Protection Settings
Long Time Delay (LTD) protection
26
TemBreak PRO P_BE-UM-001-EN V1.3.0
Adjusting I
r
(Current)
The LTD protection trip range is: 1.05...1.20 x I
r
according to standard AS/NZS IEC 60947.2.
The trip threshold tolerance I
r
for the long-time delay protection is +5% to +20%.
The I
r
trip threshold is adjusted using two I
r
dials on the front of the MCCB:
I
r1
– maximum scale adjustment
I
r2
– fine adjustment of the maximum scale in increments of 1%
The I
r
threshold is firstly set using the I
r1
dial to set the maximum current range, then, if necessary, from the I
r2
dial further adjustments in fine increments of
1% can be made from OFF to 0.92 x I
r1
dial. Refer to the Commissioning – LTD Adjustments (I
r
,
t
r
) section for further information on using the I
r1
and I
r2
adjustment dials.
WARNING: Setting I
r2
to OFF will disable both LTD and STD protection modes; therefore, the MCCB will provide
instantaneous protection only.
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