R x I2
R
OH
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2
TRANSCAT TECHNICAL REFERENCE
E
I
Full-Load Current
HP
1
/4
1
/3
1
/2
3
/4
1
11/2
2
3
5
71/2
10
15
20
25
30
40
50
60
75
100
125
150
200
Full-Load Current in Amperes
Full-Load Current in Amperes
Direct-Current Motors
Single-Phase Alternating Current Motors
90V
4.0
5.2
6.8
9.6
12.2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
120V
3.1
4.1
5.4
7.6
9.5
13.2
17
25
40
58
76
—
—
—
—
—
—
—
—
—
—
—
—
180V
2.0
2.6
3.4
4.8
6.1
8.3
10.8
16
27
—
—
—
—
—
—
—
—
—
—
—
—
—
—
240V
1.6
2.0
2.7
3.8
4.7
6.6
8.5
12.2
20
29
38
55
72
89
106
140
173
206
255
341
425
506
675
500V
—
—
—
—
—
—
—
—
—
13.6
18
27
34
43
51
67
83
99
123
164
205
246
330
550V
—
—
—
—
—
—
—
—
—
12.2
16
24
31
38
46
61
75
90
111
148
185
222
294
Full-Load Current
Two-Phase Alternating-Current Motors (4 wire)
HP
1
/2
3
/4
1
11/2
2
3
5
71/2
10
15
20
25
30
40
50
60
75
100
125
150
200
115V
4
4.8
6.4
9
11.8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
230V
2
2.4
3.2
4.5
5.9
8.3
13.2
19
24
36
47
59
69
90
113
133
166
218
270
312
416
460V
1
1.2
1.6
2.3
3
4.2
6.6
9
12
18
23
29
35
45
56
67
83
109
135
156
208
575V
0.8
1.0
1.8
1.8
2.4
3.3
5.3
8
10
14
19
24
28
36
45
53
66
87
108
125
167
2300V
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
14
18
23
28
32
43
For 90 and 80% power factor, the above figures should be multiplied by 1.1 and 1.25
respectively.
HP
1
/6
1
/4
1
/3
1
/2
3
/4
1
11/2
2
3
5
71/2
10
115V
4.4
5.8
7.2
9.8
13.8
16
20
24
34
56
80
100
200V
2.5
3.3
4.1
5.6
7.9
9.2
11.5
13.8
19.6
32.2
46
57.5
208V
2.4
3.2
4
5.4
7.6
8.8
11
13.2
18.7
30.8
44
55
230V
2.2
2.9
3.6
4.9
6.9
8
10
12
17
28
40
50
The voltages listed are rated motor voltages. The listed currents are for system
voltage ranges of 110 to 120 and 220 to 240.
Running Overload Units
Kind of
Motor
Number and Location of
Over-Load Units, Such
as Trip Coils or Relays
Supply System
1-Phase
AC or DC
1-Phase
AC or DC
1-Phase
AC or DC
1-Phase AC
2-Phase AC
2-wire, 1-phase AC or DC,
ungrounded
2-wire, 1-phase AC or DC,
one conductor ungrounded
3-wire, 1-phase AC or DC,
grounded neutral
Any 3-phase
3-wire, 2-phase AC, ungrounded
3-wire,
2-phase AC,
2-Phase AC
one conductor grounded
2-Phase AC 4-wire, 2-phase AC,
grounded or ungrounded
2-Phase AC 5-wire, 2-phase AC, grounded
neutral or ungrounded
1 in either conductor
3-Phase AC Any 3-phase
3, one in each phase*
1 in ungrounded conductor
1 in either ungrounded
conductor
1 in ungrounded conductor
2, one in each phase
2 in ungrounded conductors
2, one per phase in
ungrounded conductors
2, one per phase in any
ungrounded phase wire
* Exception: Where protected by other approved means.
Motor Branch—Circuit Protective Devices
Maximum Rating or Setting
Type of Motor
InverseBreaker*
PERCENT OF FULL-LOAD CURRENT
Dual
Non-Time
Element
Instantaneous
Delay
(Time-Delay)
Trip
Fuse**
Fuse**
Breaker
Time
Single-phase motors
300
AC polyphase motors other than
wound-rotor Squirrel Cage:
Other than design E
300
Design E
300
Synchronous
300
Wound rotor
150
Direct-current (constant voltage)150
175
800
250
175
175
175
150
150
800
1100
800
800
250
250
250
250
150
150
* The values given in the last column also cover the ratings of non-adjustable
inverse time types of circuit breakers that may be modified
** The values in the Non-time Delay Fuse column apply to time delay class CC fuses
CALL:
800-828-1470
FAX: 800-395-0543
WEB: www.transcat.com
R
Full-Load Current
Full-Load Current
Three-Phase Alternating Current Motors
Induction Type
Squirrel-Cage and Wound-Rotor
Amperes
Full-Load Current and Other Data
Three Phase AC Motors
Synchronous Type
Unity Power Factor*
Amperes
HP
115 200 208 230 460 575 2300 230 460 575 2300
Volts Volts Volts Volts Volts Volts Volts Volts Volts Volts Volts
/2
/4
1
11/2
2
3
5
73/4
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
350
400
450
500
4.4
6.4
8.4
12.0
13.6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1
3
2.5
3.7
4.8
6.9
7.8
11.0
17.5
25.3
32.2
48.3
62.1
78.2
92
120
150
177
221
285
359
414
552
—
—
—
—
—
—
2.4
3.5
4.6
6.6
7.5
10.6
16.7
24.2
30.8
46.2
59.4
74.8
88
114
143
169
211
273
343
396
528
—
—
—
—
—
—
2.2
3.2
4.2
6.0
6.8
9.6
15.2
22
28
42
54
68
80
104
130
154
192
248
312
360
480
—
—
—
—
—
—
1.1
1.6
2.1
3.0
3.4
4.8
7.6
11
14
21
27
34
40
52
65
77
96
124
156
180
240
302
361
414
477
515
590
0.9
1.3
1.7
2.4
2.7
3.9
6.1
9
11
17
22
27
322
41
52
62
77
99
125
144
192
242
289
336
382
412
472
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
16
20
26
31
37
49
60
72
83
95
103
118
—
—
—
—
—
—
—
—
—
—
—
53
63
83
104
123
155
202
253
302
400
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
26
32
41
52
61
78
101
126
151
201
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
21
26
33
42
49
62
81
101
121
161
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
12
15
20
25
30
40
—
—
—
—
—
—
The voltages listed are rated motor voltages. The currents listed shall be permitted for
system voltage ranges of 110 to 120, 220 to 240, 440 to 480, and 550-600 volts.
