Hello, readers welcome to the new post. Today we will learn Introduction to SPDT Relay. A relay is a type of electronic switch. It consists of control signals and input signals like other circuits. The control also has electric circuitry with a coil wounded about the soft iron core that controls it. Switch get the input signal through the liver power source through control connections and then regulate output.
There are different types of relays are used in circuits. In this post, we will cover the different points and get the details about the SPDT relay. So let get started Introduction to SPDT Relay
Introduction to SPDT Relay
- The full form of SPDT is single pole double-through. It is commonly used in modern circuits due to its inner structure
- It has 5 control points. That consists of TWO electromagnetic relay coils, one CM, one N/C, and one normally open terminal.
- This terminal of the relay is called contacts. This terminal of this relay explains that it has 2 different arrangements that make it different from other relays.
- If there is continuous power is given to a coil of wire wrapped around a solenoid, normally open and standard terminals become charged.
- If there is no current passing through the coil, the magnetic circuit not operating the common terminal and is normally closed get connected
Spdt Relay Working
- There are 2 types of electrical connections for the SPDT relay.
- Here below are two circuits showed that explain the working of SPDT.
- The first part of the circuitry shows that the circuit has no dc current through the single foil. As a result T terminal connects the first contact that gives contact resistance. In this configuration, dc current passes through one fan but not the other.
- While for 2nd in circuit current passing through the electromagnetic coil. When the T terminal makes a connection with point two current passing through the first fan and which makes open point two. As a result, the T terminal makes a connection with the two giving contact resistance.
- So current passing through the second fan but not from the first fan
- The correct operating feature of SPDT is the ability of a relay switch among two magnetic circuits.
How to Connect Spdt Relay in the Circuit
- There are five coils of terminal connections this relay has. That are 2 insulated coils, common point, normally open terminal, and normally closed point.
- One insulated coil is one-sided of the circuitry and another coil is another part of the circuitry. These terminals are points where the input supply is given. During the application of input, power polarity can cause some problems. Through the connection of power to these relay points close the witch
- In this condition, polarity has not a problem. It must operate because one point is positive voltage and the other is negative.
Configuration of SPDT Terminals
- N/O called normally open point. With this terminal devices are connected that need power. The device will be off till the relay is out of magnetic flux value.
- N/C is normally a closed switch. It operates opposite to the normally open terminal. Its operation is to connect the powered device with this point when no current passes through the magnetic coil.
- COM is a common terminal that is the main feature of the relay. it is the point where the first portion of the circuitry is connected. THrough if the relay does not have any first portion this point can be opened.
- Through some noticeable exist when the relay is in the magnetic field and the switch is closed. Both COM and N/O have continuous currents.
Difference between SPDT Relay and DPDT Relay
- The full form of SPDT is single pole double through and DPDT is double pole double through. DPDT can be used in place of SPDT. Some points discussed that making differences between them
- SPDT has 3 pinouts and DPDT has six pinouts
- SPDT has two circuits and DPDT has six
- Single circuit mechanism for SPDT and double for dpdt
- DPDT can do power on or off at a same time and SPDT performs one function at one time
That is all about the SPDT Relay all points has explained. If you have any query ask here