This component was on a telephone that was mistakingly connected to the mains rather than the phone line. Any help would be appreciated!
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1Probably not a zero-ohm resistor, as I've never seen one in a glass package. Could be a bi-directional transient absorber, basically a back-to-back zener diode. – AnalogKid Dec 23 '20 at 17:52
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1Looks like a diode. – StainlessSteelRat Dec 23 '20 at 17:54
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1Not a diode....black line wouldn't be in the center. Agree its probably a transorb – Kyle B Dec 23 '20 at 18:02
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@AnalogKidThanks! Can it be replaced with a normal Zener diode? – Darkkahn Dec 23 '20 at 19:19
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Looks eerily similar to some spark gap's I've seen in some SMPS. – Unimportant Dec 23 '20 at 19:47
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1Mistakenly connected to mains. Oh my. – user57037 Dec 23 '20 at 20:06
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It looks very similar to some spark gaps I've seen used on switch mode power supplies.
There is a post on this forum that confirms this: Spark gap schematic symbol help
Unimportant
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Interesting, they look almost identical. So it's some kind of varistor. Thanks for the help! – Darkkahn Dec 24 '20 at 17:40