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Electrical Symbols — Switches and Relays

In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. The mechanism of a switch may be operated directly by a human operator to control a circuit (for example, a light switch or a keyboard button), may be operated by a moving object such as a door-operated switch, or may be operated by some sensing element for pressure, temperature or flow. A relay is a switch that is operated by electricity. Switches are made to handle a wide range of voltages and currents; very large switches may be used to isolate high-voltage circuits in electrical substations.

Electrical Symbols — Switches and Relays

Pic. 1. Switches and Relays Library

ConceptDraw DIAGRAM is a powerful software for creating professional looking electrical diagram quick and easy. For this purpose you can use the Electrical Engineering solution from the "Industrial Engineering" area of ConceptDraw Solution Park.

Electrical Engineering Solution for ConceptDraw DIAGRAM provides the stencils libraries of ready-to-use predesigned 926 vector symbols, templates and samples that make your electrical drawing quick, easy and effective.

26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM make your electrical diagramming simple, efficient, and effective. You can simply and quickly drop the ready-to-use objects from libraries into your document to create the electrical diagram.

Electrical Symbols

Pic. 2. Electrical Engineering symbols

Electrical diagram software will assist you in drawing your electrical diagrams with minimal effort and makes it very easy for beginners. Electrical symbols and smart connectors help present your electrical drawings, electrical schematic, wiring diagrams and blue prints.

Electrical Symbols — Switches and Relays *

Pic. 3. Electrical Symbols — Switches and Relays

Most of the electrical symbols can be changed in their appearance, styles and colors according to users' requirements. Electrical symbols are used to represent various electrical and electronic devices in a schematic diagram of an electrical or electronic circuit.

The following table lists some switches and relays electrical symbols in our electrical diagram software.

Symbol Meaning
Electrical Symbols — Switches and Relays
Make contactMake contact
Break contactBreak contact
Two way contactTwo way contact
Passing make-contactPassing make-contact
Spring returnSpring return
Stay putStay put
Limit switchLimit switch
Circuit breakerCircuit breaker
Spring return 2Spring return 2
Spring return 3Spring return 3
Limit switch n/oLimit switch n/o
Limit switch n/cLimit switch n/c
2 position switch2 position switch
3 position switch3 position switch
4 position switch4 position switch
Manual switchManual switch
Pushbutton makePushbutton make
Pushbutton breakPushbutton break
Pushbutton 2-circuitPushbutton 2-circuit
Selector switchSelector switch
Shorting selectorShorting selector
Proximity limit switchProximity limit switch
Time delay makeTime delay make
Time delay breakTime delay break
Time delay make 2Time delay make 2
Time delay break 2Time delay break 2
Safety interlockSafety interlock
Flow actuatedFlow actuated
Liquid level actuatedLiquid level actuated
Liquid level actuated 2Liquid level actuated 2
Gas flow actuatedGas flow actuated
Pressure actuatedPressure actuated
Temperature actuatedTemperature actuated
Temperature switchTemperature switch
Inertia switchInertia switch
Mercury switchMercury switch
Mercury switch 2Mercury switch 2
Switch disconnectorSwitch disconnector
Change-over contactChange-over contact
Relay, alternating-currentRelay, alternating-current
Relay, magnetically polarizedRelay, magnetically polarized
Relay, slow-operateRelay, slow-operate
Relay, slow-releaseRelay, slow-release
Relay, high speedRelay, high speed
Relay, mechanically latchedRelay, mechanically latched
Relay, permanentRelay, permanent
Relay coilRelay coil
Relay contactsRelay contacts
Pilot lightPilot light
Pilot light, push-to-testPilot light, push-to-test

A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.

How to Create an Electrical Diagram Using Switches and Relays Library

  • Open ConceptDraw DIAGRAM new document page.
  • Select libraries from Electrical Engineering section.

    Libraries from Electrical Engineering section

  • Switches and relays library contains objects, identified by a blue tile in the library pane. Such objects can be edited by using the Action button menu. To open the menu select an object and click the Action Button button in the upper right corner of the object. Action button menu
  • Select the Smart Connector tool Smart Connector. To connect elements using this tool, drag the connector from one connect dot to another.You can use Layers to place connections on different layers.
  • Result: Circuit Diagram.

