Spdt Solid State Relay Schematic

A relay is an electrically operated switch it consists of a set of input terminals for a single or multiple control signals and a set of operating contact terminals the switch may have any number of contacts in multiple contact forms such as make contacts break contacts or combinations thereof.

Spdt solid state relay schematic.

Many relays use an electromagnet to mechanically operate a switch but other operating principles are also used such as solid state relays. Spdt 1 form c solid state relays are available at mouser electronics. Relays are used where it is necessary to control a circuit by an independent low power signal. So basically you can see the spdt relay as a way of switching between 2 circuits.

In this article we will briefly discuss the ssr solid state relay its construction operation schematics different types of ssr relays based on its switching property and input output forms we will also discuss the advantages disadvantages of solid state relay ssr comparing to electromagnetic. What is solid state relay. A simple high current spdt solid state dc relay or a dc ssr can be constructed using a couple of mosfets and an optocoupler as shown in the digaram above. What do spst spdt dpst and dpdt mean.

The idea looks self explanatory. One can be normally closed and the other one is opened or it can be normally open and the other one closed. Mouser offers inventory pricing datasheets for spdt 1 form c solid state relays. Relay is a electro mechanical switch used to control high power application through low power signal electronic circuits for an example a simple timer circuit working under 5v dc bias can not control high voltage light bulb by introducing relay component we can easily control light bulb.

Construction operation applications types of ssr relays. Pole refers to the number of circuits controlled by the switch. Typical relay typical relay contains electromagnetic coil n o contact n c contact and common contact. Relays are used where it is necessary to control a circuit by a low power signal with complete electrical isolation between control and controlled circuits or where several circuits must be controlled.

All the switch component mosfet scr triac igbt etc in the solid state relay only acts as a spst switch and there is no single component in the solid state relay that has the spdt function besides the opto coupler with optoelectronic isolation feature is used in the normal solid state relay as the signal transmission component so the input control circuit of the ssr switch is. It has one common terminal and 2 contacts in 2 different configurations. Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw. Dp switches control two independent circuits and act like two identical switches that are mechanically linked.

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