Fused short circuit and grounding switch

• US 4,314,300 A
• Filed: 11/09/1979
• Issued: 02/02/1982
• Est. Priority Date: 11/09/1979
• Status: Expired due to Term

• Current Assignee: Charles E. Griffith
• Original Assignee: Charles E. Griffith
• Inventors: Griffith, Charles E.
• Primary Examiner(s): Salce, Patrick R.
• Assistant Examiner(s): Eisenzopf, Reinhard J.
• Application Number:
  US06/092,884
• Time in Patent Office: 816 Days
• Field of Search: 361/8, 361/13, 361/55, 361/57, 361/104
• US Class Current: 361/13
• CPC Class Codes: H01H 79/00 Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected H01H39/004 takes precedence
• CPC Class Codes: H01H 9/106 fuse and switch being connected in parallel

Abstract

A fused short circuit and grounding switch for interconnection in a main circuit, the switch having a switch member operable in one position thereof as a part of the main circuit and operable in another position out of and breaking the normal continuity of the main circuit therethrough and to provide a solid bolted fault, and including an alternate circuit interconnected to and operable to be in parallel with the main circuit, the alternate circuit being fused, the switch being operable to short circuit the alternate circuit and clear the fusing thereof and to thereby interrupt the main circuit on operation of the switch member to the position thereof providing a solid bolted fault.

Claims

1. A fused short circuit and grounding switch for interconnection in a main circuit, said switch having switch means operable in one position thereof as a part of the normal continuity of said main circuit and operable in another position to break continuity therewith as a part of said main circuit and to provide a solid bolted fault, and including alternate circuit means interconnected to and operable to be in parallel with said switch means in said one position thereof as a part of the normal continuity of said main circuit and including fuse means, said switch being operable to short circuit said alternate circuit and clear said fuse means thereof and to thereby interrupt said main circuit on operation of said switch means to the position thereof providing a solid bolted fault.

2. A fused short circuit and grounding switch as specified in claim 1 wherein one terminal of said alternate circuit is attached to a conductor of said main circuit at the side of said switch interconnectable to the line side of said main circuit and another terminal thereof is interconnected to said switch means, said fuse means being positioned in said alternate circuit interjacent said first and second mentioned terminal.

3. A fused short circuit and grounding switch as specified in claim 1 and for interconnection in a main circuit wherein feed to said switch through said main circuit may be in either direction therethrough, a terminal of said alternate circuit is attached to a conductor of said main circuit at each side of said switch interconnectable to said main circuit and an intermediate terminal thereof is interconnected to said switch means, and a fuse means is positioned in said alternate circuit interjacent said first mentioned terminal and said intermediate terminal and interjacent said second mentioned terminal and said intermediate terminal.

4. A fused short circuit and grounding switch as specified in either of claims 1, 2, or 3 wherein said alternate circuit is open at a first position of said switch means in said one position thereof, said switch means being operable to close said alternate circuit on operation thereof to the position thereof providing a solid bolted fault.

5. A fused short circuit and grounding switch as specified in claim 4 wherein said switch means includes switch arm means operable in a first position to provide a first position of said switch means in said one position thereof and in which juxtaposition said alternate circuit means is open;

operable in an intermediate position as a part of the continuity of said main circuit and closing said alternate circuit means to be in parallel with said switch means; and

operable to a third position to break continuity therewith as a part of said main circuit while maintaining continuity therewith as a part of said alternate circuit means and providing a solid bolted fault therefor.

6. A fused short circuit and grounding switch as specified in either of claims 1, 2, or 3 wherein said switch means is operable manually.

7. A fused short circuit and grounding switch as specified in either of claims 1, 2, or 3 wherein said switch includes actuating means for operation of said switch means and sensor means interconnected thereto for operation of said actuating means, said sensor means being positionable remote from said switch at a location to be protected by said switch and being operable to sense a condition of such protected area warranting interruption of said main circuit.

8. A fused short circuit and grounding switch as specified in either of claims 1, 2, or 3 wherein said alternate circuit is open at a first position of said switch means in said one position thereof, said switch means being operable to close said alternate circuit on operation thereof to the position thereof providing a solid bolted fault, and said switch means is operable manually.

9. A fused short circuit and grounding switch as specified in either of claims 1, 2, or 3 wherein said alternate circuit is open at a first position of said switch means in said one position thereof, said switch means being operable to close said alternate circuit on operation thereof to the position thereof providing a solid bolted fault, said switch means includes actuating means for operation of said switch means and sensor means interconnected thereto for operation of said actuating means, said sensor means being positionable remote from said switch at a location to be protected thereby and being operable to sense a condition of such protected area warranting interruption of said main circuit.

