Resistance Box

Resistors are designed to meet requirements of both A.C. & D.C. applications. The basic types of resistors are stainless steel ( Grade – 304) and punched steel resistors. These are manufactured for current rating from 10 to 800 Amps. Continuous resistors of higher ratings are manufactured using 2 or more parallel paths. Resistors with short time rating up to 3000 Amps or evenmore for neutral earthling are possible which suitable for system voltage upto 11 KV and above.

Applications:

E.O.T. cranes, rubber mills, steel mines, cement mills, power plants, conveyors, coke oven, blowers etc. for speed control and developing starting torques.

Dynamic breaking resistors for V.V.V.F.A.C Drives

Resistors are manufactured :

  1. Air cooled type
  2. Oil cooled type

Stainless steel grid resistors:

These resistors consists of stainless steel wires or strip in form of grids. The current rating generally ranges from 7 Amps to 400 Amps continuous with multiple or single paths.

Punched steel grids resistors:

he resistors consists of grids punched from correction resisting nickel chromium alloy sheet steels. The punched steel grids. The punched steel grids are completely immune to shock vibration. They function reliably under the worst operating conditions and are particularly suited for steel mill duty. These resistors are available in wide range of current rating from 8 Amps to 800 Amps continuous with single & multiple parallel paths.

Installation/ Dimensional detail of Stainless Steel Grid Type resistance boxes

Rated Value Ohms
Grid Type
Current Rating for various duty factors(Amps)
V
V
25%ED
40%ED
60%ED
100%ED
0.010
PS 10
390
325
280
234
0.022
PS 22
265
220
190
158
0.032
PS 32
220
182
153
131
0.046
PS 46
185
151
130
110
0.068
PS 68
152
126
110
90
0.100
PS 100
125
103
88
74
0.150
PS 150
101
84
72
61
0.220
PS 220
83
70
59
50
0.300
PS 300
82
59
50
43
0.460
PS 460
58
48
40
35
0.720
PS 720
47
39
33
28
1.000
PS 1000
40
33
28
24
1.500
PS 1500
32
27
23
19
2.500
PS 2500
25
21
18
15
4.500
PS 4500
15
13
11
8

Dimensional detail of Stainless Steel Wire Type Resistance Box

Installation/ Dimensional detail of Stainless Steel Grid Type resistance boxes

Unit Size
A
a
b
Unit Size
A
a
b
Unit Size
A
a
b
H
SS1
430
381
355
SL1
650
600
574
SB1
880
830
810
180
SS2
430
381
355
SL2
650
600
574
SB2
880
830
810
360
SS3
430
381
355
SL3
650
600
574
SB3
880
830
810
540
SS4
430
381
355
SL4
650
600
574
SB4
880
830
810
720
SS5
430
381
355
SL5
650
600
574
SB5
880
830
810
900
SS6
430
381
355
SL6
650
600
574
SB6
880
830
810
1080

Dimensional detail of Stainless Steel Wire Type Resistance Box

Installation/ Dimensional Detail of Punch Stainless Steel Grid Type resistance boxes

Up to 15 Grids
Up to 18 Grids
Up to 21 Grids
Up to 30 Grids
V
Max H1
Unit Size
A
a
B
Unit Size
A
a
B
Unit Size
A
a
B
Unit Size
A
a
B
H
A1
590
530
505
B1
660
600
575
C1
740
680
655
D1
890
830
805
280
350
A2
590
530
505
B2
660
600
575
C2
740
680
655
D2
890
830
805
560
630
A3
590
530
505
B3
660
600
575
C3
740
680
655
D3
890
830
805
840
910
A4
590
530
505
B4
660
600
575
C4
740
680
655
D4
890
830
805
1120
1190
A5
590
530
505
B5
660
600
575
C5
740
680
655
D5
890
830
805
1400
1470
A6
590
530
505
B6
660
600
575
C6
740
680
655
D6
890
830
805
1680
1750