Electronic – Identification: what type of connector does the pictured socket take

connector

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

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Best Answer

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