Specifications

23
Mini-Contactors
SK Series
Handling
Example: Calculation Method for Dial Adjustment
at an Ambient Temperature of 55°C
Dial current at 20°C
Compensation coefficient
at ambient temperature of 55°C
Dial current
at ambient temperature of 55°C
=
Ambient Temperature Compensation Characteristics
Changes in the ambient environment will affect the operation of
the Thermal Overload Relay. The operational current will be higher
at lower temperatures and lower at higher temperatures, i.e.,
compensation of operating characteristics will not be complete.
Adjust the current according to the application environment.
The compensation coefficient for adjusting the current depends
on the ambient temperature, as shown in Figure 3. If the ambient
temperature in the application changes greatly, e.g., by 20°C, use
the following example as a guide to calculate the adjusted current
value after compensation.
Mounting the Thermal Overload Relay to and Removing It from the
Magnetic Contactor
I. Mounting [Figure 4]
1) Loosen terminals 2, 4, and 6 on the Magnetic Contactor.
2) Insert the posts on the Thermal Overload Relay into the holes
on the Magnetic Contactor in the direction shown by the arrows.
3) Insert the main circuit section of the Thermal Overload Relay on
the right sides of the terminal screws.
4) Tighten the terminal screws on the Magnetic Contactor to the
specified torque.
II. Removing [Figure 4]
1) Loosen the terminals screws on the Magnetic Contactor.
2) Move the Thermal Overload Relay left and right and pull it free
from the Magnetic Contactor.
Figure 4
Figure 5
②
③
Figure 3
Ambient temperature [°C]
Adjusted current
at the maximum scale value
Adjusted current
at the minimum scale value
Compensation
coefficient
1.2
0.8
1.1
1.0
0.9
-10 0 10 20 30 40 50 60