Fused electrical disconnect device for high current applications

• US 6,781,809 B2
• Filed: 02/21/2001
• Issued: 08/24/2004
• Est. Priority Date: 02/21/2001
• Status: Expired due to Term

• Current Assignee: Canadian Shunt Industries Limited
• Original Assignee: Canadian Shunt Industries Limited
• Inventors: Milanczak, Edwin
• Primary Examiner(s): Leja, Ronald
• Application Number:
  US09/789,918
• Publication Number:
  US 20020114117A1
• Time in Patent Office: 1,280 Days
• Field of Search: 361/103, 361/104, 361/91.1, 439/621, 439/622, 340/590, 340/638, 340/652, 337/142, 337/158, 337/159, 337/161, 337/162, 337/168, 337/181, 337/186-189, 337/194, 337/195, 337/201, 337/206, 337/208, 337/213, 337/215, 337/216, 337/221, 337/227, 337/228, 337/251-153, 337/260-266
• US Class Current: 361/104
• CPC Class Codes: H01H 85/204 for low voltage fuses with knife-blade end contacts
• CPC Class Codes: H01H 85/30 Means for indicating condition of fuse structurally associated with the fuse
• CPC Class Codes: H01H 85/306 acting on an auxiliary switch or contact
• CPC Class Codes: H01H 85/56 the intermediate or auxiliary part having side contacts for plugging into the base, e.g. bridge-carrier type

Abstract

A fused electrical disconnect device includes a housing defining a cartridge receptacle. A line interface and a load interface are disposed within the receptacle. A line terminal extends into the body and is in electrical communication with the line interface. A load terminal also extends into the body and is in electrical communication with the load interface. A fuse holding cartridge is removably insertable into the cartridge receptacle and releasably accommodates a load protection fuse. The fuse holding cartridge establishes an electrical current path between the line and load interfaces when the fuse holding cartridge accommodates a load protection fuse and is inserted into the cartridge receptacle. An alarm signal circuit is also in electrical communication with the line and load terminals. The alarm signal circuit generates an alarm signal when the electrical current path is interrupted and the line and load terminals are electrically coupled to a power source and a load respectively.

Claims

1. A fused electrical disconnect device comprising:

a housing defining a cartridge receptacle and including a line interface and a load interface within said receptacle;

a line terminal extending into said body and being in electrical communication with said line interface;

a load terminal extending into said body and being in electrical communication with said load interface;

a fuse holding cartridge removably insertable into said cartridge receptacle and releasably accommodating a load protection fuse, said fuse holding cartridge establishing an electrical current path between said line and load interfaces when said fuse holding cartridge accommodates a load protection fuse and is inserted into said cartridge receptacle, said fuse holding cartridge comprising a pair of resilient spring elements to engage said line and load interfaces thereby to retain said fuse holding cartridge in said cartridge receptacle; and

an alarm signal circuit in electrical communication with said line and load terminals, said alarm signal circuit generating an alarm signal when said electrical current path is interrupted and said line and load terminals are electrically coupled to a power source and load respectively.

2. A fused electrical disconnect device as defined in claim 1 wherein said alarm signal circuit also generates said alarm signal when said fuse holding cartridge is removed from said cartridge receptacle and said line and load terminals are electrically coupled to said power source and load respectively.

3. A fused electrical disconnect device as defined in claim 2 wherein said alarm signal circuit includes an alarm fuse in parallel with said load protection fuse, said alarm fuse electrically coupling said line terminal to an alarm terminal when said load protection fuse fails to complete said electrical current path thereby to generate said alarm signal.

4. A fused electrical disconnect device as defined in claim 3 wherein said load protection fuse has a current rating in the range of from about 70 to 1200 amps.

5. A low voltage, high current fused electrical disconnect device comprising:

a housing defining a cartridge receptacle and including electrically conductive, laterally spaced line and load interfaces within said receptacle;

generally cylindrical, laterally spaced line and load terminals extending from said housing, said line terminal being electrically coupled to said line interface and said load terminal being electrically coupled to said load interface;

a fuse holding cartridge removably insertable into said receptacle and releasably accommodating a load protection fuse, said fuse holding cartridge establishing an electrical current path between said line and load interfaces when said fuse holding cartridge accommodates a load protection fuse and said fuse holding cartridge is inserted into said receptacle, said fuse holding cartridge comprising a pair of resilient spring elements to engage said line and load interfaces thereby to retain said fuse holding cartridge in said cartridge receptacle; and

an alarm signal circuit in electrical communication with said line and load terminals, said alarm signal circuit generating an alarm signal when said electrical current path is interrupted and said line and load terminals are electrically coupled to a power source and load respectively.

6. A fused electrical disconnect device as defined in claim 5 wherein said device is dimensioned similar to a conventional fused electrical disconnect device that does not include an alarm signal circuit.

7. A fused electrical disconnect device as defined in claim 6 wherein said alarm signal circuit includes an alarm fuse in parallel with said load protection fuse, said alarm fuse electrically coupling said line terminal to an alarm terminal when said load protection fuse fails to complete said electrical current path thereby to generate said alarm signal.

8. A fused electrical disconnect device as defined in claim 7 wherein said housing includes side walls defining said receptacle and a peripheral flange on the side walls, said flange having an alarm fuse receptacle therein to receive removably said alarm fuse.

