Connector failures in field equipment are frequently caused by underspecified current rating or insufficient mating cycles rather than by mechanical breakage.
Start from the continuous current per contact with the harness temperature rise considered, then apply a derating margin for multi-position housings where contacts sit close together.
Plating determines both contact resistance stability and cycle life. Gold flash suits low-cycle signal applications, while thicker gold or tin plating is preferred for connectors that are mated repeatedly during service.
Finally, confirm the mechanical retention method. Board locks, latching arms and strain relief features matter more in vibration-prone industrial enclosures than in stationary consumer products.
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