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Knife SwitchFilnor manufactures over 700 standard knife switches. |
| Filnor, Inc. has over 700 standard knife switches 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 our standard switches carry the Underwriters Laboratories listing. | |||
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| Additional information about knife switchs can be found on the Filnor Inc. website knife switch, knife switches, front connected knife switch, special switches, single-throw, double-throw, not-fusible knife switches, type A knife, heavy-duty knife switch, fusible, field discharge switches, polarity reversing switches, by Filnor Inc. 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.
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. SECTION B Class 9851 Back Connected Knife Switches with Stud and Nut Terminations Construction: All current carrying parts of Type D knife switches are milled and provided with a corrosion resistant finish. Designed for back-connection, these switches are furnished without bases for mounting on insulating panels for customers' switchnboards. Switches rated 1200 amperes and larger are shipped on throw-away bases as standard. Prices will be quoted upon request for switches, rated 800 amperes and smaller, mounted on throw-away bases. Connection are made to Type D switches by means of round studs of hard-drawn copper. Switches rated 600 amperes and smaller are furnished with studs to fit boards from 1/2" to 2" thick. Fusible hinge switches have steel studs and nuts that fit any board 1/2" to 2" thick. The steel studs and screws are only for mounting purposes. No electrical connections are made to fusible hinges. 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. Available 60 Amp thru 200 Amp. Larger sizes available upon special order. Ratings: Ampere ratings of Type D, not fusible knife switches are based on a temperature rise of not more than 30 degree C. above an ambient temperature of not more than 40 degrees C. when mounted in open air. Enclose ratings are based on the switches being mounted in enclosures with adequate ventilation and with bus or cable of appropriate size. Fusible switches are not to be loaded continuously at more than 80 percent of the fuse rating. TYPE D BACK CONNECTED KNIFE SWITCHES - Single-throw, Not fusible Open knife switches are used as disconnect switches mounted on switchboards, distribution and control panelboards. Extensive use of knife switches areund in the heavy industries and laboratories, for control and test panels, where visible disconnects are rquired. Type D, single-throw, not fusible knife switches have a corrosion resistant finish and low hinges and clips. Designed for back-connection, these switches are furnished without bases for mounting on insulating panels of customers' switchboards. Type D switches can also be furnished mounted on insulating panels. Prices are quoted upon receipt of compete information including panel size. TYPE D BACK CONNECTED KNIFE SWITCHES - Double-throw, Not fusible Type D, 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 particularly well suited. TYPE D BACK CONNECTED KNIFE SWITCHES - Single-throw, fusible Fusible Type D knife switches are arranged with fuse holders which will accept standard National Electrical Code fuses. When mounted on a panel the single-throw switch is fusible at the bottom. TYPE D BACK CONNECTED KNIFE SWITCHES - Double-throw, fusible Fusible, double throw, Type D knife switches are fusible in both throws. In order to provide clearance between the handle and the fuses, these switches are constructed with low hinges and high clips. TYPE D BACK CONNECTED KNIFE SWITCHES - Single or Double-throw, not fusible 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 standard 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. Connections to the hinges are made on the front with connections to the clips on the back of the switch. SECTION C Class 9852 Back Connected Knife Switches Type L with Bus Bar Laminations For Termination TYPE L BACK CONNECTED KNIFE SWITCHES Type L Laminated-stud switches are made in capacities of 800 amperes and larger and are designed as isolation or disconnect switches. Designed for heavy-duty service on switchboards or individual panels, these switches comply with all requirements of the National Electric Code. Aux. Switches can be supplied if required. For factory mounting on GPO-3 or other insultation panels, prices will be quoted upon receipt of panel sizes and full informtion. Switches available from 800 amperes through 6000 amperes or Standard design. Specials available. Polarity Reversing Switches: Another version of the Type L Knife Switch is the Polarity Reversing Switch. This switch is two-pole, double-throw. The cross-connections, used to give the reversing action, are made of copper bus straps mounted on the back of the switch. Back connections are made to horizontal laminated studs. Due to the compactness of the switch the terminals are available only in the horizontal direction. Standard designs for low voltage, specials available in higher voltage. TYPE L BACK CONNECTED KNIFE SWITCHES - Single throw, not fusible Type L laminated-stud switches are made in capacities of 800 amperes and larger and are used as isolation or disconnect switches. Designed for heavy-duty service on switchboards or individual panels, these switches comply with all requirements of the National Electric Code. Ampere ratings are based on a temperature rise of not more than 30 degrees C. above an ambient temperature of 40 degrees C. Current-carrying parts of rugged milled construction are made from hard-drawn copper of 98% conductivity. Hinges, clips and stud leaves are solidly pinned and soldered into slots milled in the base blocks. All Type L switches are furnished unmounted as standard but are shipped on throw-away bases with all contacts fitted. When mounted on permanent panels the parts must be carefully aligned to secure best performance. For factory mounting on GPO-3 or other insulation panels, prices will be quoted upon receipt of panel sizes and full information. Horizontal laminations of the studs are furnished as standard on the switches. Direction of laminations can be furnished all verticle or part vertical and part horizontal to suit customers' bus or cable arrangements. Assuming the switch to be mounted with the blades vertical, the direction of the laminated terminals must be specified for both single and double-throw switches, if other than all horizontal. The customers' bus structure must be designed with adequate capacity to prevent feeding heat into the switch. On AC bus allowance must be made for skin effect, inductive heating and magnetic effects on nearby ferous metal parts. When mounting in enclosures adequate ventilation must be provided. Switches listed below are manufactured to be mounted on customers' panels of the following thicknesses: 800 and 1200 amperes, 1 1/4" ; 1600 thru 3000 ampere, 1 1/2" ; 4000 thu 6000 ampere, 2". TYPE L BACK CONNECTED KNIFE SWITCHES - Double throw, not fusible - Polarity Reversing Switches: Another version of the Type L Knife Switch is the Polarity Reversing Switch. This switch is two-pole, double-throw. The cross-connections, used to give the reversing action, are made of copper bus mounted on the back of the switch. Back connections are made to horizontal laminated studs. Due to the compactness of the switch the terminals are available only in the horizontal direction. |
Filnor, Inc. is a Certified ISO 9001 Company. |