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What type of switch would disconnect 3 separate lines? I just can't think of what it should be named.

If possible a suggestion of a specific item would be welcome.

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    \$\begingroup\$ Other than a triple pole switch? \$\endgroup\$ – Ignacio Vazquez-Abrams Apr 12 '17 at 15:33
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    \$\begingroup\$ or a three pole switch (or more poles if you leave some unused!) \$\endgroup\$ – Neil_UK Apr 12 '17 at 15:34
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    \$\begingroup\$ TPST Switch.... \$\endgroup\$ – StainlessSteelRat Apr 12 '17 at 16:30
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A triple pole switch would be what you are looking for in this case. You could also use a single-pole triple-throw switch. Just take a look at the picture below:

Switch Types

You can use only one line at the time which I am assuming is what you would want to do. Look for relays that are triple-throw if you want more information.

But if you look to disconnect three lines at the same time, you would need to look for a triple-pole single-throw type of device. Take a look at the one shown below:

TPST/3PST Switch

This option would make more sense if you are trying to disconnect all the lines at the same time.

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    \$\begingroup\$ The last drawing answers the original question almost perfectly. And if you erase the short circuit on the top line, it would be perfect. ;-) \$\endgroup\$ – Mike Waters Apr 14 '17 at 19:03
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    \$\begingroup\$ @MikeWaters: Fixed. \$\endgroup\$ – MDTech.us_MAN Apr 15 '17 at 1:41
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Would a 3PDT do the trick? Three poles, two positions - on and off.

enter image description here

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    \$\begingroup\$ This would work with the info. OP gave. However, 3PST/TPST switches do exist, and are often less expensive while still fulfilling the requirement to "disconnect 3 lines." \$\endgroup\$ – Robherc KV5ROB Apr 12 '17 at 19:06

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