10. A fused short circuit and grounding switch as specified in claim 9 wherein said switch means includes switch arm means operable in a first position to provide a first position of said switch means in said one position thereof and in which juxtaposition said alternate circuit means is open;

operable in an intermediate position as a part of the continuity of said main circuit and closing said alternate circuit means to be in parallel with said switch means; and

operable to a third position to break continuity therewith as a part of said main circuit while maintaining continuity therewith as a part of said alternate circuit means and providing a solid bolted fault therefor.

20. A fused short circuit and grounding switch as specified in claim 9 wherein said detent means includes solenoid means for release thereof.

21. A fused short circuit and grounding switch as specified in claim 20 wherein said sensor means comprises a temperature sensing switch.

22. A fused short circuit and grounding switch as specified in claim 20 wherein said sensor comprises a eutectic device.

11. A fused short circuit and grounding switch for interconnection in a main circuit to isolate one side of a main circuit from another side thereof, as by way of isolating the line phase conductors of a circuit from the load phase conductors thereof, and in isolating one part of a network main from another part thereof, said switch including switch means having a movable switch arm and at least first and second switch arm contacts, one said contacts including conductor means for interconnection to one side of a main circuit conductor and the other of said contacts including conductor means for interconnection with a ground, conductor means operably engageable with said switch arm and interconnectable to the other side of the main circuit conductor, said switch arm being operable in a first position thereof to engage said one said contacts for continuity of the main circuit from said one said contacts and through said switch arm to said conductor means operably engageable therewith, an alternate circuit having fuse means therein, one terminal of said alternate circuit being attached to said conductor means of said one said contacts and another terminal thereof being operably engageable with said switch arm, said switch arm being movable from said first position thereof to a second position out of engagement with said one said contacts and to engage said other of said contacts for continuity of said alternate circuit from said another terminal operably engageable with said switch arm and through said switch arm to said other of said contacts to short circuit said alternate circuit and provide a solid bolted fault to clear said fuse means and interrupt said main circuit, and actuating means for movement of said switch arm to said first and second positions thereof.

12. A fused short circuit and grounding switch as specified in claim 11 wherein said one said contacts comprises a first contact and said other of said contacts comprises a second contact, and wherein said switch means includes third and fourth contacts, said third contact including said conductor means interconnectable to said other side of the main circuit conductor and said another terminal of said alternate circuit is interconnected to said fourth contact.

13. A fused short circuit and grounding switch as specified in claim 12 wherein said alternate circuit includes a second segment having fuse means therein, one terminal of said second segment being interconnected to said fourth contact and the other terminal thereof being interconnected to said conductor means of said third contact.

14. A fused short circuit and grounding switch as specified in claim 12 wherein said switch means includes a second alternate circuit having fuse means therein, and said switch includes a fifth contact means, one terminal of said second alternate circuit being interconnected to said fifth contact and the other terminal thereof being interconnected to said conductor means interconnectable to said the other side of the main circuit conductor, said switch arm including means operably engageable with said fifth contact in said second position thereof for continuity of said second alternate circuit from said fifth contact to said second contact to short circuit said second alternate circuit and provide a solid bolted fault to clear said fuse means thereof.

15. A fused short circuit and grounding switch as specified in claim 14 wherein said switch arm is operable to a position intermediate said first and second position thereof in continuity with said main circuit and said alternate circuit means;

and wherein in said second position thereof said switch arm is juxtaposed to break continuity therewith as a part of said main circuit while maintaining continuity therewith as a part of said alternate circuit means and providing a solid bolted fault therefor.

16. A fused short circuit and grounding switch as specified in claim 15 wherein said actuating means includes detent means for maintaining said switch arm in said first position thereof, means for moving said switch arm to said intermediate and then said second position thereof on release of said detent means, and means to reset said switch arm from said second to said first position thereof;

and wherein said switch includes sensor means operably interconnected to said detent means for release thereof, said sensor means being positionable remote from said switch at a location to be protected by said switch and being operable to sense a condition of such protected area warranting interruption of said main circuit.

17. A fused short circuit and grounding switch as specified in either of claims 11, 12, 13, or 14 wherein said actuating means includes detent means for maintaining said switch arm in said first position thereof, means for moving said switch arm to said second position thereof on release of said detent means, and means to reset said switch arm from said second to said first position thereof.

18. A fused short circuit and grounding switch as specified in claim 17 wherein said means for moving said switch arm to said second position thereof comprises spring means and said means to reset said switch arm from said second to said first position thereof is operable manually.

19. A fused short circuit and grounding switch as specified in claim 17 wherein said switch includes sensor means operably interconnected to said detent means for release thereof, said sensor means being positionable remote from said switch at a location to be protected by said switch and being operable to sense a condition of such protected area warranting interruption of said main circuit.

23. A fused short circuit and grounding switch as specified in claim 17 wherein said detent means is manually releasable.