Filter
Top Products
MDS-D/DH Series Specifications Manual
6-2 Selection of circuit protector and contactor
6 - 9
6-2-2 Selection of contactor
Select the contactor selection current that is calculated from the rated output and the nominal input voltage
(voltage supplied to the power supply unit) as in the expression below. And then select the contactor whose
conventional free-air thermal current meets the contactor selection current.
< MDS-D Series >
Contactor selection current [A]=
(Contactor selection current for 200V input [A] / Nominal input voltage [V]) × 200 [V]
Selection of contactor for 200V input
Option part: A contactor is not prepared as an NC unit accessory, so purchase the part from your dealer, etc.
< MDS-DH Series >
Contactor selection current [A] =
(Contactor selection current for 380V input [A] / Nominal input voltage [V]) × 380 [V]
Selection of contactor for 380V input
Option part: A contactor is not prepared as an NC unit accessory, so purchase the part from your dealer, etc.
Unit type
MDS-D-CV-
37 75 110 185 300 370 450 550
Rated output 3.7kW 7.5kW 11kW 18.5kW 30kW 37kW 45kW 55kW
Contactor selection
current for 200V input
15A 31A 45A 76A 124A 153A 186A 224A
Selection example of contactor
(Mitsubishi Electric Corp.)
S-N12
-AC200V
S-N25
-AC200V
S-N25
-AC200V
S-N65
-AC200V
S-N80
-AC200V
S-N150
-AC200V
S-N150
-AC200V
S-N180
-AC200V
Conventional freeair thermal
current of the selection example
of contactor
20A 50A 50A 100A 135A 200A 200A 260A
(Example)
Select a contactor for using the MDS-D-CV-110 with a 220V nominal input voltage.
Contactor selection current = 45/220 × 200 = 40.9[A]
According to the table above, select "S-N25-AC200V".
Unit type
MDS-DH-CV-
37 75 110 185 300 370 450 550 750
Rated output 3.7kW 7.5kW 11kW 18.5kW 30kW 37kW 45kW 55kW 75kW
Contactor selection
current for 380V input
8A 16A 24A 40A 65A 80A 98A 119A 163A
Selection example of contactor
(Mitsubishi Electric Corp.)
S-N12-
AC400V
S-N12-
AC400V
S-N21-
AC400V
S-N25-
AC400V
S-N50-
AC400V
S-N65-
AC400V
S-N65-
AC400V
S-N80-
AC400V
S-N150-
AC400V
Conventional freeair thermal
current of the selection example
of contactor
20A 20A 32A 50A 80A 100A 100A 135A 200A
(Example)
Select a contactor for using the MDS-DH-CV-450 with a 480V nominal input voltage.
Contactor selection current = 98/480×380 = 77.6[A]
According to the table above, select "S-N50-AC400V".
1. Use an alternating contactor.
2. If the contactor selection current is 20A or less, select the S-N12 product for the contactor.
3. Select a contactor whose excitation coil does not operate at 15mA or less.
POINT