Short-Circuit Protection Of The Overload Relays - Eaton XTOBP24BC1 Handbuch

2 Engineering

2.3 Short-circuit protection of the overload relays

2.3 Short-circuit protection of the overload relays
36
Example
I /I = 6, t = 10 s
A N E
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 2
Figure 6: Tripping characteristic of the overload relay
The motor is reliably protected.
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.
CAUTION

According to EN 60947-4-1 only type of coordination "2" may
be used for the protection of EEx e motors.
ZB12-..., ZB32-... 11/16 MN03407004Z-DE/EN www.eaton.com
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