- The time required for the contacts of a relay or switch to open, once the actuating signal or condition is removed.
- The time required for a circuit to open once the actuating signal, such as a current or voltage, is removed.
- The time required for something, such as a communications circuit, to become available once that which prevent its use is removed.
- The time it takes a complementary action to begin, once the other action is terminated. For example, in a transceiver, the time it takes a receiver to be actuated once the transmitter stops operating.