The document provides specifications for various models of variable voltage auto transformers. It includes specifications such as input and output voltages, dimensions, weights, and ratings for over 30 transformer models ranging from 0.75 amps to 600 amps. The transformers can be open/flush air or enclosed/covered air cooled types and are suitable for single or three phase applications. Higher capacity transformers over 200 amps are made by paralleling multiple coils.

1. Variable Voltage
Auto Transformer
NB.Shapesareonlyindicativeandaresubjectto changewithoutnotice
1 Phase Covered/ Enclosed Air Natural cooled Type
1 Phase Open/ Flush Air Air Natural cooled Type
1 Phase Open/ Flush Air Air Natural cooled Type
1 Phase Open/ Flush Air Air Natural cooled Type
Type
Type
Type
Type
Input
Volts
Input
Volts
Input
Volts
Input
Volts
Output
Volts
Output
Volts
Output
Volts
Output
Volts
DIMENSIONS (in mm)
DIMENSIONS (in mm)
DIMENSIONS (in mm)
DIMENSIONS (in mm)
A
A
A
A
B
B
B
B
C
C
C
C
Wt.
Wt.
Wt.
Wt.
GD-0751-P
GD-21-P
GD-41-P
GD-81-P
GD-101-P
GD-151-P
GD-201-P
GD-281-P
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
A
B
C
A
B
C
1 Phase Open/ Flush Air Natural cooled Type
Type
Input
VoltsAmps
Amps
Amps
Amps
Amps
Output
Volts
DIMENSIONS (in mm)
A B C D E F G Wt.
F
G
C
E
D
GD-0751-O
GD-21-O
GD-41-O
GD-81-O
GD-101-O
GD-151-O
GD-201-O
GD-281-O
240
240
240
240
240
240
240
240
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
130
160
175
180
190
240
240
125
190
190
220
235
285
330
115
175
175
190
250
250
395
93
145
145
155
175
205
237
93
145
145
155
175
205
237
100
120
135
135
150
160
160
30
40
45
45
40
70
70
3.5
6.4
8.3
10.0
13.5
18.5
26.0
150
195
215
215
238
265
265
150
215
228
230
255
370
435
130
175
175
200
220
250
300
5.5
9.5
12.5
13.0
17.4
22.0
29.5
0
100
90
80
70
60
50
4030
20
10
Green
Dot
A
A
C
B
B
C
Green
Dot
GDEDM-21-P-DMV-DMI
GDEDM-41-P-DMV-DMI
GDEDM-81-P-DMV-DMI
GDEDM-101-P-DMV-DMI
GDEDM-151-P-DMV-DMI
GDEDM-201-P-DMV-DMI
GDEDM-201-P-DMV-DMI
GDEDM-21-P-DMV-DMI-DMW
GDEDM-41-P-DMV-DMI-DMW
GDEDM-81-P-DMV-DMI-DMW
GDEDM-101-P-DMV-DMI-DMW
GDEDM-151-P-DMV-DMI-DMW
GDEDM-201-P-DMV-DMI-DMW
GDEDM-201-P-DMV-DMI-DMW
180
215
220
240
255
270
260
265
280
310
345
390
180
180
200
230
260
300
10
13.5
15
18
22.5
31
GD-21-P-3M-8
GD-41-P-3M-8
GD-81-P-3M-8
GD-101-P-3M-8
GD-151-P-10M-15
GD-201-P-10M-15
GD-281-P-10M-15
230
330
390
390
390
390
480
180
260
305
305
310
400
400
220
180
235
235
240
310
330
20
16
19
20.5
24
27.5
38.5
278
278
278
338
370
400
390
390
390
430
465
505
220
220
220
260
285
335
11
14.5
16
20
25.5
34.5
DIMENSIONS SHEET PAGE 1

2. 3 Phase covered / Enclosed Air Natural cooled Type
3 Phase covered / Enclosed Air Natural cooled Motorised Type
3 Phase Open/ Flush Air Natural cooled Motorised Type
Rating
Amps
Rating
Amps
Rating
Amps
Rating
Amps
Input
Volts
Amps
Amps
Amps
Amps
Input
Volts
Input
Volts
Input
Volts
Output
Volts
Output
Volts
Output
Volts
Output
Volts
DIMENSIONS (in mm)
DIMENSIONS (in mm)
DIMENSIONS (in mm)
DIMENSIONS (in mm)
A
A
A
A
B
B
B
B
E
E
D
D
C
C
C
C
F
F
Wt.
Wt.
Wt.
Wt.
