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2 Engineering
2.3 Tripping characteristics
2.3.6 Test of auxiliary contacts 95/96, 97/98
2.3.7 Short circuit protection according IEC 60947-4-1 for coordination type 1 and
coordination type 2
34
DANGER
Caution must be taken when using the ZEB overload relay to
protect motors in potentially explosive environments as there is
potential for motor overheating by repeated resetting of the
device!
After commissioning, install the ZEB-XSC Tamper Proof Cover
to prevent changing from the Manual Reset function to
Automatic Reset function, and to prevent other adjustments
which could impact motor protection or affect operator safety.
An additional Test button enables the operation of the auxiliary contact to be
checked. The Test button has a dual function here:
•
Pressing the Test button opens the NC contact 95-96.
The contact recloses after the button is released.
This function can be used for switching off the motor manually.
•
Pulling the Test button causes the overload relay to trip. NC contact
95-96 opens and NO contact 97-98 closes. After the Test button is
released, the overload relay must be reset in the same way as after a
trip.
The ZEB can be protected with the following fuses angainst short circuit:
Table 8: ZEB12 directly fitted or separately mounted.
Overload relay
Fuse gG/gL
Classification
type "1"
A
ZEB12-1.65
4
ZEB12-1.65-GF
4
ZEB12-5
16
ZEB12-5-GF
16
ZEB12-20
50
ZEB12-20-GF
50
ZEB (XTOE, C440) 11/16 MN03402007Z-DE/EN www.eaton.com
Rated short-circuit
current
Classification
I
q
type "2"
A
kA
2
1
2
1
10
100
10
100
20
100
20
100
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