The red housing gives a visual cue on the harness for polarity or circuit identification.
This receptacle mates with standard MTA-100 headers — the 0.100" pitch and locking ramp are the same across the series, so any 0.100" unshrouded header with the matching position count will engage. The IDC termination accepts 22 AWG wire, either discrete or ribbon, and the closed-end feature means the first cavity is blocked, forcing correct pin-one alignment during mass termination.
If you need a drop-in replacement from the same series, the MTA-100 line includes active 5-position IDC receptacles with tin or gold plating; verify the contact finish and RoHS status against your assembly requirements.