An electrical connector system has two connectors, one of which is included in a module mateable with the other connector in a pluggable manner. The other connector includes a body and two or more electrical contacts. The body of that electrical connector includes a spring that provides a combined lock-down force and kick-out force. The lock-down force biases the module against the other connector, thereby providing a secure electrical and mechanical connection. The kick-out force biases the module away from the other connector to separate or eject the module when a user actuates a release mechanism. The module also includes a slot that engages a projection on the other connector to promote alignment of the mating electrical contacts.