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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1\$\begingroup\$ Probably 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. \$\endgroup\$– AnalogKidCommented Dec 23, 2020 at 17:52
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1\$\begingroup\$ Looks like a diode. \$\endgroup\$– StainlessSteelRatCommented Dec 23, 2020 at 17:54
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1\$\begingroup\$ Not a diode....black line wouldn't be in the center. Agree its probably a transorb \$\endgroup\$– Kyle BCommented Dec 23, 2020 at 18:02
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\$\begingroup\$ @AnalogKidThanks! Can it be replaced with a normal Zener diode? \$\endgroup\$– DarkkahnCommented Dec 23, 2020 at 19:19
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1\$\begingroup\$ Mistakenly connected to mains. Oh my. \$\endgroup\$– user57037Commented Dec 23, 2020 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
answered Dec 23, 2020 at 19:51
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\$\begingroup\$ Interesting, they look almost identical. So it's some kind of varistor. Thanks for the help! \$\endgroup\$– DarkkahnCommented Dec 24, 2020 at 17:40