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In Lucidchart, there are four major types of relay symbols that are labeled. They include both the full name, e.g. Single Pole Single Throw, and its abbreviation—in this case, SPST. You can easily rotate a relay, or any other icon in Lucidchart, to fit the parameters of your circuit diagram.
- How to Create a Circuit Diagram
7. Add components to your diagram as needed. Be sure to...
- How to Create a Circuit Diagram
SPST Switch: The Single Pole Single Throw (SPST) switch is one of the most common switch symbols used in relay diagrams. It consists of a simple on/off switch, with two terminals that can be connected or disconnected.
A single-pole, single-throw relay with a normally-closed (NC) switch contact would be represented in an electronic schematic like this: In the electrical control world, the labels “Form-A” and “Form-B” are synonymous with “normally open” and “normally closed” contacts, respectively.
This is the diagram below to learn all the pin terminals of a Single Pole Single Throw (SPST) Relay: The 2 COIL terminals is where the voltage is placed in order to energize the coil. Place the relay's rated coil voltage on these terminals. The polarity of the voltage does not matter.
One of the most commonly used switch symbols is the SPST (Single Pole Single Throw) switch, represented by a simple line that connects or disconnects the circuit when activated. This type of switch has only one input and output and is often used for simple on/off functions.
Thus in circuit diagrams and schematics, graphical symbols identify and represent electrical and electronic devices and show how they are electrically connected together while drawing lines between them represents the wires or component leads.
A Single Pole Single Throw Relay comes with four terminal points. The terminals are COIL, COIL, COM, and N.O. This correlates to the following in the relay: Terminal Descriptions. -COIL - This is one end of the coil. COIL - This is the other end of the coil.
