Retractable lead systems

A retractable lead system comprising:

• a cup disposed proximate a vacuum end of the retractable lead system, the cup defining a cavity and a contact reception seat;
• a seated contact disposed within the contact reception seat, the seated contact configured to be electrically coupled to an interior lead disposed within a vacuum environment;
• a plunger comprising an ambient contact and a retractable contact disposed on opposite ends of the plunger, the ambient contact disposed proximate an ambient end of the retractable lead system, the plunger configured to be actuated between an open position at which the retractable contact is retracted from the seated contact and a closed position at which the retractable contact is coupled with the seated contact;
• and
• a sealing member configured to be disposed a distance from a vacuum end plate disposed proximate a boundary of the vacuum environment and having an opening through which the plunger passes, the plunger moving relative to the vacuum end plate when moved between the open and closed positions.

A retractable lead system comprising:

• a cup disposed proximate a vacuum end of the retractable lead system, the cup defining a cavity and a contact reception seat;
• a seated contact disposed within the contact reception seat, the seated contact configured to be electrically coupled to an interior lead disposed within a vacuum environment;
• a plunger comprising an ambient contact and a retractable contact disposed on opposite ends of the plunger, the ambient contact disposed proximate an ambient end of the retractable lead system, the plunger configured to be actuated between an open position at which the retractable contact is retracted from the seated contact and a closed position at which the retractable contact is coupled with the seated contact;
• a drive stud and drive nut, the drive stud coupled to the plunger, and
• a resiliently biasable spring assembly disposed radially about the drive stud.