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AC Main Circuit Considerations
Protection Devices
Power Disconnect
Wire Size and Protection Devices
Table 3-2 230VAC Controls (3 Phase) Wire Size and Protection Devices
Control Output Rating
Amps
3
4
7
10
16
22
28
42
54
68
80
104
130
145
192
Note: All wire sizes are based on 75°C copper wire. Higher temperature smaller gauge wire may be used per NEC
and local codes. Recommended fuses/breakers are based on 40°C ambient, maximum continuous control
output current and no harmonic current.
3-6 Receiving & Installation
Be sure a suitable input power protection device is installed. Use the recommended
circuit breaker or fuses listed in Tables 3-2 through 3-3 (Wire Size and Protection
Devices). Input and output wire size is based on the use of copper conductor wire rated
at 75 °C. The table is specified for NEMA B motors.
Circuit Breaker:
1 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230 VAC
3 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230 VAC or
GE type TED for 460 VAC.
Fast Action Fuses:
230 VAC, Buss KTN
460 VAC, Buss KTS to 600A (KTU 601 - 1200A)
Very Fast Action:
230 VAC, Buss JJN
460 VAC, Buss JJS
Time Delay Fuses:
230 VAC, Buss FRN
460 VAC, Buss FRS to 600A (KLU 601 - 1200A)
A power disconnect should be installed between the input power service and the control
for a fail safe method to disconnect power. The control will remain in a powered-up
condition until all input power is removed from the control and the internal bus voltage is
depleted.
Input Breaker
Input Breaker
HP
(Amps)
0.75
1
2
3
5
7.5
10
40
15
60
20
70
25
90
30
100
40
150
50
175
60
200
75
250
Input Fuse (Amps)
Fast Acting
Time Delay
5
4
6
5
10
9
15
12
25
20
30
30
45
35
70
60
80
70
100
90
125
110
175
150
200
175
225
200
300
250
Wire Gauge
2
AWG
mm
14
2.5
14
2.5
14
2.5
14
2.5
12
3.31
10
5.26
8
8.37
6
13.3
6
13.3
4
21.2
3
26.7
1
42.4
1/0
53.5
2/0
67.4
4/0
107.0
MN723
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Troubleshooting
