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Moulded Case Circuit Breaker (MCCB), Earth Leakage Circuit Breaker (ELB),
Applicable
Inverter Model
FR-F720PJ-0.4K
FR-F720PJ-0.75K
FR-F720PJ-1.5K
FR-F720PJ-2.2K
FR-F720PJ-3.7K
FR-F720PJ-5.5K
FR-F720PJ-7.5K
FR-F720PJ-11K
FR-F720PJ-15K
FR-F740PJ-0.4K
FR-F740PJ-0.75K
FR-F740PJ-1.5K
FR-F740PJ-2.2K
FR-F740PJ-3.7K
FR-F740PJ-5.5K
FR-F740PJ-7.5K
FR-F740PJ-11K
FR-F740PJ-15K
·Select an MCCB model according to the power supply capacity.
·Install one MCCB per inverter.
For the use in the United States or Canada, select a UL and cUL certified fuse with Class T fuse equivalent cut-off speed or faster with the appropriate
rating for branch circuit protection. Alternatively, select a UL489 molded case circuit breaker (MCCB).
Magnetic contactor is selected based on the AC-1 class. The electrical durability of magnetic contactor is 500,000 times. When the magnetic contactor is
used for emergency stop during motor driving, the electrical durability is 25 times.
If using an MC for emergency stop during motor driving, select an MC regarding the inverter input side current as JEM1038-AC-3 class rated current.
When using an MC on the inverter output side for commercial-power supply operation switching using a general purpose motor, select an MC regarding
the motor rated current as JEM1038-AC-3 class rated current.
The recommended cable gauge is that of the cable (e.g. HIV cable (600V class 2 vinyl-insulated cable)) with continuous maximum permissible
temperature of 75ºC. Assumes that the surrounding air temperature is 50ºC or less and the wiring distance is 20m or less.
NOTE
When the inverter capacity is larger than the motor capacity during the general-purpose motor operation, select an
MCCB and a magnetic contactor according to the inverter model, and select cable and reactor according to the motor
output.
When the breaker on the inverter primary side trips, check for the wiring fault (short circuit), damage to internal parts
of the inverter, etc. Identify the cause of the trip, then remove the cause and power ON the breaker.
65
Input Side Magnetic Contactor, Cable size
Moulded Case Circuit Breaker (MCCB)
Earth Leakage Circuit Breaker (ELB)
Motor
(NF or NV type)
Output
Power factor improving (AC or DC) reactor
(kW)
Without
0.4
5A
0.75
10A
1.5
15A
2.2
20A
3.7
30A
5.5
50A
7.5
60A
11
75A
15
125A
0.4
5A
0.75
5A
1.5
10A
2.2
15A
3.7
20A
5.5
30A
7.5
30A
11
50A
15
60A
or
Input Side Magnetic
Contactor
Power factor improving
(AC or DC) reactor
With
Without
5A
S-N10
5A
S-N10
10A
S-N10
15A
S-N10
30A
S-N20, S-N21
40A
S-N20, S-N21
S-N20, S-N21
50A
S-N25
S-N20, S-N21
75A
S-N35
100A
S-N50
5A
S-N10
5A
S-N10
10A
S-N10
10A
S-N10
15A
S-N10
20A
S-N20, S-N21
S-N11, S-N12
30A
S-N20, S-N21
S-N20, S-N21
40A
S-N20, S-N21
S-N20, S-N21
50A
S-N25
S-N20, S-N21
Recommended cable
gauge
R/L1, S/L2,
U, V, W
T/L3
With
S-N10
2
S-N10
2
S-N10
2
S-N10
2
S-N10
3.5
3.5
5.5
5.5
14
S-N35
14
14
S-N50
22
22
S-N10
2
S-N10
2
S-N10
2
S-N10
2
S-N10
2
3.5
3.5
3.5
5.5
5.5
8
MCCB
INV
MCCB
INV
2
2
2
2
8
2
2
2
2
2
2
8
M
M
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