Switching device having an actuation unit, on-board electrical system and motor vehicle

An on-board electrical system for a motor vehicle, comprising:

• at least two on-board electrical system components;
• at least one supply line electrically connecting the at least two on-board electrical system components;
• and
• at least one switching device comprising an electromechanical switch which is configured to connect and interrupt the at least one supply line, wherein the electromechanical switch comprises:
• a stationary first switching contact,
• a movable second switching contact,
• an actuation unit which has a mechanical force-transmitting element and a drive element, wherein
• to transfer from an open switching state to a closed switching state of the electromechanical switch, the drive element is configured to move the force-transmitting element along a movement path, and the force-transmitting element moved along the movement path is configured to act mechanically on the second switching contact and to move the second switching contact toward the first switching contact, and
• to maintain the closed switching state of the electromechanical switch, the force-transmitting element is configured to apply, at an end of the movement path, a pressing force to the second switching contact for pressing against the first switching contact, without further driving via the drive element,
• wherein the switching device further comprises a spring element comprising an elastic busbar which is electrically and mechanically connected to the second switching contact,
• wherein the second switching contact is connected to the spring element which is configured to move the second switching contact away from the first switching contact during a movement of the force-transmitting element counter to the movement path and to hold the second switching contact in a moved-away state to maintain the open switching state.

A switching device for an on-board electrical system of an electrically drivable motor vehicle, comprising:

• an electromechanical switch which is configured to connect and interrupt a supply line of the on-board electrical system, wherein the electromechanical switch comprises:
• a stationary first switching contact,
• a movable second switching contact, and
• an actuation unit which has a mechanical force-transmitting element and a drive element, wherein
• to transfer from an open switching state to a closed switching state of the electromechanical switch, the drive element is configured to move the force-transmitting element along a movement path, and the force-transmitting element moved along the movement path is configured to act mechanically on the second switching contact and to move the second switching contact toward the first switching contact, and
• to maintain the closed switching state of the electromechanical switch, the force-transmitting element is configured to apply, at an end of the movement path, a pressing force to the second switching contact for pressing against the first switching contact, without further driving via the drive element,
• wherein the force-transmitting element has a push rod which is displaceable by the drive element, and
• wherein the push rod is oriented obliquely to a surface of the second switching contact, so that the push rod moved along the movement path is configured to slide over the surface of the second switching contact and to push the second switching contact obliquely to an orientation direction of the movement path in a direction of the first switching contact.