Steel Wire Resistance Boxes - Corrosion Resistant Grids, 7-80 Amps Current Rating, 3750c Maximum Temperature Rise, Custom Designs Available

The Crane Control make resistance boxes are designed for both A.C. & D.C. applications. Its use is found in winches, E.O.T Cranes, Rolling Mills, Steel Plants, Flour Mills, Cement Plants, Power Plants, Coil Mines etc., for speed controlling and developing of higher starting torque. These resistance Boxes can be designed to BSS/NEMA/IEEE standards. We can also design and manufacture the resistors as per any specific standards specified by the customer. Generally the resistor grids are either made of Stainless Steel wire or Punched Steel Sheet. The Resistance boxes manufactured are suitable for a maximum temperature rise of 3750C as stipulated in BSS standards. Stainless Steel Grid Resistance Boxes :- In this case the resistor grids consist of corrosion resistant stainless steel wire or strips.Current rating generally ranges from 7 Amps to 80 amps continuous Higher ratings are possible by using multiple parallel paths. The size of the wire is determined based on the technical data of the motor on which the Resistance Box is to be connected. The drawn resistor material is uniform in section and free from any flaw or un evenness which is likely to cause local heating. Suitable sizes of strips / wire are employed to give a wide range of current ratings. The Grids are supported in such a way that the adjacent Grids cannot touch each other even under the most severe conditions of service.