![]() ![]() We made a dedicated guide on different types of relays. We listed out some of the common types of relays here. Relays can be classified into different types depending on their functionality, structure, application etc. The switching action between contacts for all these relays is performed when the coil get energized. In motor direction control, these are used for phase or polarity reversal. Double pole double throwĪ DPDT (double pole double throw) relay has two poles and two throws for each pole. For example, this relay is used for connecting both phase and neutral terminals to the load at a time. ![]() ![]() Double pole single throwĪ double pole single throw relay has two poles and single throw and it can be used to connect two terminals of a single circuit at a time. Though the SPDT has two output positions, it may consist of more than two throws depends on the configuration and requirement of the application. This relay is also called as changeover relay. Single Pole Double ThrowĪ single pole double throw relay connects one input circuit to one of the two outputs. It is used for the applications which require only ON or OFF state. Number of circuits a relay connects is indicated by throws.ĭepending on the poles and throws, relays are classified intoĪ single pole single throw relay can control one circuit and can be connected to one output. Each switch in relay is referred as pole. Depending on the number of contacts and number of circuits it switches relays can be classified.īefore we know about this classification of contacts we have to know the poles and throws of a relay switch. The terminology “Poles and throws” is also applicable for relay. Relay Contact TypesĪs we have seen that relay is a switch. Solid state relays will have sensing element to sense the input voltage and switches the output using opto-coupling. exactly to opposite to the above shown relay. There are also such relays, whose contacts are initially closed and opened when there is supply i.e.
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