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Dynamic Response

Relay cycles (dynamic response)
Due to the self induction of the coil and the inertia of the parts to be moved, on activating a relay the operations do not take place suddenly. The function diagram below shows the different cycles for the most important relay configurations of undelayed power relays.

The cycles specified apply to energizing with nominal voltage (without any components in series or parallel to the coil) and at the reference temperature.

Duty cycle
The ratio between the switch on time and total cycle time during periodical switching. Fifty per cent duty cycle means the switch on time equals the switch off time.

Operate time
The time interval that elapses from when a relay in the rest state has a nominal voltage applied to it to the point of time when the last output circuit is closed or opened (bounce time not included).

Release time (drop time)
The time interval that elapses from the point of time at which a monostable relay in the operating state has the nominal voltage disconnected to the point of time at which the last output circuit has closed or opened (not including the bounce time).

Reset time
The time interval that elapses from the point of time at which a bistable relay in the operating state has the nominal voltage applied in the opposite direction to the point of time at which the last output circuit has closed or opened (not including the bounce time).

Bounce time
The time from the first to the last closing or opening of a relay contact.

Transit time
The time in a changeover contact during which the two contact circuits are opened.

Minimum energization time
The minimum impulse length at the height of the nominal voltage that is required to change the switching position of a bistable relay.