The JST LEXR-04V-S is a 4-position receptacle housing from the LEX series, designed as a free-hanging inline connector that accepts socket crimp terminals. It mates with the corresponding LEX series pin header to form a board-to-cable/wire interconnect.
Rated 3 A per circuit when terminated with 22 AWG wire — the current limit is tied directly to the wire size, so stepping down to a thinner gauge drops the ampacity. Voltage ceiling is 300 V, which covers most low-voltage DC rails and signal-level AC circuits inside an enclosure.
This housing takes a socket contact — the mating half is a LEX series pin header (same 0.098" pitch, same position count). Pick the contact plating (tin for cost-sensitive, gold for corrosion resistance or higher mating cycles) based on your environment — the housing doesn't care, but the contact does.