Configuration
4.1 Rated operational current and derating
SIRIUS 3RM1 motor starter
52
Manual, 11/2013, A5E0345285095020A/RS-AB/002
Motors with a high efficiency and high motor starting currents
High starting currents may have to be taken into consideration when using 3RM1 motor
starters on motors with a high efficiency (IE3 or IE4). According to the product standard
IEC 60947-4-2, the 3RM1 motor starters are designed for motors with a maximum 8-fold
starting current.
If motors are operated that have a higher starting current, refer to the following table for the
maximum adjustable motor current:
Motor starter version
I
eAC53a
[A] at 40°C max.
motor starting current
3RM1.01-.....
3RM1.02-.....
3RM1.07-.....
<= 8-fold I
e
0,5
2
7
8.5-fold I
e
0,47
1,9
6,6
9-fold I
e
0,45
1,8
6,2
9.5-fold I
e
0,42
1,7
5,9
10-fold I
e
0,4
1,6
5,6
The device protection may respond sooner in the case of motors with a higher starting
current. You will find details in "Figure 9-2 Device protection characteristic (Page 126)".
Dependence of the rated operational current on the assembly type, the design version and the
ambient temperature
The permissible rated operational current of the 3RM1 motor starter reduces depending on
the assembly type, the design version, and the ambient temperature T
A
as follows:
Motor starter version 3RM1.01-..... to 0.5 A and 3RM1.02-..... to 2 A:
For the versions 0.5 A and 2 A, the following ambient temperature limits apply depending on
the assembly type:
Assembly type
Max. ambient temperature for 0.5 A and 2 A device for AC 53 a
Side-by-side
Individually/with 22.5 mm
clearance
Vertically on horizontal rail
50 °C
60 °C
Horizontally on vertical rail
45 °C
60 °C
Upright on horizontal
rail/mounting surface
45 °C
60 °C
