Parameter Range Inverse time over-current
Latch Not enabled, Enabled Enabled
Alarm action Trip [Breaker]
Standard inverse time over-current curves
The controller includes these standard inverse time over-current curves, in accordance with IEC 60255.
Table 3.40
Parameters for the inverse time over-current curves
Curve name k c alpha (α, or a)
IEC inverse 0.14 s 0 s 0.02
IEC very inverse 13.5 s 0 s 1
IEC extremely inverse 80 s 0 s 2
IEEE moderately inverse 0.0515 s 0.114 s 0.02
IEEE very inverse 19.61 s 0.491 s 2
IEEE extremely inverse 28.2 s 0.1217 s 2
Custom characteristic Customisable Customisable Customisable
DESIGNER'S HANDBOOK 4189340911K UK Page 70 of 521
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