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.

Current Rating chart for punched grid resistors for 375° c temperature rise Rated Value Ohms

Grid Type Current Rating for various duty factors(Amps)

25%ED 40%ED 60%ED 100%ED0.010 PS 10 390 325 280 2340.022 PS 22 265 220 190 1580.032 PS 32 220 182 153 1310.046 PS 46 185 151 130 1100.068 PS 68 152 126 110 900.100 PS 100 125 103 88 740.150 PS 150 101 84 72 61

0.220 PS 220 83 70 59 500.300 PS 300 82 59 50 430.460 PS 460 58 48 40 350.720 PS 720 47 39 33 281.000 PS 1000 40 33 28 241.500 PS 1500 32 27 23 192.500 PS 2500 25 21 18 154.500 PS 4500 15 13 11 8