Packet switch that is used and where

Packet switch has received the most widespread in the Soviet years. And it can be found in virtually every home ownership. He was the main switch to shut off or turn on the power.

But because of the small capacity it replaced by circuit breakers that are not only steel disables the load, but also to protect the wiring short-circuit, which was not using batchfile. Just batchfile very poorly tolerate voltage drops.

But, despite these obvious shortcomings, packet switches and still actively used in switchboards, circuit power plan, control points on the substation control panels.

Design and specifications PV

These switching devices are structurally executed on one, two or three poles. Thus if the network operating voltage is 380 V, the MF for a maximum of 60 amperes, and if the operating supply voltage is 220 V, the MF for a maximum of 100 Amperes.

Externally, the switching device consists of a modest size barrel to the handle and pin terminals.

Located within the contact group and the switching mechanism. The moving contacts, which are made of insulating material, mounted on a square hub. And all this is housed in. A directly the body itself is made of insulated washers which are joined by screws.

Handle via a special spring mechanism changes the position of the moving contacts. And these contacts are secured in special plates made of fiber for reliable positioning and fast arc extinction.

External contacts can be compared with a small knife, and they are placed in plastic washers.

How the packet switches

The operating principle of the packet switch is extremely simple:

By turning the handle 90 degrees occurs spring tension, which affects the movable washer. Fixators stabilize it, and then transmits the washer contact group pulse. And so there is circuit-opening contacts.

Note. Disc PV operates in only two modes: on and off. But there are so-called cam batchfile (wafer). They can be programmed, ie the switch contacts will depend on the location of the initial switch.

types batchfile

The degree of protection, the following packet switches:

1. Open. Such articles are designed for installation in switchgear dry dust flaps and high humidity, for example in relay cabinets.

2. Protected. These products are made with protection against accidental contact and ingress of objects on the exposed live parts. Typically, the plastic casing, which means that this product can be installed outside the flaps.

3. Completely sealed. Aluminum housing hermetically sealed allows you to mount the batchfile in particularly wet areas as well as in open areas.

On mounting type differ as follows:

Connection scheme and decoding markings MF

For example, let's look at the wiring diagram packet switch to a single-phase electricity meters.

Each packet switch has a marking. To decipher it correctly, look carefully at the following picture:

conclusions

It is best to use a packet switch in places where a fairly frequent switching power supply, because the number of switching cycles before failure at a power of 8.0 is 20 000 times ratio.

That's all I wanted to tell you about the packet switches. Thanks for attention!