AQY211EHA

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Solid State Relays

A solid state relay (SSR) is an electronic switching device composed of a solid-state mechanism, which enables it to control the current through the circuit without direct opening or closing of the circuits. In other words, it is an electrically controlled mechanical switch with no mechanical components. SSRs are typically used to save energy, reduce power consumption, reduce noise and improve the speed and reliability of electronic systems. AQY211EHA is one of the most popular solid state relay, which is widely used in many fields.

AQY211EHA Application Field

AQY211EHA is a four pin outlet, designed for general DC loads, providing good coupling and transformer isolation. It is widely used in temperature control systems, motor speed control systems, power measurement and control systems, factory automation control systems, automatic doors control systems, etc. This SSR is suitable for AC-DC or DC-DC control, and it can provide protection against over-voltage, overload and short circuit. Aquy211EHA has a temperature monitoring device for overload protection and is suitable for switching up to 8A.

Working Principle

An AQY211EHA solid state relay has an electronic control circuit that is connected to the input of the SSR. This control circuit is generally a triac, a type of thyristor, or a two- or three-terminal controller IC which allows the user to regulate the switching of the thyristors as desired. When the control circuit is actuated, it triggers the operation of the SSR. The thyristor switches, connecting the output to the load and the current flows, thereby controlling the circuit.

The AQY211EHA solid state relay is a non-contact type of relay containing an actuation circuit, made up of an optocoupler. The optocoupler is an important component of the actuation circuit, which includes a LED and a photodiode. When the input voltage is applied at the input side of the SSR, the LED starts emitting light, which is received by the photodiode. This then creates a flow of current through the photodiode which eventually triggers the switching of the thyristors.

AQY211EHA is also provided with some protection features, such as reverse connection and over-voltage protection, which are designed to protect the SSR from hazardous conditions. The reverse connection protection ensures that the SSR is not damaged even if the input wires are connected in reverse polarity. The over-voltage protection, on the other hand, prevents the output of the SSR from damage due to excessive input voltage.

Conclusion

AQY211EHA is a four pin solid state relay specifically designed for general DC loads. It is widely used in various fields such as temperature control systems, motor speed control systems, power measurement and control systems, factory automation control systems, etc. AQY211EHA is a non-contact type of relay containing an actuation circuit, made up of an optocoupler, which creates a flow of current through the photodiode and eventually triggers the switching of the thyristors. This SSR is also provided with protection features such as reverse connection protection and over-voltage protection to protect it from particular hazardous conditions.

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