in industrial, commercial, and electrical control panel applications. It is primarily designed to perform infrequent manual connection, disconnection, and switching of electrical circuits under the following rated conditions:

    AC Systems: 50 Hz frequency, rated voltage ≤ 380 V, rated current up to 160 A

    DC Systems: Rated voltage ≤ 220 V, rated current up to 160 A

    This switch delivers multi-functional control capabilities across diverse scenarios, including:

    • ⚡ Direct on/off control of three-phase asynchronous motors (suitable for motors with matching voltage and current ratings)
    • ⚡ Master control switching for centralized electrical system management
    • ⚡ Circuit measurement and signal switching for instrumentation systems

    With its robust design and broad compatibility, the LW28 series switch serves as a high-performance replacement for a wide range of domestic change-over switch models. It is widely deployed in the following specific roles:

    • 🔹 Circuit control switch for power distribution cabinets and control panels
    • 🔹 Instrument testing switch for signal routing and parameter measurement in electrical test benches
    • 🔹 Motor control switch for direct start/stop of small-to-medium capacity three-phase asynchronous motors
    • 🔹 Master control switch for centralized operation of multiple electrical subsystems
    • 🔹 Dedicated change-over switch for welding machine power supply and mode selection
    2 Compliance with National Standards

    The LW28 series change-over switch strictly adheres to the requirements of relevant Chinese national standards, ensuring product safety, reliability, and interchangeability:

    Application Type Applicable Standard
    Main Circuit Change-Over Switch & Direct Motor Control Change-Over Switch GB14048.3-2001
    Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
    Master Control & Testing Change-Over Switch GB14048.5-2001
    Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and switching elements – Mechanical contactors and motor starters
    Frequently Asked Questions (FAQ)
    Q What is the maximum rated current supported by the LW28 series change-over switch?
    The LW28 series supports a maximum rated current of up to 160 A for both AC systems (≤ 380 V, 50 Hz) and DC systems (≤ 220 V), making it suitable for a wide range of industrial and commercial electrical applications.
    Q Can the LW28 series switch be used to directly control three-phase asynchronous motors?
    Yes. The LW28 series is specifically designed for direct on/off control of three-phase asynchronous motors, provided the motor's voltage and current ratings match the switch's specifications. It is commonly used as a motor control switch for small-to-medium capacity motors.
    Q Which national standards does the LW28 series comply with?
    The LW28 series complies with GB14048.3-2001 for main circuit and direct motor control applications, and GB14048.5-2001 for master control and testing applications. These standards are part of China's low-voltage switchgear and controlgear regulatory framework.
    Q Is the LW28 series suitable for use in welding machine applications?
    Yes. The LW28 series includes a dedicated change-over switch variant specifically designed for welding machine power supply and mode selection, making it a reliable choice for welding equipment control panels.
    Q What types of electrical systems is the LW28 series change-over switch designed for?
    The LW28 series is designed for use in both AC systems (50 Hz, rated voltage ≤ 380 V) and DC systems (rated voltage ≤ 220 V). It is widely applied in power distribution cabinets, control panels, electrical test benches, and centralized electrical management systems.
    Q Can the LW28 series replace other domestic change-over switch models?
    Yes. The LW28 series is engineered as a high-performance replacement for a wide range of domestic change-over switch models, offering broad compatibility and robust construction that meets or exceeds the performance of comparable products in its class.