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The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
The current rating of a contact is defined as the current level that creates a certain temperature rise of the contact spring — usually 20°C or 30°C. Both electrical and thermal factors govern the heat created by the current.
The time interval between the instant of the occurrence of a specified input condition to a system and the instant of completion of a specified operation.
A current coil is basically a coil, such as, a wire wrapped around an electrical conductor.
In telecommunication, release time is the time interval for a circuit to respond when an enabling signal is discontinued