    Electrical Diagram


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Network infrastructure planning is a very important process in the network construction, and the share of time allocated to this within the scope of the entire project may reach 60-80%. A competent and thorough approach to planning contributes to the quick investment return, and also increases the reliability and flexibility of the final system, reducing the probability of additional costs related to the incorrect implementation. Any planning begins with an analysis of the business requirements to the final system. Basic network parameters, which should be assessed are the scalability, accessibility, cost, speed and safety. Speed and cost are often mistaken for the most important parameters, and the rest of the parameters aren't even remembered. This is not entirely correct. Initially, it is necessary to assess the business plans for the future, because sometimes it is more profitable to invest more money in the beginning. If the business is to develop, then, consequently, demands onCisco Routers
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Electrical Symbols — MOSFET →

The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of transistor used for amplifying or switching electronic signals. Although the MOSFET is a four-terminal device with source (S), gate (G), drain (D), and body (B) terminals, the body (or substrate) of the MOSFET is often connected to the source terminal, making it a three-terminal device like other field-effect transistors. Because these two terminals are normally connected to each other (short-circuited) internally, only three terminals appear in electrical diagrams. The MOSFET is by far the most common transistor in both digital and analog circuits, though the bipolar junction transistor was at one time much more common. 26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM make your electrical diagramming simple, efficient, and effective. You can simply and quickly drop the ready-to-use objects from libraries into your document to create the electrical diagram.Electrical Symbols — MOSFET *
Picture: Electrical Symbols — MOSFET
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Electrical Symbols, Electrical Schematic Symbols →

ConceptDraw DIAGRAM diagramming and vector drawing software enhanced with Electrical Engineering Solution from the Industrial Engineering Area of ConceptDraw Solution Park offers you powerful tools and libraries with incredibly large quantity of predesigned electrical symbols as electrical schematic symbols for easy designing professional looking Electrical Schematics.Electrical Symbols, Electrical Schematic Symbols *
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Electrical Symbols — Integrated Circuit →

An integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small plate ("chip") of semiconductor material, normally silicon. This can be made much smaller than a discrete circuit made from independent electronic components. ICs can be made very compact, having up to several billion transistors and other electronic components in an area the size of a human fingernail. 26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM make your electrical diagramming simple, efficient, and effective. You can simply and quickly drop the ready-to-use objects from libraries into your document to create the electrical diagram.Electrical Symbols — Integrated Circuit *
Picture: Electrical Symbols — Integrated Circuit
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Use the ConceptDraw DIAGRAM software that has vector clipart of numerous cable connectors, examples, and templates for drawing different types of audio and video connection diagrams. Paste icon of the receiver or another device to page and layout sockets and plugs. Further connect plugs with each other, and now you have well-designed connection diagram.How to Make Audio and Video Connections *
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This diagram represents the electrical floor plan. This is a common practice - to draw the electrical plan on the floor plan. The outlets, fixtures and other electrical equipment are depicted on the floor plan with special symbols. This drawing was created using the possibilities of ConceptDraw DIAGRAM as CAD software. Computer-aided design software is intended to replaces manual engineering drafting with an automated process. CAD software is used by engineers, architects, and others to make high-precision technical drawings and illustrations. CAD software allows technical specialists to develop, examine and manage various engineering projects. It is almost impossible nowadays to imagine mechanical engineering without digital technologies. Finding a suitable CAD software for creating mechanic diagram and electrical diagram architectural designs can take a lot of time and effort. However, with ConceptDraw DIAGRAM you can create any diagram that you want and later convert it to the most popular graphic formats like.vsdx,.png,.pptx etc.ConceptDraw DIAGRAM software for making mechanic and electrical diagrams for architectural design
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Cross-Functional Flowchart →

There are many tools to manage a process or to illustrate an algorithm or a workflow. Flowcharting is one of those tools. However, it may be difficult to show complex processes that require multiple attributes or several people in a simple flowchart, so a cross-functional flowchart would be a solution for that situation. To create such flowchart, group processes and steps to labeled rows or columns, and divide those groups with horizontal or vertical parallel lines. It is worth mentioning that there are different types of cross-functional flowcharts, like opportunity or deployment flowchart. This diagram shows a cross-functional flowchart that was made for a trading process. It contains 14 processes, distributed through 5 lines depicting the participants who interact with the process. Also there are connectors that show the data flow of information between processes. The cross-functional flowchart displays a detailed model of the trading process, as well as all participants in the process and how they interact with each other. The lines in the flowchart indicates the position, department and role of the trading process participants.Cross-Functional Flowchart
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A circuit diagram or wiring diagram uses symbols to represent parts of a circuit. Electrical and electronic circuits can be complicated. Making a drawing of the connections to all the component parts in the circuit's load makes it easier to understand how circuit components are connected. Drawings for electronic circuits are called "circuit diagrams". Drawings for electrical circuits are called "wiring diagrams". 26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM make your electrical diagramming simple, efficient, and effective. You can simply and quickly drop the ready-to-use objects from libraries into your document to create the electrical diagram.Electrical Symbols — Electrical Circuits *
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