2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
The knife switch is a special switching device. It is used to switch the electrical circuit, to transmit electricity. Such systems work with the help of a manual drive. For example, when inspecting or repairing an electrical system, you cannot do without devices of this kind. The toggle switch is generally one of the simplest modifications of the switches in this group.
Application and classifications
If we talk about the number of contacts, then these devices can be:
1) Multipole.
2) Three-pole.
3) Bipolar.
4) Single pole.
In addition, you can find a toggle knife switch with a side or central lever.
To accommodate this device, special protective boxes are often used. At the same time, the control lever is displayed on the outside.
These devices are easy to use not only in industrial electrical, but also for domestic purposes. Any toggle switch is universal.
What should I look for when buying?
To make the right choice,it is necessary to decide from the very beginning what exactly this switch will be used for. After that, you can already move on to other parameters. In addition, it is important to know what is the power of electrical appliances included in a particular network.
Specialists mention several parameters that you should pay attention to when visiting specialized stores. These are the operating position, installed fail-safe operating time, GOST placement category and climatic version, rated voltage, rated breaking current and number of poles.
How to decipher the markings?
If two numbers are visible on the package, the second indicates the rated current, and the first indicates the number of poles. If the toggle switch has the letter b in the marking, this means that the side lever is used. C is the designation for central. When there are two letters, and the second of them is n, this indicates a front connection of wires. Finally, n and r are the switch and knife switch, respectively.
A little about the design
Knife-type contact system is a mandatory component of any switches of this type. In addition, there are fixed parts in the form of spring clips. Metal knives enter them when the system closes. Thanks to this, the toggle switch does not break contact during use.
Additional information
Absence or presence of arc quenching chambers - possible designs for devices with a lever drive or a side handle. If it is in the center, thenspecial cameras are always missing. But there are spark-extinguishing contacts. Thus, when the equipment is turned off, it does not depend on how fast the lever rotates. If the current of the device is more than 200 Amps, for example, there is a 400A toggle switch, then the device is reinforced with steel springs.
In addition, the model can be connected with fuses, which provide additional protection. For example, you can find a 250A toggle switch with this design.
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