KNIFE SWITCHES Filnor has over 700 standard Knife Switces listed. The electrical rating of the switches range from 30 Amperes at 250 Volts AC/DC to 6000 Amperes at 600 Volts AC/DC. All of these standard switches carry the Underwriters Laboratories listing. NEW !   Knife Switch Catalog Download the all new Filnor Knife Switch Catalog in PDF format. We have conveniently separated the catalog into sections A - F, or you may downoad the entire catalog in one file. Knife Switch Catalog Full 9 MB Section A - Type A Front Connected Knife Switches 3.4 MB Section B - Type D Back Connected Knife Switches 3.5 MB Section C - Type L Back Connected Knife Switches 3.1 MB Section D - Fuse Blocks 1.1 MB Section E - Dimensions 3.9 MB Section F - Maintenance 1.9 MB

HEAVY-DUTY KNIFE SWITCHES SECTION A Class 9850 Front Connected Knife Switches Type A, single-throw and double-throw, not-fusible knife switches have a corrosion resistant finish, are mounted on GPO-3 bases and have high clips and hinges. The high clips and hinges simplify the front-of-board connections. Available 30 Amp thru 2000 Amp. Fusible Type A knife switches are arranged with fuse holders which will accept standard National Electric Code fuses. When mounted on a panel the single-throw switch is fusible at the bottom. Available 30 Amp through 600 Amp at 250, 480 or 600 volt. Ratings: Ampere ratings of Type A, not fusible, knife switches are based on a temperature rise of not more than 30 degrees C. above an ambient temperature of not more than 40 degrees C. when mounted in open air. Enclosed ratings are based on the switches being mounted in enclosures with adequate ventilation and with bus or cable of appropriate size. SPECIAL SWITCHES Special switches are available. We may already have a design for what you require, if not, our Engineering Dept. will investigate and tell you if we can build it. Please contact us for your special switch requirements. SPARE PARTS Spare parts are available for all Knife Switches and Fuse Clips. Accessories are also available for adding to Knife Switches. Open knife switches are used as disconnect switches mounted on switchboards, distribution and control panelboards. Extensive uses of knife switches are found in the heavy industries and laboratories, for control and test panels, where visible disconnects are required. Type A, single-throw, not-fusible knife switches have a corrosion resistant finishh, are mounted on GPO-3 bases and have high clips and hinges. The high clips and hinges simplify the front-of-board connection. TYPE A FRONT-CONNECTED, HEAVY-DUTY KNIFE SWITCHES Double-Throw, Not Fusible Type A, double-throw, not-fusible knife switches are similar in construction to the single-throw version. For applications where it is necessary to manually transfer between two power supplies or two loads, the double-throw switches are particulary well suited. TYPE A FRONT-CONNECTED, HEAVY-DUTY KNIFE SWITCHES Single-Throw, Fusible Fusible Type A knife switches are arranged with fuse holders which will accept standard National Electric Code fuses. When mounted on a panel the single-throw switch is fusible at the bottom. TYPE A FRONT-CONNECTED, HEAVY-DUTY KNIFE SWITCHES Double-Throw, Fusible Fusible, double-throw, Type A knife switches are fusible on both throws. In order to provide clearance between the handle and the fuses, these switches are constructed with low hinges and high clips. TYPE A FRONT-CONNECTED, HEAVY-DUTY KNIFE SWITCHES Single or Double-Throw, Not Fusible, Field Discharge Switches Field Discharge Switches are used to overcome the high inductive current caused by suddenly opening a generator field. When opening the generator circuit, the field discharge switch closes the field across a resistor allowing the inductive discharge to die out gradually, which might otherwise result in a rupture of field insulation. Upon opening these two-pole swithes the discharge blade, which is an offset extension of one of the main blades, makes contact with a high clip. The high clip, which is connected to the resistor, is located between the hinges of the two blades. Another feature of the switch is each pole is equipped with quick-break blades. The discharge blades and the quick-break blades combine to provide a make-before-break operation. Upon opening the switch, the resistance circuit is made before the line-to-field circuit is broken, limiting the field discharge voltage. When closing the switch the discharge blade breaks the resistance circuit before the main blades make contact. POLARITY REVERSING SWITCHES Another version of the Type A knife Switch is the Polarity Reversing Switch. This switch is two-pole, double-throw and is equipped with rocker-type blades. The cross-connection, used to give the reversing action, is made of copper bus straps mounted between the poles of the front of the switch.

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