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Electronic motor protective relay
Selection aid
2010
CA08103002Z-EN
www.eaton.com6/23
Selectionaid
Tripping characteristics
With a phase failure or imbalance
> 50 %, the ZEV will trip within
2.5
seconds.
Tripping times for ZEV electronic motor-protective relay
Tripping class,
adjustable
CLASS
5
10
15
20
25
30
35
40
Tripping times in s (±20 %)
With 3-pole symmetric loading from cold state
Current setting I
E
x 3
11.3
22.6
34
45.3
56.6
67.9
79.2
90.5
x 4
8
15.9
23.9
31.8
39.8
47.7
55.7
63.6
x 5
6.1
12.3
18.4
24.6
30.7
36.8
43
49.1
x 6
5
10
15
20
25
30
35
40
x 7.2
4.1
8.2
12.3
16.4
20.5
24.5
28.6
32.7
x 8
3.6
7.3
10.9
14.6
18.2
21.9
25.5
29.2
x 10
2.9
5.7
8.6
11.5
14.4
17.2
20.1
23
Reset time after overload trip
Overview of the
reset time
CLASS
5
10
15
20
25
30
35
40
t
reset
min 5
6
7
8
9
10
11
12
Thermistor tripping
Rated trip resistance
R = 3200 Ω ±15 %
Reset resistance
R = 1500 Ω +10 %
Total PTC thermistor resistance ∑ R
K
≦ 1500 Ω
at R
K
≦ 250 Ω per sensor: 6 sensors
at R
K
≦ 100 Ω per sensor: 9 sensors
Ready to respond after trip at 5 K under response temperature
Test button tripping time: 5 s
20
CLASS 40
25
15
CLASS 5
10
t
A
100
50
20
10
5
2
1
20
10
5
2
1
0.7 1 2
5 8
30
35
x
I
e
ZEV
Minutes
Seconds
ZEV