When the BLOCK input is active, the internal value of the time counter is frozen at the value of the moment just before the freezing. Freezing of the counter value is chosen when the user does not wish the counter value to count upwards or to be reset. This may be the case, for example, when the inverse-time function of a protection relay needs to be blocked to enable the definite-time operation of another protection relay for selectivity reasons, especially if different relaying techniques (old and modern relays) are applied.
The selected blocking mode is "Freeze timer".
The activation of the BLOCK input also lengthens the minimum delay value of the timer.
Activating the BLOCK input alone does not affect the operation of the START output. It still becomes active when the current exceeds the set Start value, and inactive when the current falls below the set Start value and the set Reset delay time has expired.