Switch: labelled reference, US style

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Switch: labelled reference, US style, sheet 1 of 2

  1. Fig. 1

    12

    Switch (SPST)

    A switch symbol stands for a contact that either completes or breaks a path.

  2. Fig. 2

    12

    Push button, normally open

    The momentary push buttons shown here change contact state while pressed and return to their drawn, unactuated state when released.

  3. Fig. 3

    12

    Push button, normally closed

    Switch contacts are drawn in their normal status: the position they rest in with no force applied. A normally-open (NO) contact is drawn open and a normally-closed (NC) contact closed; for a momentary push button, normal means not pressed.

  4. Fig. 4

    COM12

    Switch (SPDT)

    Poles count the separate circuits a switch controls; throws count the contact destinations available to each pole. An off position is not an additional throw.

  5. Fig. 5

    COM11A1BCOM22A2B

    Switch (DPDT)

    Poles count the separate circuits a switch controls; throws count the contact destinations available to each pole. An off position is not an additional throw.

Notes

  1. The terminal key and the sources are on sheet 2.
Name
Class
Date
Sheet
1 of 2
Drawing
Switch Labelled reference
Style
US style
From
circuitsymbols.com
Licence
CC BY 4.0

Switch: labelled reference, US style, sheet 2 of 2

Terminal key
Fig.TerminalsWhat the terminal is
1–31, 2A single-pole, single-throw (SPST) switch has two terminals. Their left or right position on the page does not give them different electrical roles.
4, 5COM, COM1, COM2In a double-throw switch the common terminal is the one the moving arm belongs to.
4, 51, 2, 1A, 1B, 2A, 2BEach throw terminal is one of the positions the arm can connect the common terminal to.

Sources

  1. ModEL — Electrical Switches, §§3.1–3.3 (pp. 16–19), Tony R. Kuphaldt, retrieved 2026-09-22

Notes

  1. The Fig. numbers are those on sheet 1.
Name
Class
Date
Sheet
2 of 2
Drawing
Switch Labelled reference
Style
US style
From
circuitsymbols.com
Licence
CC BY 4.0