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Circuit Breaker
and Fuse Sizes
The inverter’s connections to input power must include UL Listed inverse time circuit breakers
with 600V rating, or UL Listed fuses as shown in the table below.
Wire Connectors
WARNING: Field wiring connections must
be made by a UL Listed and CSA Certified
ring lug terminal connector sized for the
wire gauge being used. The connector must
be fixed using the crimping tool specified by
the connector manufacturer.
Motor Overload
Protection
Hitachi SJ300 inverters provide solid state motor overload protection, which depends on the
proper setting of the following parameters:
• B012 “electronic overload protection”
• B212 “electronic overload protection, 2nd motor”
• B312 “electronic overload protection, 3rd motor”
Set the rated current [Amperes] of the motor(s) with the above parameters. The setting range is
0.2 * rated current to 1.2 * rated current.
WARNING: When two or more motors are connected to the inverter, they cannot be protected
by the electronic overload protection. Install an external thermal relay on each motor.
Input
Volta ge
Motor
Output
200V
Inverter Model
Circuit
Breaker
(A)
Fuse
(A)
Input
Volta ge
Motor
Output
400V
Inverter Model
Circuit
Breaker
(A)
Fuse
(A)
HP kW HP kW
200V
1/2 0.4 SJ300-004LFU 10 10
400V
1 0.75 SJ300-007HFU/E 10 10
1 0.75 SJ300-007LFU 10 10 2 1.5 SJ300-015HFU/E 10 10
2 1.5 SJ300-015LFU 10 10 3 2.2 SJ300-022HFU/E 10 10
3 2.2 SJ300-022LFU 15 15 5 4.0 SJ300-040HFU/E 15 15
5 3.7 SJ300-037LFU 20 20 7.5 5.5 SJ300-055HFU/E 15 15
7.5 5.5 SJ300-055LFU 30 30 10 7.5 SJ300-075HFU/E 20 20
10 7.5 SJ300-075LFU 40 40 15 11 SJ300-110HFU/E 30 30
15 11 SJ300-110LFU 60 60 20 15 SJ300-150HFU/E 40 40
20 15 SJ300-150LFU 80 80 25 18.5 SJ300-185HFU/E 50 50
25 18.5 SJ300-185LFU 100 100 30 22 SJ300-220HFU/E 60 60
30 22 SJ300-220LFU 125 125 40 30 SJ300-300HFU/E 70 70
40 30 SJ300-300LFU 150 150 50 37 SJ300-370HFU/E 90 90
50 37 SJ300-370LFU 175 175 60 45 SJ300-450HFU/E 125 125
60 45 SJ300-450LFU 225 225 75 55 SJ300-550HFU/E 125 125
75 55 SJ300-550LFU 250 250 100 75 SJ300-750HFU/E — 175
125 90 SJ300-900HFU/E — 200
150 110 SJ300-110HFU/E — 250
175 132 SJ300-1320HFE — 300
200 150 SJ300-1500HFU — 300
Terminal (ring lug)
Cable support
Cable