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Note: The values in the following table are taken from Figure 4.4.
The table is edited with SETPOINTPS under menu "BREAKER
CURVE".
Table 4.13 – Example of Circuit Breaker Wearing Characteristics
Point
Interrupted current (kA)
1
0 (mechanical age)
2
1.25 (rated current)
3
31.0 (maximum breaking current)
4
100
5
100
6
100
7
100
8
100
Setting Alarm Points
There are two alarm points available having two setting
parameters each.
•
Current
The first alarm can be set for example to nominal current of the
CB or any application typical current. The second alarm can be
set for example according a typical fault current.
•
Operations left alarm limit
An alarm is activated when there are less operation left at the
given current level than this limit.
Any actual interrupted current will be logarithmically weighted
for the two given alarm current levels and the number of
operations left at the alarm points is decreased accordingly.
When the "operations left" i.e. the number of remaining
operations, goes under the given alarm limit, an alarm signal is
issued to the output matrix. Also an event is generated
depending on the event enabling.
4-13
Supporting Functions
Number of permitted operations
10000
10000
80
1
1
1
1
1
857-UM001A-EN-P – July 2009
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