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2.3.1 Switchgear and cable sizing corresponding to the respective starting inertia (CLASS)
10000
t [s]
1000
100
10
1
1
2
3
Figure 2: Tripping characteristics
(I
= current setting)
r
Table 6: Tripping times
CLASS Ir
t
[s]
A
x 3
x 4
10A
22.3
12.1
10
44.5
24.2
20
89.0
48.3
30
133.5
72.5
Switchgear is designed according to CLASS 10 requirements for both normal
and overload conditions. In order for the switchgear (circuit-breaker and
contactor) and the cables not to be overloaded with long tripping times, they
must be overdimensioned accordingly. The rated operational current, I
switchgear and cables can be calculated with the following current factor
taking the tripping class into account.
Table 7: Current factor for tripping classes
Tripping class
CLASS 5
Current factor of rated
1,00
operational current I
e
ZEB (XTOE, C440) 11/16 MN03402007Z-DE/EN www.eaton.com
Class 30
Class 20
Class 10
Class 10A
4
5
6
7 x I
r
x 5
x 6
x 7.2
7.6
6.0
6.0
15.2
10.5
7.2
30.4
21.0
14.5
45.7
31.4
21.7
CLASS 10
CLASS 15
1,00
1,22
2 Engineering
2.3 Tripping characteristics
x 8
x 10
6.0
6.0
6.0
6.0
11.7
7.5
17.5
11.2
CLASS 20
CLASS 25
1,41
1,58
, for
e
CLASS 30
1,73
31
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