Spdt Solid State Relay Schematic

So basically you can see the spdt relay as a way of switching between 2 circuits.

Spdt solid state relay schematic.

Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw. Many relays use an electromagnet to mechanically operate a switch but other operating principles are also used such as solid state relays. 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. In an absence of an external trigger the lower mosfet stays switched off allowing the upper mosfet to conduct through the 10k resistor connected across the.

Typical relay typical relay contains electromagnetic coil n o contact n c contact and common contact. Pole refers to the number of circuits controlled by the switch. One can be normally closed and the other one is opened or it can be normally open and the other one closed. What do spst spdt dpst and dpdt mean.

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. Construction operation applications types of ssr relays. Sp switches control only one electrical circuit. 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.

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. The idea looks self explanatory. What is solid state relay. Dp switches control two independent circuits and act like two identical switches that are mechanically linked.

Spdt 1 form c solid state relays are available at mouser electronics. It has one common terminal and 2 contacts in 2 different configurations. 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. When there is.

The single pole double throw spdt relay is quite useful in certain applications because of its internal configuration.