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enter image description here

(It's not on the wiki page for electronic symbols, or this sparkfun page with lots of symbols.)

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  • 3
    \$\begingroup\$ Could it be a light bulb? In what context have you seen this? \$\endgroup\$ Jul 20, 2021 at 20:21
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    \$\begingroup\$ I guess it's possible. +24 V DC --> contactor relay --> this --> 0V \$\endgroup\$
    – DJG
    Jul 20, 2021 at 20:25
  • \$\begingroup\$ Blinker, maybe? \$\endgroup\$ Jul 20, 2021 at 20:34
  • \$\begingroup\$ This is closest to an IEEE symbol for a terminal (as in connector type). Without context, hard to say. Unfortunately, people are ignoring standard symbols and reference designators (fighting this at work) and making up their own. \$\endgroup\$
    – qrk
    Jul 20, 2021 at 20:40

1 Answer 1

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  • The symbol is for a lamp (with rays of light eminating from it).
  • The 'B' is, most likely, for 'blue'. This would be typical for an industrial machine reset button.
  • The dotted line would usually be connected to a switch contact indicating that the lamp is part of an illuminated button.

I can't find a reference for the symbol but it's quite common on American machine ladder schematics that I have seen.

enter image description here

Figure 1. Indicator lamps on a ladder diagram. Image source: All About Circuits.

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  • \$\begingroup\$ This is correct. Used for many years in industry. \$\endgroup\$
    – Marla
    Jul 20, 2021 at 21:03

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