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Engineering
48
Example: I
10
8
6
4
2
1
40
20
10
8
6
4
2
1
0.8
0.6
0.4
0.2
0.1
1
Figure 6:
The motor is reliably protected.
Short-circuit protection of the overload relays
The overload relays are short-circuit protected by means of
fuses. When the relay is mounted directly onto a contactor
relay, the corresponding primary fuse of the contactor relay
is taken into account accordingly.
i
Warning!
Only type 2 coordination according to EN 60947-4-1 may
be used for the protection of Ex e motors.
/I
= 6, t
= 10 s
A
N
E
2
3
Tripping characteristic of the overload relay
03/15 MN03407004Z-DE/EN
4
5
6
7 8 9 10
1
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