Motor Protection - Eaton EMS2 Series Manual

4.2 Motor protection

Themotor protection prevents the connected motor from heating up too
much if the actual motor current is greater than the specified rated current
(i. e. I > I ). The time up until tripping depends on the current and the trip
n
class.
Devices with a rated operational current I
t [s]
1000
600
400
300
200
100
60
40
30
20
10
6
4
3
2
1
0.6
0.4
0.3
0.2
0
1 2 3
Figure 15: Tripping characteristics class 10
t = tripping time
I = actual motor current
I = setting of the motor protection on the EMS2 device
n
Devices with a rated operational current I
t [s]
1000
600
400
300
200
100
60
40
30
20
10
6
4
3
2
1
0.6
0.4
0.3
0.2
0
1 2 3
Figure 16: Tripping characteristics class 10A
t = tripping time
I = actual motor current
I = setting of the motor protection on the device EMS2
n
EMS2... Electronic motor starter 10/19 MN034003EN www.eaton.com
of 2.4 A or 3 A are in trip class 10.
e
4 5 6 7
of 9 A have the tripping class 10A.
e
4 5 6 7
4 Short-circuit / motor protection
4.2 Motor protection
Class 10
8 9 10 I / I
n
Class 10 A
8 9 10 I / I
n
27