GD-0753-P
GD-23-P
GD-43-P
GD-83-P
GD-103-P
GD-153-P
GD-203-P
GD-283-P
GD-0753-P-3M-8
GD-23-P-3M-8
GD-43-P-3M-8
GD-83-P-3M-8
GD-103-P-3M-8
GD-153-P-3M-8
GD-203-P-3M-8
GD-283-P-3M-8
GD-0753-O
GD-23-O
GD-43-O
GD-83-O
GD-103-O
GD-153-O
GD-203-O
GD-283-O
GD-0751-O-3M-8
GD-23-O-3M-8
GD-43-O-3M-8
GD-83-O-3M-8
GD-103-O-10M-8
GD-153-O-10M-15
GD-203-O-10M-15
GD-283-O-10M-15
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
650
690
700
710
810
810
410
495
545
545
540
655
655
245
245
245
310
310
370
245
245
245
310
310
370
93
145
145
155
178
205
237
93
145
145
155
178
205
237
24
36
38
49
63
84
19
28
30
41
58
76
C
B
A
A
BD
C
E
A.C. STEP-SYNCHRONOUS MOTOR
1 PHASE 230/240 V 50 Hz Rating
REVERSIBLE TYPE
MICRO SWITCH
CONNECTIONS
E
A
BD
C
MODEL GD-281-O-3M-8
E 1196-392SERIAL . No.
A
A
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
AC
E
C A
D B
CA
DB
MAX. OUTPUT CURRENT 20 AMPS.
TYPE OF COOLING AN/ON
SUITABLE FOR 1 PH. A.C. 50 HZ. SUPPLY
TESTED to IS 5142
VARIABLE VOLTAGE AUTO TRANSFORMER
BD
F
F
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
0.75
2
4
8
10
15
20
28
410
495
545
545
540
655
655
165
190
246
240
235
400
430
146
245
245
225
310
315
355
13.5
27
34
41
50
70
95
600
650
690
700
710
810
810
180
190
245
275
310
400
400
220
245
245
220
240
320
305
20
33.5
41
48
56
77
105.2
B
C
E
D
205
205
205
275
275
305
205
205
205
275
275
305
520
560
570
580
680
680
520
560
570
580
680
680
93
145
145
155
178
205
237
93
145
145
155
178
205
237
Variable Voltage
Auto TransformerDIMENSIONS SHEET PAGE 2
Green
Dot

3. Rating Amps
Rating Amps
Rating Amps
Input
Volts
Input
Volts
Input
Volts
Amps
Amps
Amps
Output
Volts
Output
Volts
Output
Volts
DIMENSIONS (in mm)
DIMENSIONS (in mm)
DIMENSIONS (in mm)
A
A
A
A
A
B
B
B
B
B
C
C
C
C
D
D
D
D
D
E
E
E
E
E
F
F
F
F
F
G
G
G
G
G
H JJ
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
440
440
440
440
440
440
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-270
0-470
0-470
0-470
0-470
0-470
0-470
40
50
60
75
100
150
200
300
400
500
600
40
50
60
75
100
150
40
50
60
75
100
150
B
C
D
I
H
E
F
AJ
G
500-600 Amps.
Units
AJ
G
300 & 400 Amps.
Units
AJ
G
40 to 200 Amps.
Units
Basically - 75 & 100 Amps, are 100 Amps. & 150 &
200 Amps., are 200 Amps. Single Coil units.
Cooling conditions - by increasing the transformer oil content &
radiator surfaces are varied to derive maximum rating. Higher
capacities are fabricated by paralleling more than one 200
Amps. Coils.
300 & 400 Amps. units - (in open / OEM configuration are are
the same and are ) paralleled units of 2 Nos. Of 200 Amps. coils
interconnected through current balancing chokes - supplied
duly wired with the unit.
Similarly 500 & 600 Amps. are supplied with set of paralleling
chokes duly wired for current balancing.
GD-401-O
GD-501-O
GD-601-O
GD-751-O
GD-1001-O
GD-1501-O
GD-2001-O
GD-3001-O
GD-4001-O
GD-5001-O
GD-6001-O
GD-401-S
GD-501-S
GD-601-S
GD-751-S
GD-1001-S
GD-1501-S
GD-403-S
GD-503-S
GD-603-S
GD-753-S
GD-1003-S
GD-1503-S
533.4
533.4
533.4
635.0
635.0
787.4
787.4
939.8
939.8
1320.8
1320.8
850
850
850
1075
1075
1175
850
850
850
1075
1075
1175
482.6
482.6
482.6
609.6
609.6
609.6
609.6
609.6
609.6
609.6
609.6
480
480
480
600
600
600
480
480
480
600
600
600
381
381
381
482.6
482.6
482.6
482.6
482.6
482.6
482.6
482.6
480
480
480
590
590
590
355.6
355.6
355.6
431.8
431.8
431.8
431.8
431.8
431.8
431.8
431.8
355
355
355
415
415
415
355
355
355
415
415
415
406.4
406.4
406.4
533.4
533.4
533.4
533.4
533.4
533.4
533.4
533.4
415
415
415
525
525
525
381
381
381
482.6
482.6
482.6
482.6
482.6
482.6
482.6
482.6
340
340
340
420
420
470
340
340
340
420
420
470
229
229
229
330
330
330
330
330
330
330
330
127
127
127
152
152
152
152
152
152
152
152
356
356
356
406
406
457
457
660
660
1143
1143
Wt.
