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China LW28 Series Change-Over Switch - Reliable Manual Switching Device from Trusted Suppliers & Factory
Product Overview
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:
- 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:
GB14048.3
-2001
-2001
Main circuit change-over switch & 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
-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
Q1
What is the maximum rated current supported by the LW28 series change-over switch?
The LW28 series supports a maximum rated current of 160 A, applicable to both AC systems (rated voltage ≤ 380 V, 50 Hz) and DC systems (rated voltage ≤ 220 V). This capacity makes it well-suited for a broad range of industrial and commercial electrical control scenarios.
Q2
Can the LW28 series be used to directly start and stop three-phase asynchronous motors?
Yes. The LW28 series is specifically designed for direct on/off control of three-phase asynchronous motors. It is appropriate for small-to-medium capacity motors where the motor's voltage and current ratings are compatible with the switch's rated specifications.
Q3
Which Chinese national standards does the LW28 series comply with?
The LW28 series complies with GB14048.3-2001 for main circuit and motor control change-over switches, and GB14048.5-2001 for master control and testing change-over switches — both are Chinese national standards governing low-voltage switchgear and controlgear.
Q4
What are the typical application scenarios for the LW28 series switch?
The LW28 series is widely deployed as a circuit control switch in power distribution cabinets, as an instrument testing switch in electrical test benches, as a motor control switch for three-phase asynchronous motors, as a master control switch for multi-subsystem management, and as a dedicated change-over switch for welding machine power supply and mode selection.
Q5
Is the LW28 series compatible with existing 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. Its broad compatibility allows for straightforward integration into existing electrical systems and control panels without major modification.
Q6
What is the difference in voltage rating between AC and DC operation for the LW28 series?
For AC operation, the LW28 supports a rated voltage of up to 380 V at 50 Hz. For DC operation, the maximum rated voltage is 220 V. In both cases, the switch accommodates a rated current of up to 160 A, ensuring consistent and reliable performance across both system types.