Series:	GN
Packaging:	Bulk
Part Status:	Active
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC
Voltage - Input:	4 ~ 32VDC
Voltage - Load:	48V ~ 660V
Load Current:	25A
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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Solid State Relays and their Application Field and Working Principle

Solid state relays (SSRs) are special electronic switching devices that use solid-state semiconductor technology to achieve control. They are switches that can switch on or off an electric circuit without the need for a mechanical contact. SSRs have been developed to replace conventional mechanical relays to control circuits of higher current and voltage applications. There are different types of SSRs and each is designed to perform a particular type of function specifically for its application field.

What are Solid State Relays?

A solid state relay (SSR) is an electronic switching device that operates as a switch without having to use mechanical contacts. It has a transistor and an opto coupler (optical isolator) which control the switching of the relay. SSRs have become popular over conventional mechanical relays due to their faster operation time, long life cycle, and immunity to vibration, shock, noise, and other environmental disturbances.

Types of SSRs

There are various types of SSRs that are appropriate for different applications. Here are some common SSRs and their working principles: • DC (Direct Current) SSRs: These are relays specifically designed for controlling circuits carrying direct current. They have an SCR (silicon control rectifier) or a MOSFET (metal–oxide–semiconductor field-effect transistor) as the switching element. • AC (Alternating Current) SSRs: These relays have an optocoupler, thyristor, or a TRIAC as the switching element. They are used for controlling circuits carrying alternating current. • Zero-Crossing SSRs: These SSRs switch at the zero-crossing point of the AC signal. This ensures that no arcing or sparking occurs when the relay is turned on or off. • Dynamic SSRs: Dynamic SSRs (also known as time-delay SSRs) are used in applications where time delay of the unloaded power circuit is desired.• Programmable SSRs: Programmable SSRs are microcontrollers-based relays and have individual input circuits that can be programmed to change their turn-off and turn-on times depending on the application.• Reverse Polarity SSRs: These relays are specifically designed to withstand reverse polarity in high voltage applications.

Application benefits of Solid State Relays (SSRs)

SSRs offer various application benefits that are not provided by mechanical relays. Here are some of the advantages of using SSRs: • SSRs have very fast switching times, usually in the thousandths of a second.• They have longer life cycles and can often switch billions of times without any problems. • SSRs are also more reliable than mechanical relays and are not affected by shock, vibration, noise, heat, or other environmental disturbances. • SSRs also draw very little current from input circuits and do not cause contact arcing or sparking. • They are also much more precise in controlling the timing and switching of the circuits.

Conclusion

Solid state relays are highly reliable, fast and precise electronic switching devices that have a variety of applications. They are used to control circuits carrying high current and voltage and can switch on and off in the thousandths of a second. SSRs are also very durable and are unaffected by environmental disturbances such as shock, vibration, noise, or heat.

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