A cam switch is a device that is designed to switch electrical circuits. The principle of operation of the device is based on changing the clock frequency. Most often, switches are found in transformers. They are also actively used in measuring instruments. In order to learn more about the switches, it is necessary to consider the scheme of the usual modification.
Model diagram
The switch circuit contains moving type contacts and a switch. Directly the handle is fixed on the trigger. Tetrodes are used to change the position of the contacts of the device. The regulator is installed together with the modulator. Filters are used to stabilize the underfrequency.
Two-pin devices
Two-pin cam switch ideal for pulse transformers. In this case, the regulator is used with an adapter. Output voltage attrigger is 3 V. Isolators are used with a protective winding. The current overload indicator is not more than 5 A. On average, the modulator sensitivity does not exceed 10 mV. The current conductivity depends on the power of the modulator. These devices are not suitable for voltmeters.
Batch modifications
The switch (cam, batch) is made for measuring instruments. In this case, the modulator is used with an amplifier. On average, the current conductivity indicator is 12 microns. Filters for models are installed both open and closed. Transceivers in all devices are used without lining.
Directly the contacts are installed in the back of the case. Regulators for models are designed for two or three phases. As a rule, flip-flops are used with a switch. Their current overload indicator is 12 A. Devices of this type are not suitable for pulse transformers. 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, modulators are used with a movable plate. Many models have a tetrode. It is installed with insulators. Pass-through filters are used to increase the switching speed.
In devices with triggers, the current conductivity parameter is at least 6 microns. It is also important to note that the sensitivity of modulators depends on the threshold voltage at the output pins. If we consider modifications to 15 V, then their 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. Contacts in the device are located in the back of the case. Many models use an expander. This element plays the role of a stabilizer.
Tetrodes are needed to increase current conductivity. The specified parts work from the trigger. They can be connected through a 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 conductivity parameter with operational triggers does not exceed 14 microns. Filters in many devices are used without conductors.
Models for ammeters
The ammeter cam switch is highly sensitive. Many modifications are designed for three phases. The triggers in the devices are of the two-transition type. Expanders in this case play the role of a stabilizer. In many devices for ammeters operational modulators are used. These elements are able to work only 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.
Devices for double winding motors
Cam switch fortwo-winding motors is quite in demand. On average, the output voltage parameter for models is 3 V. Modulators in devices are used of a pulsed or operational type. Switched counterparts are very rare.
Filters are used to stabilize the circuit switching process. Many devices have protective tetrodes. These elements are installed through the conductor. The output frequency parameter for 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 of 5 mV.
ON series devices
The circuit of this type of switch implies the use of an on-line trigger. Modulators can be installed with lining. In this case, the transceivers are used without filters. For pulse transformers, the models are ideal. Devices are available for two and three phases. If we consider the first option, then the expander is used as a 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 three-phase devices, they use a dipole expander. A distinctive feature of such devices is considered to be increased sensitivity. This type of model 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 are used of a switched type. Regulators are installed on three phases. Contacts for models are located in the rear of the case. Many modifications of this series are produced without lining. Direct connection of the device occurs through the expander. It is also important to note that there are devices on the market with dual-charge triggers. A distinctive feature of these devices is increased sensitivity. The threshold voltage of modifications is 14 V.
On average, their current overload parameter is 3.5 A. In this case, modulators are installed with insulators. There are also modifications with three-bit triggers. They are characterized by high electrical conductivity. Devices of this type are suitable for low-frequency transformers. Their 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
Cam switch 4G10 is suitable for both step-down and pulse transformers. The current conductivity parameter for models is 6 microns. In this case, the operating frequency fluctuates around 45 Hz. Most modifications of this series work on phase expanders. Modulators with transceivers are suitable for such devices.
Regulators are often installed without a tetrode. Their sensitivity parameter does not exceed 10 mV. It is also important to note thatthere are modifications on resonant expanders. Their distinguishing feature is the 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. Devices of this type are not suitable for power transformers. The cam switch costs (market price) about 1500 rubles
