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What are the structural features of a knife switch?

Release time： 2025-09-30

A knife switch (also known as a blade switch) is a common low-voltage electrical device primarily used for connecting and disconnecting circuits. Here are the main structural features of a knife switch:

1. Control handle

Function : Used for manually operating the opening and closing of knife switches.
Features : Typically designed for ease of operation, it features clear on/off position indicators and provides a crisp tactile feedback during use.

2. Blade

Function : The blade is the core component of a knife switch, used to connect or disconnect the circuit.
Features ：
- Material Typically made from copper alloys with excellent conductivity, the surface is often coated with tin or silver to minimize oxidation and enhance electrical performance.
- Shape : Blade shapes vary widely—common options include single-blade, double-blade, and triple-blade designs—so choose based on your circuit requirements.
- Contact area :The blade has a large contact area with the stationary contact to minimize contact resistance and enhance conductivity.

3. Static contact

Function : Works in conjunction with the blade to create an on/off point for the circuit.
Features ：
- Material : Typically made from copper alloys, with surface treatments similar to those of blades, enhancing both conductivity and corrosion resistance.
- Structure : The stationary contact is typically fixed to an insulating base, establishing a reliable electrical connection when it comes into contact with the blade.

4. Insulating base

Function : Used to secure the blade and stationary contact, providing electrical insulation.

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