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DB High Current Switches by Filnor, Inc |
| High Current Switches for non-load switching for bus disconnecting or transfer erectifier disconnect polarity reversing. Ideal for electrolytic cell (cell shorting). |
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DB HIGH CURRENT SWITCHES |
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High Current Switches for non-load switching for bus disconnecting or transfer erectifier disconnect polarity reversing. Ideal for electrolytic cell (cell shorting).   SOME OF OUR SWITCH CAPABILITIES • Bolted Pressure Contact Switches • Grounding Switches • Hook Stick Switches • Knife Switches • Special Design Switches • Transfer Switches • Test Switches |
Modular Construction. Basic switch modules are available in nominal ratings of 3000 to 9000 amperes, in 1000 ampere increments. Higher ampere ratings are obtained by combining two or more modules into one assembly. Modules can be factory assembled to provide single-pole, double-throw as well as multiple-pole devices. Configurations can be developed to match special bus structures. Type DB high-current switches were developed to provide a reliable, uncomplicated and economical means of switching circuits which carry large AC or DC currents. Typical applications are as non load-break disconnects for electric furnaces, rectifiers, metal plating apparatus, and large DC motors; also as load-break shorting switches for electro-chemical industry cells and similar installations which demand high-current capacity and dependable performance under adverse conditions. Disconnect Switches:  Contacts of Type DB switches are double-break with a wiping action that is self-cleaning. The double rows of contact bars, one above and one below the terminals, are self-aligning. Each contact bar has its own stainless steel pressure spring which assures proper contact pressure under the most adverse operating conditions. Parallel construction of the movable contacts provides magnetic forces which supplement the contact pressure of the stainless steel springs. Terminals are silver plated copper bars with slotted holes to make field alignment of multiple switches a simple matter. The end of each terminal which connects with the main moving contacts is beveled to make the switch close easily. They are silver plated for greater contact efficiency and protection against corrosion. Cover Plates for DC switches are constructed of sturdy steel with protective coatings to withstand the corrosive environments frequently encountered in this type of switch application. Cover plates for AC switches are made of glass polyester to avoid eddy-current losses and to provide additional insulation for the higher voltages which are common to AC installations. Driver Mechanism is arranged so that the switch cannot be damaged due to overtravel. In the closed position there is no tendency of the contact springs to bias the contacts toward the open position because spring action of the contacts is not in the same plane as the motion of the driving mechanism. Adjustment of the mechanism is not critical. Installation with as much as plus or minus ten degrees from 'dead center' closed position can be tolerated without reduction contact area or contact pressure. Easy Maintenance. Husky bolts clamp the terminals between the cover plates and insulators. All other principal parts are positioned and held in place by this unique construction of the switch. If maintenance is required, Type DB switches can be easily reassembled without special jigs or tools. The telescoping insulators, together with the cover plates, automatically align the terminals without the gauging or adjustment of parts. |
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DB High Current Switches
