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China LW28 Series Change-Over Switch - Reliable Manual Switching Device from Trusted Suppliers & Factory
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
Frequency: 50 Hz
Rated Voltage: ≤ 380 V
Rated Current: up to 160 A
DC Systems
Rated Voltage: ≤ 220 V
Rated Current: up to 160 A
⚡ Multi-Functional Control Capabilities
- 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:
Power Distribution
Circuit control switch for power distribution cabinets and control panels
Instrument Testing
Signal routing and parameter measurement in electrical test benches
Motor Control
Direct start/stop of small-to-medium capacity three-phase asynchronous motors
Master Control
Centralized operation of multiple electrical subsystems
Welding Machine
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:
| Switch Type | Applicable Standard | Standard Description |
|---|---|---|
| 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 |
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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 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 control applications.
Q
Can the LW28 series switch be used for direct motor start/stop control?
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 rated conditions. It is suitable for small-to-medium capacity motors.
Q
Which national standards does the LW28 series comply with?
The LW28 series complies with two key Chinese national standards: GB14048.3-2001 for main circuit and direct motor control change-over switches, and GB14048.5-2001 for master control and testing change-over switches. These standards ensure product safety, reliability, and interchangeability.
Q
Is the LW28 series suitable for use in welding machine applications?
Yes. The LW28 series includes a dedicated change-over switch configuration specifically designed for welding machine power supply switching and mode selection, making it a reliable choice for welding equipment control panels.
Q
What types of electrical systems is the LW28 series compatible with?
The LW28 series is compatible with both AC systems (50 Hz, ≤ 380 V) and DC systems (≤ 220 V). It is designed for use in power distribution cabinets, control panels, electrical test benches, and centralized master control systems across industrial and commercial environments.
Q
Can the LW28 series replace other domestic change-over switch models?
Yes. Due to its robust design and broad compatibility, the LW28 series is engineered to serve as a high-performance replacement for a wide range of domestic change-over switch models, offering equivalent or superior functionality across multiple application scenarios.