I always seem to be losing phoenix connectors.

I want to buy a bag of them to keep in the office as spares.

Are all phoenix connectors of the same size cross compatible ? Eg. could the same phoenix connector be used on a Lutron keypad, a multi zone audio amp ? (as long as they fit in the slot).

Or do they have other technical parameters i need to be aware of eg. voltage or other ?

  • 2
    \$\begingroup\$ The Phoenix Contact (note capitals) catalogues and sales support are excellent. Start there. \$\endgroup\$
    – Transistor
    Mar 22, 2021 at 20:34
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    \$\begingroup\$ I can say from experience that that are not all the same size. \$\endgroup\$
    – Ron Beyer
    Mar 22, 2021 at 20:39
  • \$\begingroup\$ @Transistor Phoenix is more a style than a brand name, there are compatible plugs from many different manufacturers. \$\endgroup\$ Mar 22, 2021 at 21:21
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    \$\begingroup\$ @Jasen what are they like? I've only ever seen the word phoenix in reference to the brand phoenix contact (or in reference to the mythical bird, but that's not relevant here.) \$\endgroup\$
    – Hearth
    Mar 22, 2021 at 22:44
  • \$\begingroup\$ @Hearth see photo in my answer, this is the style of pluggable terminal strip that Phoenix Contact seems most famous for. \$\endgroup\$ Mar 22, 2021 at 22:48

2 Answers 2


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There's a metric and a inch size, (3.5mm and 3.81mm pitch) that both look like the above, and also a 5.08mm that looks completely different. there are also variations with the barrels higher or lower on the plug body and versions with the cables at 90 degrees and the screws at 180 degrees and there's many different manufacturers making these connectors.

Plugs from different manufacturers are physically compatible so long as they are the right size.

Some plugs are rated for different maximum currents or voltages or temperature ranges etc if you need the guaranteed performance you should use the genuine connector.

If you have only modest needs like 2A at 24V and room temperature then you'll have no trouble mixing and matching

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    \$\begingroup\$ ‘Compatible’ but the mated performance can vary. Best to mate same brand with same brand especially if running close to the max specs. I can tell you that they are not all the same. \$\endgroup\$
    – Kartman
    Mar 22, 2021 at 22:17

It depends on the pitch:

There are two types of 3.5 mm terminal blocks: a) single cavity header; b) partitioned cavity header.

All others are compatible for a given pitch. For example, all 2.5 mm are compatible, and all 2.54 mm are compatible, but 2.5 mm and 2.54 mm ones look quite different.


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