Wire Wound Rheostats

A Rheostat is used to raise or lower the resistance of a circuit and correspondingly to decrease or increase the current following.
 

Our Rheostat are manufactured in a very wide range. which are being used in electronic industries , schools, collages laboratories over decades.
A wide range of Rheostat are available from 0.1 amp. to 200 amp.*
Values from 0.5 ohms to 12000 ohms.
Customized designing available on request.
Higher wattage resistors for special applications can be made.
   
  Rheostats :
Open / Covered / GRADED /
L.S.M.-Lead Screw Motion
Range : 0.5 ohms - 12000 ohms
Power : 0.1 Amp - 200 Amp

* Selection Table available for Reference.
   
  STEAD Brand Wirewound Sliding Rheostats are spaced wound with best quality Cu/Ni or Ni/Cr Alloy Resistance Wire having very low temp. Co-efficient and wire is protected with high temp. Resistance Compound. The winding is done on vitreous enameled drawn steel tubes, fitted with aluminium die casted stands/fabricated steel stands. Phosphor Bronze or Self Lubricating Copper Graphite Contacts are fitted on brass slider, Slides on solid drawn brass rods.
 

TYPES OF WINDINGS

1. Straight Winding
2. Graded Winding
3. Non-Inductive Winding

Types of Rheostats No. of Tubes Types of Operation Types of Cooling
1. Open 1. Single 1. Sliding 1. Natural
2. Perforated 2. Double 2. Gear 2. Forced Air
3. Lead Screw Motion 3. Multiple 3. Power 3. Oil Cooled
Standard Tolerance + 10% but closer tolerance can also be supplied on request :
       
TYPE OF MOUNTING INSULATION TEST    
Front of Panel Mounting 2000 Volts AC    
Back of Panel Mounting      
 
MODEL No. ROUND TUBE MODEL No.
HEXAGONAL TUBE
Single Tube
Double Tube
Tube Dia. Cm.
Min. Length cm.
Max. Length cm.
Tube Dia. cm.
Min. Length cm.
Max Length cm.
SOR-1
SOR-2

DOR-S-1
DOR-S-2
DOR-S-3
4.3 (1-3/4")
6.2 (2-1/2")
10 (4")
15 (6")
15
15
40
50
60
60
80
100
SOH-1 3.7 (1-1/2")
SOH-2 2 5.1 (2")
SOH-3 (2-1/2")
15
20
35
30
50
50

SPECIAL FEATURES :

FORMER - Vitreous enamelled steel tube or Vitrified Ceramic.

SLIDER - Pressure Die Casted Metal Slider.

END BRACKET - Pressure die casted Metal Stand or Steel Fabricated Stands.

WIRE - Cupro-Nickel Alloy / Nickel-Chromium Alloy having a negligible temperature co-efficient.
Manganin Wire Wound Rheostats on request.

SLIDER KNOB Made of Bakelite having good finger grip.

* 'SOR' means Single Open Round, 'DOR' means Double Open Round,
'SOH' means Single Open Hexagonal, 'LSM' means Lead Screw Motion

SINGLE TUBE:DIA 3.7 CMS.(1.5)"
Length in cm.
15
20
25
30
35
40
45
50
AMPS.
OHMS
9
1.5
2.1
3
3.9
4.7
5.6
6.4
7.3
7.5
2.6
3.9
5.3
6.7
8.1
9.4
10.8
12
5.5
3.9
5.6
7.7
9.4
11.1
12.9
15.4
17.1
5
4.9
7.3
9.9
12.4
15
17.1
19.3
22
4.5
6.9
10.3
13.7
17.1
1920.6
24
28
31
4
9.4
13.7
19
23
29
33
38
43
3.2
13
19
26
32
39
45
52
58
2.8
20
30
40
49
60
69
77
86
2.3
32
47
64
79
95
110
127
141
1.8
45
64
86
107
129
150
171
193
1.6
55
82
110
137
163
189
214
249
1.4
77
116
155
193
231
270
304
339
1.2
99
150
201
240
300
347
394
441
1
137
205
275
343
411
480
549
617
0.9
171
257
343
430
515
600
686
772
0.8
231
343
465
575
686
797
917
1029
0.7
291
437
585
729
875
1011
1157
1303
0.6
342
515
685
857
1029
1200
1423
1543
0.5
454
685
910
1136
1363
1590
1817
2044
0.4
565
836
1115
1393
1672
1950
1817
2044
0.35
685
1029
1371
1715
2057
2400
2743
3086
0.3
900
1371
1845
2315
2743
3171
3600
4071
 

