2980827

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Part Status:	Obsolete

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Solid State Relays

Introduction

Solid state relays (SSRs) are electric switches that are controlled by an external voltage instead of a mechanical spring or lever, as used in conventional relays. Electromagnetic relays require large spaces, high power consumption, and high characteristics, whereas solid state relays are much more compact and consume very low power. Examples of SSRs include optocouplers, triacs, and FETs, which work together to switch on and off power to loads within a given range of input voltage.

Application Field

Solid state relays are most commonly used in industrial applications for process temperature control, motor control, and process fluid control. SSRs provide reliable switching performance in harsh environments and are especially effective in applications that require high-temperature operation. SSRs are highly resistant to vibration, shock, and humidity, making them ideal for installations located in areas with extreme environmental conditions.SSRs are also used in automated machinery and robotics. The relays can be set to detect and respond to changes in voltage or a number of conditions, thereby allowing the machine to operate autonomously. In some cases, the relays can be used to detect and respond to input signals from sensors and other controllers.

Working Principle

The basic working principle of an SSR is that it turns on and off a circuit when activating and deactivating a solid state switch. This is done using two different types of components, an input device and an output device.The input device is connected to the control voltage or logic signal. This input device then passes the control voltage or logic signal to the output device, which switches on or off the load connected to it. The output device is typically an SCR (silicon-controlled rectifier) or a TRIAC (triode for alternating current). The SCR or TRIAC controls the current flow in the load.When the input device receives an activating control voltage or logic signal, it sends a signal to the output device which in turn turns on the connected load. The load will then remain on until the input device receives a deactivating control voltage or logic signal.

Conclusion

To summarize, solid state relays are electric switches that are activated and deactivated by external voltage. They are used in a variety of industrial applications for process temperature control, motor control, and process fluid control. Their small size, low power consumption, and high resistance to harsh conditions make them particularly useful in extreme environments. The way SSRs work is by activating and deactivating a solid state switch using two different components, an input device and an output device.

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