● The thicker the wire, the less the current is reduced due to internal resistance, allowing higher current to be supported. Moreover, because the resistance is decreased by using a thick wire, it's possible to reduce the generation of heat. In addition, the wire also has a role in expelling heat from inside the connector.
● Connectors generally have a great number of circuits (number of cores), so the carried current becomes reduced. Also, the higher the ambient temperature, the more the carried current will be reduced. (See graph)