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Ssrs however employ semiconductor switching elements such as thyristors triacs diodes and transistors furthermore ssrs employ optical semiconductors called photocouplers to isolate input and output signals.
Solid state relay working principle. The relay may be designed to switch either ac or dc loads. Its role in the solid state relay is performed by a semiconductor or solid state device. Ssrs are not very different in operation from mechanical relays that have movable contacts. It can achieve switching on and off with no contact and no spark due to the switching characteristics of electrical element i e.
Ssrs solid state relays have no movable contacts. A solid state relay is an electronic switching device that switches on or off when an external voltage is applied across its control terminals. When the input signal is activated the internal zero crossing detector circuit triggers the triac to turn on as the ac load voltage crosses zero. A solid state relay is a non contact switch fully composed of solid state electrical element which can drive high current load with a small control signal.
It serves the same function as an electrom. Since the 4 20ma or 0 10vdc control input of the analog relay can be varied the output operates in accordance with the phase control principle. The load current is maintained by the triac s latching effect after the input signal is deactivated until the triac is turned off when the load voltage crosses zero. It consists of one input and output terminals.
Semiconductor components like switch transistor triac and so on. One is the ac solid state relay and the other is the dc solid state relay. To activate contacts it is necessary to have an activator. The principle of operation of a solid state relay is the closing or opening of contacts which transmit the voltage directly to the relay.
The inputs and the output of the relay are attached to the specified terminals. The transfer function is linearized and reproducible. When a specific control signal is provided to the input terminals of the solid state relay the on and off function on the output terminal is performed accordingly and after. The relay is equipped with a built in synchronization circuit in order to achieve phase angle control.
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