 

RANGE IN OHMS.
SINGLE TUBE
TUBE IN DIA
3.7 CMS(1.5)"
5 CMS(2)"
6.3 CMS(2.5)"
Length in cm.
15
20
25
30
20
30
40
50
20
30
40
AMPS.
OHMS
0.3
800
1200
1650
2000
1600
2750
3900
5000
1725
2950
4250
0.6
260
400
525
650
500
850
1200
1500
550
950
1350
1.2
110
160
210
270
220
360
500
350
250
410
570
1.7
45
65
85
110
80
140
200
260
90
160
230
2.8
21
32
43
55
40
70
100
125
45
75
110
5
7.5
11
14.5
18
15
25
35
45
17
28
40
8.5
2.6
4
5.2
6.5
6
9
12
15
7
10.5
14
12
1.2
2
2.5
3
2.4
4.2
6
7.8
2.8
4.8
7
15
0.6
0.9
1.1
1.4
1.3
2
2.7
3.4
1.5
2.4
3.3
18
0.4
0.6
0.8
1
0.8
1.4
2
2.4
0.9
1.6
2.3
 
Rheostats:Open
Hexagonal Single Tube
  
SINGLE TUBE:DIA 4.3 CMS.(1.75)"
Length in cm.
15
20
25
30
35
40
45
50
AMPS.
OHMS
9
1.7
2.5
3.5
4.5
5.5
6.5
7.5
8.5
7.5
3
4.6
6.2
7.8
9.4
11
12.6
14
5.5
4.5
6.5
6.2
7.8
9.4
11
12.6
14
5
5.7
8.5
11.5
14.5
17.5
20
22.5
25
4.5
8
12
16
20
24
28
32
36
4
11
16
22
27
33
38
44
50
3.2
15
22
30
37
45
52
60
67
2.8
23
34
46
57
70
80
90
100
2.3
37
55
74
92
110
128
148
165
1.8
50
76
100
125
150
175
200
225
1.6
64
96
128
160
190
220
250
290
1.4
90
135
180
225
270
315
355
395
1.2
115
175
235
280
350
405
460
515
1
160
240
320
400
480
560
640
720
0.9
200
300
400
500
600
700
800
900
0.8
270
400
540
670
800
930
1070
1200
0.7
340
510
680
850
1020
1180
1350
1520
0.6
400
600
800
1000
1200
1400
1660
1800
0.5
530
800
1060
1325
1590
1855
2120
2385
0.4
660
975
1300
1625
1950
2275
2640
2950
0.35
800
1200
1600
2000
2400
2800
3200
3600
0.3
1050
1600
2150
2700
3200
3700
4200
4750

 

