These are designed for heavy duty Mill & Crane duty frequent operations suitable for voltage upto 600 Volts DC. Contactors are designed for mechanical duty Class 10 as per IS: 2959:1975. Rating ranging from 50Amps upto 600Amps are available in four types: 1) Single Pole D.C Contactor 2) Double Pole D.C. Contactor. 3) Triple Pole D.C Contactor 4) Four Pole D.C. Contactor. Details require for enquiry from clients are Current Range, Nos. of Poles, ACDC, No. of Auxiliary Contacts, Operating Coils Voltage & type of Main Contacts –normally open or closed.