Wt.
Wt.
Wt.
Wt.
37.5
37.5
37.5
55.5
55.5
76.0
76.0
145
145
200
200
40 - 600 AMPS - 1 PHASE - OPEN / OEMUNITS/ OIL NATURAL COOLED USE
Special Single Phase unit for Servo
Special Single Phase unit for Servo
E
D
C
B
G
F
A
E
D
C
B
J
F
A
Special OEM units for Servo Stabilisers
and other applicationswith
free down space for fitting additional transformers etc.
700
700
700
895
895
995
700
700
700
895
895
995
41.0
41.0
41.0
64.0
64.0
64.0
1240
1240
1240
1520
1520
1520
1180
1180
1180
1460
1460
1460
104.0
104.0
104.0
156.0
156.0
156.0
Variable Voltage
Auto TransformerDIMENSIONS SHEET PAGE 3
Green
Dot

4. Rating Amps
Rating Amps
Input
Volts
No. Of
Phase
Input
Volts
Amps
Amps
Output
Volts
Output
Volts
DIMENSIONS (in mm)
DIMENSIONS (in mm)
A
A
B
B
C
C
D
D
E
E
F
F G H I J
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
415
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-470
0-4 70
0-470
0-470
0-470
0-470
0-470
0-470
0-470
40
50
60
75
100
150
200
300
400
500
600
3
3
3
3
3
3
3
3
3
3
3
40
50
60
75
100
150
200
940
940
940
1200
1200
1350
1350
1480
1480
1580
1580
940
940
940
1200
1200
1340
1340
410
820
820
890
1050
1050
1200
1630
1780
2240
2390
480
480
480
600
600
600
600
Wt.
In Kgs.
Wt.
In Kgs.
Oil
Reqrd.
3 P H A S E M O T O R I S E D O I L C O O L E D T Y P E I N T A N K
3 PHASE MOTORISED OIL COOLED TYPE IN TANK
3 PHASE AIR NATURAL COOLED UNIT
A
CB
ED
F
A
F
CB
D E
B
A
C
D E
F
DESIGNS / SHAPES / DIMENSIONS subject to change to
suit improvements in designs & production facilities and
Customer’s usage duty cycle etc.
GD-403-T-10M-15
GD-401-T-10M-15
GD-501-T-10M-15
GD-601-T-10M-15
GD-751-T
GD-1001-T
GD-603-T-10M-15
GD-753-T-10M-15
GD-1003-T-10M-15
GD-2003-T-10M-15
GD-3003-T-20M-15
with increased
layers of tubes
GD-4003-T-40M-15
with increased
layers of tubes
GD-6003-T-60M-15
GD-8003-T-60M-15
GD-403-T-10M-15
GD-403-T-10M-15
GD-503-T-10M-15
GD-603-T-10M-15
GD-753-T-10M-15
GD-1003-T-10M-15
GD-1503-T-10M-15
GD-2003-T-10M-15
GD-3003-T-20M-15
GD-4003-T-20M-15
GD-5003-T-40M-15
GD-6003-T-40M-15
D-403-O
D-503-O
D-603-O
D-753-O
D-1003-O
D-1503-O
D-2003-O
540
540
930
1030
1180
1180
1330
1180
1330
1380
1530
380
380
380
460
460
460
460
520
520
520
620
620
620
620
620
620
670
670
355
355
355
415
415
415
415
410
410
410
490
490
490
490
1070
1070
1530
1530
420
415
415
520
520
520
520
770
770
770
1020
1020
1150
1150
1220
1220
1330
1330
385
385
385
485
485
485
485
200
200
200
200
200
200
200
165
185
206
305
350
410
500
700
800
1100
1300
96.5
96.5
96.5
142.5
142.5
172.0
172.0
115
125
130
250
275
330
385
675
1000
1200
1400
235
235
235
324
324
324
324
123
123
123
153
153
153
153
760
760
760
1000
1000
1140
1140
AJ
G
Variable Voltage
Auto Transformer
Green
Dot DIMENSIONS SHEET PAGE 4