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The picture was taken off an equipment we are trying to connect to. Unfortunately the connector type was not specified in user manual.

The closest one I can find based on shape is molex 4 pin female connector, or 4 pin peripheral connector used to send power to CD/hard drive in desktops.The difference is, molex connectors have flat sides, while the socket in picture has curves around each pin.

Could anyone offer some clue?

enter image description here

enter image description here

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    \$\begingroup\$ Pluggable terminal block. Probably something like one of these. \$\endgroup\$ – brhans Jun 11 '19 at 19:40
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Thats a terminal block header probably the same one shown below:
enter image description here
Source: https://www.digikey.com/product-detail/en/on-shore-technology-inc/OSTOQ045451/ED2830-ND/1588283

The terminal block plug can be found below

enter image description here
Source: https://www.digikey.com/product-detail/en/on-shore-technology-inc/OSTTS04515A/ED2863-ND/1588621

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That is a Camdenboss CTBP9350/4 (or equivalent). The mating plugs are:

  • CTBP9200/4
  • CTBP92VG/4R

They are available from all major distributors (Farnell, RS, Digikey, Mouser, Arrow, etc..).

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    \$\begingroup\$ thank you so much.Have been searching for it the whole morning. Remember seeing them here or there, but the name always evades me. \$\endgroup\$ – Zhiyong Li Jun 11 '19 at 19:43
  • \$\begingroup\$ My pleasure, we use a lot of them on control equipment. Customers love that you can wire them, then connect them. As opposed to standard screw-terminals which can be awkward. \$\endgroup\$ – Cursorkeys Jun 11 '19 at 19:45
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These connectors are most known from the Phoenix Contact Combicon family.
The shown socket mates with MSTB 2,5 HC/ 4-STF (1912090), however the metal plating inhibits the locking screws. So use MSTB 2,5 HC/ 4-ST (1911871).

That is assuming it's 5 mm. If it's 5.08 mm then add "-5.08".
However with a 4 pin you can just use more force...

Or get any of the other terminations they offer, they have a lot of choice. (eg: straight/angled or cage/spring)

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