A cam switch is a device that is designed to switch electrical circuits. The principle of operation of the device is based on a change in the clock frequency. The most common switches are found in transformers. They are also actively used in measuring instruments. In order to learn more about switches, it is necessary to consider the scheme of the usual modification.
Model outline
The switch circuit contains movable type contacts and a switch. Directly, the handle is fixed on the trigger. To change the position of the contacts of the device, tetrodes are used. The controller is installed with the modulator. Filters are used to stabilize the frequency reduction.
Two-contact devices
The two-pin cam switch is ideal for pulse transformers. In this case, the regulator is used with an adapter. The output voltage at the trigger is 3 V. The insulators are used with a protective winding. The current overload indicator is not more than 5 A. On average, the sensitivity of the modulator does not exceed 10 mV. Current conductivity depends on the power of the modulator. For voltmeters, these devices are not suitable.
Batch Modifications
The switch (cam, batch) is made for measuring instruments. In this case, the modulator is used with an amplifier. The average current conductivity is 12 microns. Filters for models are installed both open and closed type. Transceivers in all devices are used without a cover.
Direct contacts are installed in the back of the case. Regulators for models are designed for two or three phases. Typically, triggers are applied with a switch. Their current overload indicator is 12 A. For pulse transformers, devices of this type are not suitable. How to connect a packet type switch? This can be done through a contact adapter.
Models for Transformers
Switches for transformers can be produced with a trigger. In this case, the modulators are used with a movable casing. Many models have a tetrode. It is installed together with insulators. To increase the switching speed, pass filters are used.
In devices with triggers, the current conductivity parameter is at least 6 microns. It is also important to note that the sensitivity of the modulators depends on the threshold voltage at the output contacts. If we consider modifications to 15 V, then they have the above parameter does not exceed 40 mV.
Characteristics of devices for voltmeters
Switches of this type are compact and often produced in three phases. Many models use an operational type modulator. The contacts in the device are located at the rear of the case. Many models use an expander. This element plays the role of a stabilizer.
To increase the conductivity of the current, tetrodes are needed. The specified parts from the trigger work. They can be connected through the lining or insulators. If we talk about indicators, it is important to note that the output threshold voltage of the switches is on average 20 V. The current conduction parameter with operational triggers does not exceed 14 microns. Filters in many devices are used without conductors.
Models for ammeters
The cam switch for ammeters is highly sensitive. Many modifications are designed for three phases. Triggers in devices are caught of a two-junction type. Expanders in this case play the role of a stabilizer. In many devices, operational modulators are used for ammeters. These elements can only work with kenotrons. To connect them, low-frequency adapters are used. The output voltage parameter on the trigger is about 12 V. It is also important to note that the current conductivity, as a rule, does not exceed 5 microns.
Double winding devices
The cam switch for dual-winding motors is pretty much in demand. On average, the output voltage parameter of the models is 3 V. Modulators in the devices use a pulse or operational type. Switched analogs are very rare.
Filters are used to stabilize the process of switching circuits. Many devices have protective tetrodes. These elements are installed through the conductor. The output frequency parameter for the models is 40 Hz. The sensitivity indicator fluctuates around 3 mV. However, if we consider modifications with two-digit triggers, then they have the above parameter is 5 mV.
ON Series Devices
This type of switch circuitry implies the use of an operational trigger. Modulators can be installed with a lining. In this case, transceivers are used without filters. Models are ideally suited for pulse transformers. Devices are available in two and three phases. If we consider the first option, then the expander is used switched type. In this case, the current conductivity parameter is about 6 microns.
The output voltage of the switches fluctuates around 12 V. If we consider devices in three phases, then they use a dipole expander. A distinctive feature of such devices is considered increased sensitivity. A model of this type can also be used for step-down transformers.
ON Series Devices
The switches in this series are only suitable for step-down transformers. Modulators in devices use a switched type. Regulators are installed in three phases. The contacts for the models are located in the rear of the case. Many modifications of this series are made without facing. Directly connecting the device through the expander. It is also important to note that devices with double-charged triggers are on the market. A distinctive feature of these devices is increased sensitivity. The threshold voltage of the modifications is 14 V.
On average, they have a current overload parameter of 3.5 A. In this case, the modulators are installed with insulators. There are also modifications with three-digit triggers. They are characterized by increased current conductivity. This type of device is suitable for low frequency transformers. The parameter of electricity consumption is low. How to connect the switch of this series? In fact, this can only be done through a contact adapter.
4G10 Series Devices
The cam switch 4G10 is suitable for both step-down and pulse transformers. The current conductivity parameter of the models is 6 microns. In this case, the operating frequency fluctuates around 45 Hz. Most of the modifications in this series work on phase expanders. Modulators with transceivers are suitable for such devices.
Regulators are often installed without a tetrode. The sensitivity parameter in them does not exceed 10 mV. It is also important to note that there are modifications on resonant expanders. Their distinguishing feature is a high current overload parameter.
The operating frequency of the models is about 55 Hz. The current conductivity of the models is 12 microns. The threshold voltage is 8 V. For power transformers, devices of this type are not suitable. There is a cam switch (market price) about 1500 rubles.