Flip-switch - design features, varieties

A knife switch is a special switching device. It is used for switching an electrical circuit, for passing electricity. Such systems operate with the help of a manual drive. For example, when inspecting or repairing an electrical system without attachments, this kind is indispensable. A changeover 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) Multipolar.

2) Three-pole.

3) Bipolar.

4) Single pole.

In addition, you can find a changeover switch with a side or central lever.

To accommodate this device, special protection boxes are often used. On the outside side, the control lever is displayed.

These devices are easily applied not only in industrial electrical, but also for domestic purposes. Any changeover switch is universal.

What should I look for when buying?

In order to make the right choice, we must determine from the very beginning what this switch will be used for. After that, you can already proceed to other parameters. In addition, it is important to know what the power of electrical appliances included in a particular network.

Specialists mention several parameters, which you should pay attention to when visiting specialized stores. This working position, established trouble-free operating time, category of placement according to GOST and climatic design, rated voltage, rated breaking current and number of poles.

How to decode the marking?

If the package shows two digits, the second indicates the rated current, and the first indicates the number of poles. If the changeover switch Has a letter b in the marking, this means that a side lever is used. C is the designation for the central. When there are two letters, and the second of them n, this indicates the front connection of the wires. Finally, n and p are the switch and the switch, respectively.

A little about the design

The knife-type contact system is an obligatory component of any switches of this type. In addition, there are fixed parts in the form of spring clips. Metal knives enter into them when the system is closed. Due to this, the changeover switch does not break contact during use.

Additional Information

The absence or presence of arc chambers - possible designs for devices with a lever drive or a side handle. If it is located in the center, then special cameras are always absent. 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 Amperes, for example, there is a changeover switch 400A, the device is amplified by means of steel springs.

In addition, the model can be connected to fuses, which provide additional protection. For example, you can find a switch 250A with this design.