ABB 615 Series - Current Based Inverse Definite Minimum Time Characteristics

A070422-ANSI V1 EN
Figure 547: Operating effect of the BLOCK input when the selected blocking mode is
"Freeze timer"
If the BLOCK input is activated when the operation timer is running, as described in Figure
547, the timer is frozen during the time BLOCK remains active. If the timer input is not
active longer than specified by the Reset delay time setting, the operation timer is reset in
the same way as described in Figure 545, regardless of the BLOCK input.
The selected blocking mode is "Freeze timer".
11.2 Current based inverse definite minimum time
characteristics
11.2.1 IDMT curves for overcurrent protection
In inverse-time modes, the trip time depends on the momentary value of the current: the
higher the current, the faster the trip time. The trip time calculation or integration starts
1MAC059074-MB A Section 11
General function block features
615 series ANSI 1077
Technical Manual