SINGLE TUBE:DIA 6.2 CMS.(2.5)"
Length in cm.
15
20
25
30
35
40
45
50
AMPS.
OHMS
9
2
3
4.5
5.5
7
8
9
10
7.5
3.7
5.7
7.7
9.7
11.5
13.5
15.5
17.5
5.5
5.5
8
11
14
17
20
23
26
5
6.5
10
14
17.5
21.5
25
28.5
32
4.5
10
15
20
25
30
35
40
45
4
14
20
28
34
42
48
58
65
3.2
19
28
38
48
57
66
76
86
2.8
26
41
56
71
86
100
114
128
2.3
47
70
95
110
130
160
185
210
1.8
64
96
125
160
190
225
250
290
1.6
82
120
160
200
245
285
325
360
1.4
115
170
230
290
345
400
450
500
1.2
150
225
295
365
445
520
590
675
1
200
300
400
500
600
700
800
900
0.9
250
375
500
625
750
875
1000
1125
0.8
345
510
675
835
1000
1165
1340
1500
0.7
425
635
845
1050
1260
1470
1680
1890
0.6
500
750
1000
1250
1500
1750
2000
2250
0.5
660
1000
1340
1680
2000
2350
2730
3020
0.4
840
1250
1650
2070
2500
2900
3350
3750
0.35
1000
1500
2000
2500
3000
3500
4000
4500
0.3
1300
1950
2600
3250
3900
4600
5300
6000

 

DUAL TUBE:DIA 6.2 CMS.(2.5)" SERIES CONNECTION
Length in cm.
15
20
25
30
35
40
45
50
AMPS.
OHMS
9
4
6
9
11
14
16
18
20
7.5
7.2
11.2
15
19.4
23
27
31
35
6.5
9.5
14
19
24
28
33
38
43
5.5
11
16
22
28
35
40
46
52
5
13
20
28
35
43
50
57
64
4.5
20
30
40
50
60
70
80
90
4
28
40
56
59
84
96
115
130
3.2
38
56
76
96
115
130
150
170
2.8
52
82
112
140
170
200
228
255
2.3
94
140
190
220
270
320
365
425
1.8
125
190
250
320
380
450
510
580
1.6
160
240
320
400
490
560
650
720
1.4
230
340
460
580
690
800
900
1000
1.1
300
450
590
730
890
1040
1180
1350
0.8
400
600
800
1000
1200
1400
1600
1800
0.7
500
750
1000
1250
1500
1750
2000
2250
0.6
690
1020
1350
1670
2000
2300
2680
3000
0.55
850
1270
1650
2100
2500
2900
3350
3750
0.5
1000
1500
2000
2500
3000
3500
4000
4500
0.45
1320
2000
2680
3360
4000
4700
5450
6140
0.4
1680
2500
3300
4100
5000
5800
6700
7560
0.35
2000
3000
4000
5000
6000
7000
8000
9000
0.3
2600
3900
5200
6500
7800
9200
10600
12000

 

 
RANGE IN OHMS.
DUAL TUBE:DIA 6.2 CMS.(2.5)" PARALLEL CONNECTION
Length in cm.
15
20
25
30
35
40
45
50
AMPS.
OHMS
50
0.11
0.17
0.23
0.3
0.35
0.4
0.47
0.55
40
0.2
0.3
0.44
0.55
0.7
0.8
0.9
1
36
0.25
0.37
0.55
0.67
0.87
1
1.1
1.25
30
0.45
0.7
0.95
1.2
1.4
1.7
1.9
2.2
22
0.65
1
1.37
1.7
2.1
2.5
2.7
3.2
20
0.8
1.2
1.75
2.2
2.8
3.2
3.6
4
18
1
1.5
2.2
2.7
3.5
4
4.5
5
15
1.8
2.8
3.8
4.8
5.8
6.8
7.8
8.7
11
2.7
4
5.5
7
8.5
10
11.5
13
9
5
7.5
10
12.5
15
17.5
20
22.5
7.5
7
10
14
17
21
24
28
32
6.5
9.5
14
19
24
28
33
38
43
5.5
13
20
27
35
42
50
55
65
4.5
23
35
47
55
65
80
90
105
3.5
32
48
60
80
95
110
125
140
3.1
40
60
80
100
120
140
165
180
2.8
55
85
115
145
170
200
225
250
2.4
75
110
145
180
220
260
290
336
2
100
150
200
250
300
350
400
450
Rheostats:Covered
L.S.M.-Lead Screw Motion

Rheostates:Open
Round Double Tube
Rheostats:Open
Round Single Tube

Rheostats:Covered
L.S.M-Lead Screw Motion

 

  
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