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6 Specifications of Peripheral Devices
MITSUBISHI CNC
6-2 Selection of circuit protector and contactor
Always select the circuit protector and contactor properly, and install them to each drive unit to prevent disasters.
6-2-1 Selection of circuit protector
Calculate a circuit protector selection current from the rated output and the nominal input voltage of the drive unit
as in the expression below. And then select the minimum capacity circuit protector whose rated current meets the
circuit protector selection current.
Circuit protector selection current [A] =
(Circuit protector selection current for 200V input [A] / Nominal input voltage [V]) × 200 [V]
Selection of circuit protector for 200V input
Option part: A circuit protector is not prepared as an NC unit accessory, so purchase the part from your
dealer, etc.
Unit type
MDS-D-SVJ3-
03NA 04NA 07NA 10NA 20NA 35NA
Rated output 0.3kW 0.4kW 0.75kW 1.0kW 2.0kW 3.5kW
Circuit protector selection
current for 200V input
2.5A 5A 7A 8A 10A 15A
Selection example of circuit protector
(Mitsubishi Electric Corp.)
NF30-
SW3P-5A
NF30-
SW3P-10A
NF30-
SW3P-15A
NF30-
SW3P-15A
NF30-
SW3P-20A
NF30-
SW3P-30A
Rated current of the selection example of
circuit protector
5A 10A 15A 15A 20A 30A
Unit type
MDS-D-SPJ3-
075NA 22NA 37NA 55NA 75NA 110NA
Rated output 0.75kW 2.2kW 3.7kW 5.5kW 7.5kW 11kW
Circuit protector selection current for
200V input
6A 9A 15A 23A 31A 45A
Selection example of circuit protector
(Mitsubishi Electric Corp.)
NF30-
SW3P-15A
NF30-
SW3P-20A
NF30-
SW3P-30A
NF50-
SW3P-50A
NF100-
SW3P-60A
NF100-
SW3P-
100A
Rated current of the selection example of
circuit protector
15A 20A 30A 50A 60A 100A
1. It is dangerous to share a circuit protector for multiple drive units, so do not share it. Always install
the circuit protectors for each drive unit.
2. If the control power (L11, L21) must be protected, select according to the section "6-4-1 Circuit
protector ".
CAUTION