* For 90 and 80 percent power factor, the above figures shall be multiplied by 1.1 and
1.25, respectively.
Three Phase AC Motor Windings and Connections
1.
1.
4.
7.
9.
6.
4.
7.
8.
9.
6.
5.
8.
3.
2.
"Y" OR STAR
3.
5.
2.
DELTA
HIGH VOLTAGE
9
6
HIGH VOLTAGE
6
5
4
4
9
8
7
8
5
7
3
2
1
2
3
1
T-3
T-2
T-1
T-2
T-3
T-1
LOW VOLTAGE
LOW VOLTAGE
6
5
4
4
9
6
9
8
7
8
5
7
3
2
1
2
3
1
T-3
T-2
T-1
T-2
T-3
T-1
NOTE
Motor
Horsepower
1
/2
230V
460
3
/4
230
460
1
230
460
11/2
230
460
2
230
460
3
230
460
5
230
460
71/2
230
460
10
230
460
15
230
460
20
230
460
25
230
460
30
230
460
40
230
460
50
230
460
60
230
460
75
230
460
100
230
460
125
230
460
150
230
460
Motor
Ampere
2.2
1.1
3.2
1.6
4.2
2.1
6.0
3.0
6.8
3.4
9.6
4.8
15.2
7.6
22
11
28
14
42
21
54
27
68
34
80
40
104
52
130
65
154
77
192
96
248
124
312
156
360
180
Size
Breaker
15
15
15
15
15
15
15
15
15
15
15
15
15
15
40
30
50
30
70
40
100
50
100
50
125
70
175
100
200
150
250
200
300
200
400
200
500
250
600
300
Size
Starter
00
00
00
00
00
00
00
00
0
00
0
0
1
0
1
1
2
1
2
2
3
2
3
2
3
3
4
3
4
3
5
4
5
4
5
4
6
5
6
5
Heater
Ampere
2.530
1.265
3.680
1.840
4.830
2.415
6.900
3.450
7.820
3.910
11.040
5.520
17.480
8.740
25.300
12.650
32.200
16.100
48.300
24.150
62.100
31.050
78.200
39.100
92.000
46.000
119.600
59.800
149.500
74.750
177.10
88.55
220.80
110.40
285.20
142.60
358.80
179.40
414.00
207.00
Size
Wire
12
12
12
12
12
12
12
12
12
12
12
12
12
12
10
12
10
12
6
10
6
10
4
8
3
8
1
6
00
4
000
3
250
2
350
0
600
000
700
0000
Size
Conduit
3
/4”
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
3
/4
1
3
/4
1
3
/4
11/2
1
11/2
1
11/2
1
2
11/2
2
11/2
21/2
11/2
3
2
31/2
2
4
21/2
Note:
1. Wire and conduit size will vary depending on type of insulation and
termination listing.
2. The preceding calculations apply to induction type, squirrel-cage,
and wound-rotor motors only.
3. The voltages listed are rated motor voltages; corresponding nominal system
voltages are 220V to 240V, and 440V to 480V
4. Hertz: Preferred terminology for cycles per second.
5. Form coil: Coil made with rectangular or square wire.
6. Mush coil: Coil made with round wire.
7. Slip: Percentage difference between synchronous and operating speeds.
8. Synchronous speed: Maximum speed for A.C. motors or
(Frequency x 120)/ Poles.
9. Full load: Speed at which rated horsepower is developed.
10. Poles: Number of magnetic poles set up inside the motor by the placement
and connection of the windings.
• THE MOST IMPORTANT PART OF ANY MOTOR IS THE
NAME-PLATE. CHECK THE DCATA GIVEN ON THE PLATE
BEFORE MAKING THE CONNECTIONS.
• TO CHANGE ROTATION DIRECTIONS OF 3 PHASE MOTOR,
SWAP ANY 2 T-LEADS
CALL:
800-828-1470
FAX: 800-395-0543
WEB: www.transcat.com
OH
P
PxR
M
S
P
S
LT
VO E
PS
AM
P
E
I
I
ExI
TRANSCAT TECHNICAL REFERENCE
R
W
AT
TS
R x I2
E
2
E
I