E6582233
I-2
9
Selection of wiring devices
Voltage
class
Applicable
motor
(kW)
Input current (A)
Molded case circuit breaker (MCCB)
Earth leakage circuit breaker (ELCB)
Magnetic contactor
(MC) (Note 1 to 3)
Without
ACL
With ACL
Rated current (A)
Rated current (A)
Without ACL
With ACL
Without ACL
With ACL
3 phase
400V
class
Note 5)
0.4 2.1 1.5
5
5
20
20
0.75 3.6 2.6
5
5
20
20
1.5
6.5
4.7
10 10 20 20
2.2
8.7
6.4
15 10 20 20
3.7
13.7
10.3
20 15 20 20
5.5
20.7
14.0
30 20 32 20
7.5
26.5
18.1
30 30 32 32
11
36.6
24.1
50 40 50 32
The recommended molded case circuit breaker (MCCB) must be connected to primary side of each inverter to
protect the wiring system.
Note 1: Be sure to attach a surge killer to the exciting coil of the relay and the magnetic contactor.
Note 2: When using the auxiliary contacts 2a of the magnetic contactor MC for the control circuit, connect the
contacts 2a in parallel to increase reliability.
Note 3: When a motor is driven by commercial power supply using commercial power supply / inverter switching
circuit, use a magnetic contactor appropriated AC-3 class the motor rated current.
Note 4: Select an MCCB with a current breaking rating appropriate to the capacity of the power supply, because
short-circuit currents vary greatly depending on the capacity of the power supply and the condition of the
wiring system. The MCCB, MC and ELCB in this table were selected, on the assumption that a power
supply with a normal capacity would be used.
Note 5: For the operation and control circuits, regulate the voltage at 200V to 240V with a step-down transformer
for 400V class.
Note 6: Regarding influence of leakage current, refer to section 1.4.3.
