2 Engineering
2.3 tripping characteristics
Electronic motor starter EMS-...-SWD
12/18 MN034002ZU-DE/EN
www.eaton.com
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2.3 tripping characteristics
EMS-DOS/ROS-SWD electronic motor starters feature two different trip
characteristics (class 10 and class 10A) for protecting motors against thermal
overloads. The characteristic curve used will depend on the device model‘s
current range (2.4 A or 9 A) and, in the case of devices with 9 A, on the value
set for the motor current.
Table 8 shows when each trip characteristic applies:
Table 8: Applicable trip characteristic classes
When the class 10A trip characteristic is used, the electronic motor starter
will trip within 500 seconds if the load current exceeds 60 A.
Figure 2: Tripping characteristics Class 10
Figure 3: Tripping characteristics Class 10A
Device Type
Motor current [A] set value
Release class
EMS-…-2.4-SWD
0.18 - 2.4
Class 10
EMS-…-9-SWD
1.5 - 4.0
Class 10
EMS-…-9-SWD
4.5 - 9.0
Class 10A
t [s]
1
2
3
4
5
6
7
8
9
10 I / I
n
1
10
100
1000
60 40
30 20
600 400
300 200
6 4
3
2
0.6 0.4
0.3 0.2
0
Class 10
1
2
3
4
5
6
7
8
9
10 I / I
n
1
10
100
1000
60 40
30 20
600 400
300 200
6 4
3
2
0.6 0.4
0.3 0.2
0
Class 10 A
t [s]
