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S.S. Punch Grid Resistance Box
S.S. Punch Grid Resistance Box
Introduction
ROLEX make resistance boxes are designed to meet requirements of A.C & D.C. application for E.O.T. Cranes, Winches, Rubber Mills, Flour Mills, Coal Mines, Cement Mills, Power Plants, Conveyors, Coke Oven, Blowers etc. for Speed control and developing Starting Torque.
Assembly and Function
Rolex punched Steel resistance boxes Consist of Grids Punched from Nickel Chromium Steel Alloy Sheet. These grids are shock and vibration proof. These resistors are specially suited for Steel mill duty. Coal mines etc. These resistors are available in a wide range of Current ratings from 7 Amps to 800 Amps continuous. The series connection between adjacent grids is by means of copper jumpers. The resistors, after overloads of moderate duration become red hot but no damage is caused and retains their shape after overload disappears..
Technical Specification
|
Body Material |
G.I. Sheet |
|
Enclosure |
IP-44 |
|
Mounting Position |
Floor |
|
Cable entry |
Bottom |
|
Current rating |
7-800 amps |
|
Cooling |
Air cooled |
|
Temperature rise |
2250 °C / 2500 °C / 3750 °C |
|
Rated Value (Ohms) |
Grid Type |
Current rating for various duty factors(Amps) |
|||
|
25% ED |
40% ED |
60% ED |
100% ED |
||
|
0.010 |
WG 10 |
435 |
360 |
310 |
260 |
|
0.022 |
WG 22 |
295 |
243 |
210 |
175 |
|
0.032 |
WG 32 |
244 |
202 |
170 |
145 |
|
0.046 |
WG 46 |
205 |
168 |
145 |
122 |
|
0.068 |
WG 68 |
168 |
140 |
120 |
100 |
|
0.100 |
WG 100 |
138 |
114 |
97 |
82 |
|
0.150 |
WG 150 |
112 |
93 |
79 |
67 |
|
0.220 |
WG 220 |
92 |
77 |
65 |
55 |
|
0.300 |
WG 300 |
78 |
65 |
55 |
47 |
|
0.460 |
WG 460 |
64 |
53 |
45 |
38 |
|
0.750 |
WG 750 |
53 |
45 |
38 |
31 |
|
1.000 |
WG 1000 |
44 |
36 |
31 |
26 |
|
1.500 |
WG 1500 |
35 |
30 |
25 |
21 |
|
2.500 |
WG 2500 |
28 |
25 |
20 |
16 |
- Economical
- Less Weight
- Spares Easily Available
- Easy For Maintenance
- Special Anti-vibration method adopted