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Which type of connector is it?
DC, 4 pins, a plug (cable side, not board side) with 4 female sockets.
It resembles a Kycon 4-pin DC connector but reversed.
It is taken from FSP's AC/DC adapters and can also be found in several laptops.
Looks like it might be a female cable version of a snap and lock DC power connector
Edit: perhaps it's some sort of custom version of the KPJX-CM-4S?
Required, but never shown