Energy efficient multi-stable lock cylinder

A circuit comprising:

• a plug assembly housing a lock control circuit and a locking pin;
• a power source powering the lock control circuit, the power source electronically coupled to the lock control circuit;
• a multi-stable mechanism being in a first stable configuration corresponding to a locked state, the multi-stable mechanism having a second stable configuration corresponding to an unlocked state, the multi-stable mechanism being actuatable by the lock control circuit to switch between the first stable configuration and the second stable configuration, wherein:
• the lock control circuit responsive to successfully authenticating an external object, places the multi-stable mechanism in the second stable configuration;
• the locking pin is configured to prevent a rotation of the plug assembly when the locking pin is engaged in a notch of a housing shell in the locked state, and the multi-stable mechanism configured to prevent the locking pin from retracting from the notch in the locked state;
• and
• the lock control circuit unpowers the multi-stable mechanism in association with placing the multi-stable mechanism in the second stable configuration.