Expanded Technical Specification: LW28 Series General Change-Over Switch
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:
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Circuit control switch for power distribution cabinets and control panels
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Instrument testing switch for signal routing and parameter measurement in electrical test benches
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Motor control switch for direct start/stop of small-to-medium capacity three-phase asynchronous motors
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Master control switch for centralized operation of multiple electrical subsystems
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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:
GB14048.3-2001
Main Circuit & Direct Motor Control Change-Over Switch
Compliant with GB14048.3-2001 — Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units.
GB14048.5-2001
Master Control & Testing Change-Over Switch
Compliant with GB14048.5-2001 — Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and switching elements – Mechanical contactors and motor starters.
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Frequently Asked Questions
Q
What is the maximum rated current supported by the LW28 series change-over switch?
The LW28 series supports a 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 control three-phase asynchronous motors directly?
Yes. The LW28 series is specifically designed to provide direct on/off control of three-phase asynchronous motors, provided the motor's voltage and current ratings match the switch's rated specifications.
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 change-over switch applications, both being Chinese national standards for low-voltage switchgear and controlgear.
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 environments is the LW28 series designed for?
The LW28 series is engineered for industrial, commercial, and electrical control panel environments. It is suitable for power distribution cabinets, electrical test benches, motor control stations, and centralized multi-subsystem control applications.
Q
Can the LW28 series replace existing domestic change-over switch models?
Yes. The LW28 series is designed with broad compatibility and serves as a high-performance replacement for a wide range of domestic change-over switch models, offering improved reliability and multi-functional control capabilities.
