Cross over switch: connection diagram
To switch the electricity to different devices are used switches of the flip type. Their peculiarity lies in the presence of blockers. The parameters of this type of device are quite different. Also note that the wiring diagrams of devices depend on the network. To meet the switches of the flip type most often possible in residential buildings. Regulation of these devices is carried out through control units. In the industrial sphere, where backup generators are used, knife switches are also in demand. To understand in more detail the scheme of their connection, it is important to study the existing types.
Single Pole Switch
The throw-over switch of this type, as a rule, is made with one module. In this case, the conductors are used most often of copper type. Also note that for generators with a frequency of not more than 20 Hz, these devices are ideal. However, there are also drawbacks to the knife switches, and they should be taken into account.First of all, it is important to note that these devices are capable of withstanding a maximum load of 200 A. Thus, they are not suitable for residential buildings with high power consumption. Another feature of them lies in the low output voltage. On average, it does not exceed 200 V.
Double pole switch
The double-pole rocker switch is currently quite common. In residential buildings it is used frequently. It can be used both in single-phase and in two-phase circuits. The level of negative resistance on average is at around 60 ohms. In turn, the parameter of the output voltage depends on the specific modification. To date, the most common considered to be the device series PP20. Capacitors in them are open. In this case, the connection of the throw-over knife switch occurs through the power supply with a voltage of 300 V.
Connecting devices to a single-phase network
Connection to a single-phase circuit is possible only if there is a bipolar model (the designation of the toggle switch can always be seen on the back side).It should also be borne in mind that the power supply for these purposes will require 300 V. In this case, the negative resistance parameter can be hoped to be 50 Ohms. It should also be noted that in some cases counters are installed. In this case, switches are used quite rarely. Jumpers for contact bipolar models are suitable only for copper type. If we talk about homes, the switchboards are used in the KK202 series and others. Reversible blocks for single-phase circuits are poorly suited.
Connecting the device to a two-phase network
A throw-over switch is connected to a two-phase circuit, most often through a power supply unit of 200 V. You should also take into account that the switches are used only of the expansion type. In this case, the switches are suitable for a two-phase network with two or more modules. They are obliged to withstand the limiting voltage at 300 V. In this case, the load on them will be around 20 A. The PP30 series is considered to be the most common modification. In total, the manufacturer has two modules. In this case, the parameter of the output voltage is maintained at 350 V.
In this case, blockers are used in different types. If we consider residential buildings, there is always a meter in the network. In this case, control units are most often encountered with thyristors. Negative resistance in the network does not exceed 40 ohms. Contact systems for devices are only of a closed type. In this case, power surges are monitored using pass capacitors. At the same time, the reversing unit monitors the frequency of the current. In the case of two-phase models, they are used with the controller. Thus, nonlinear distortions in the circuit can be minimized.
Scheme of connection of the switch to the three-phase network
Connection of the switch to the three-phase circuit is carried out through the power supply units of 400 V. In this case, only transformers of the pulse type can be used. The device is directly connected via an inverting input. In this case, the output current is passed through the pass capacitors. Knife switches in this case are used mainly two-module.
However, there are also single-module modifications. But the threshold voltage they must withstand at least 350 V.In this case, the negative resistance can reach as much as 55 Ohms in the circuit. To solve this problem, there must be a special lock in the switch. Electrical panels in homes are often used in the KK22 series. At the same time, the control units are represented today with both thyristors and dynistors.
Breaker for generator
The switch for the generator is suitable only for the single module type. In this case, the blocker should be used with the usual contact system. Reversible blocks are most often encountered with a controller. In turn, models with a resonator for this purpose are poorly generated. In this case, the threshold frequency level will be quite high. In terms of switches, the switches are very different. In this situation, it is important to consider the number of feedthrough capacitors.
Before connecting the device, it is important to remember to check the grounding system. For this, the device must have a special grounding electrode. The manufacturer in this case is obliged to specify the protection system. Most often, models are made with marking IP30. All this suggests that the insulation in this case is applied fairly reliable, and the user can count on a large number of operating cycles.
This type of rocker switch (connection diagram is shown below) is suitable only for a single-phase circuit. There are two pass capacitors in total. At the same time, both two-module and three-module types are on the market. Power supplies for them are suitable for 300 V. The device can be connected via a meter. Jumpers in the instruments are mainly used copper type. In this case, the switches are suitable only for expansion.
It should also be noted that the switchboards in this case can be used of various types. The maximum threshold switch is able to withstand at 350 V. In this case, the load parameter depends solely on the manufacturer. On average, it fluctuates around 30 A.
The three-way switch type override switch includes extremely broad switches. In general, models are best suited for two-phase circuits. At the same time, they are especially in demand in the industrial sector. At the enterprises, they are most often installed in the electric switchboard of the KK202 series. Jumpers can be found copper.In this case, blockers in the knife switches are used in different types. One more feature of these knife switches can be called hypersensitivity. However, their security systems are fairly reliable. In turn, the class of insulation depends on the manufacturer.
Devices Series SFT 250A
The rocker switch 250A is suitable for power supplies of 200 and 300 V. The device is connected via pass capacitors. In this case, the load parameter should not exceed 3 A. Switches for systems are most often used in analog type. However, extensive modifications today are also found.
In residential buildings, knife switches of this type can be installed. However, the control units for them are suitable only on a thyristor basis. Also note that it is important to install meters behind the contact system. Reversible blocks in the circuit are used both with the controller and the resonator. In this case, much depends on the parameter of the peak frequency of the device.
Connection of switch SFT 100A
The switch circuit breaker 100A has a fairly simple. In this case, it is important to consider the output voltage parameter. If it exceeds 200 V, then the switch must be used only of the expansion type.In all other cases, many experts advise installing analog modifications. They have good throughput, and they are able to withstand more than 40 ohms negative resistance.
It should also be borne in mind that in this case, the manufacturer provides two flow capacitors. The device is directly connected via a network with a control unit. At the same time, meters can be installed behind the contact system. In this case, the threshold voltage should not exceed 300 V.
SFT 345A devices
The switches of this series are connected exclusively through reversible blocks. In this case, the controllers they use only openly type. For two-phase circuits, these switches are ideally suited. Also note that various control units can be used. In this case, the jumpers in the device are installed copper type.
In turn, the switches are used expansion with a large bandwidth. The protection system of the knife switch is available with IP30 marking. In this case, the insulation class of the device is quite high. Special attention in the presented device deserves the quality of the blocker.In this case, the voltage he is able to withstand a maximum of 33 A.