9. A fused electrical disconnect device as defined in claim 8 wherein said alarm signal circuit includes a first conductive element extending between said load interface and a first alarm fuse contact, a second conductive element extending between said line interface and a second alarm fuse contact, and a third conductive element extending between said alarm terminal and a third alarm fuse contact, said alarm fuse engaging said first, second and third alarm fuse contacts and interconnecting said first and second alarm fuse contacts in an initial conducting state and interconnecting said second and third alarm fuse contacts in an overload or fault condition.

10. A fused electrical disconnect device as defined in claim 9 wherein said second conductive element includes a current limiting resistor disposed between said line interface and said second alarm fuse contact.

11. A fused electrical disconnect device as defined in claim 9 wherein said alarm signal circuit also generates said alarm signal when said fuse holding cartridge is removed from said cartridge receptacle.

12. A fused electrical disconnect device as defined in claim 11 wherein said load protection fuse has a current rating in the range of from about 70 to 1200 amps.

13. A fused electrical disconnect device comprising:

a housing defining a cartridge receptacle and including a line interface and a load interface within said receptacle;

a line terminal extending into said body and being in electrical communication with said line interface;

a load terminal extending into said body and being in electrical communication with said load interface;

a fuse holding cartridge removably insertable into said cartridge receptacle and releasably accommodating a load protection fuse, said fuse holding cartridge establishing an electrical current path between said line and load interfaces when said fuse holding cartridge accommodates a load protection fuse and is inserted into said cartridge receptacle, said fuse holding cartridge comprising a biased retaining mechanism to maintain said fuse holding cartridge in secure contact with said line and load interfaces; and

an alarm signal circuit in electrical communication with said line and load terminals, said alarm signal circuit generating an alarm signal when said electrical current path is interrupted and said line and load terminals are electrically coupled to a power source and load respectively.

14. A fused electrical disconnect device as defined in claim 13 wherein said biased retaining mechanism includes at least one spring clip.

15. A fused electrical disconnect device as defined in claim 14 wherein said biased retaining mechanism includes a pair of spaced spring clips, said spring clips engaging said line and load interfaces.

16. A fused electrical disconnect device as defined in claim 15 wherein each spring clip has a pair of curved arms with each arm of said pair curving in an opposite direction, said line and load interfaces when accommodated between the arms of said spring clips, separating said arms against a bias resulting in said arms being urged towards one another into secure and intimate contact with said line and load interfaces.

17. A fused electrical disconnect device as defined in claim 15 wherein said alarm signal circuit also generates said alarm signal when said fuse holding cartridge is removed from said cartridge receptacle and said line and load terminals are electrically coupled to said power source and load respectively.

18. A fused electrical disconnect device as defined in claim 17 wherein said alarm signal circuit includes an alarm fuse in parallel with said load protection fuse, said alarm fuse electrically coupling said line terminal to an alarm terminal when said load protection fuse fails to complete said electrical current path thereby to generate said alarm signal.

19. A fused electrical disconnect device as defined in claim 18 wherein said housing includes side walls defining said receptacle and a peripheral flange on the side walls, said flange having an alarm fuse receptacle therein to receive removably said alarm fuse.

20. A fused electrical disconnect device as defined in claim 19 wherein said alarm signal circuit includes a first conductive element extending between said load interface and a first alarm fuse contact, a second conductive element extending between said line interface and a second alarm fuse contact, and a third conductive element extending between said alarm terminal and a third alarm fuse contact, said alarm fuse engaging said first, second and third alarm fuse contacts and interconnecting said first and second alarm fuse contacts in an initial conducting state and interconnecting said second and third alarm fuse contacts in an overload or fault condition.

21. A fused electrical disconnect device as defined in claim 20 wherein said second conductive element includes a current limiting resistor disposed between said line interface and said second alarm fuse contact.

22. A fused electrical disconnect device as defined in claim 21 wherein said load protection fuse has a current rating in the range of from about 70 to 1200 amps.

23. A fused electrical disconnect device as defined in claim 18 wherein terminals of said load protection fuse are accommodated by said spring clips.

24. A fused electrical disconnect device as defined in claim 23 wherein each of said line and load interfaces includes at least one pair of spaced blades, the terminals of said load protection fuse being accommodated between the pairs of spaced blades, said spring clips contacting outer surfaces of the spaced blades.

25. A fused electrical disconnect device as defined in claim 24 wherein each spring clip has a pair of curved arms with each arm of said pair curving in an opposite direction, said line and load interfaces when accommodated between the arms of said spring clips, separating said arms against a bias resulting in said arms being urged towards one another into secure and intimate contact with said line and load interfaces.

26. A low voltage, high current fused electrical disconnect device comprising:

a housing having an upper surface and defining a cartridge receptacle and including electrically conductive, laterally spaced line and load interfaces within said receptacle;

laterally spaced line and load terminals extending from said housing, said line terminal being electrically coupled to said line interface and said load terminal being electrically coupled to said load interface;

a fuse holding cartridge removably insertable into said receptacle and releasably accommodating a load protection fuse, said fuse holding cartridge being flush with said upper surface and establishing an electrical current path between said line and load interfaces when said fuse holding cartridge accommodates a load protection fuse and is inserted into said receptacle, said fuse holding cartridge including bias clips to engage said line and load interfaces, thereby to retain said fuse holding cartridge in said cartridge receptacle; and

an alarm signal circuit in electrical communication with said line and load terminals, said alarm signal circuit generating an alarm signal when said electrical current path is interrupted and said line and load terminals are electrically coupled to a power source and load respectively.

27. A fused electrical disconnect device as defined in claim 26 wherein said alarm signal circuit also generates said alarm signal when said fuse holding cartridge is removed from said cartridge receptacle and said line and load terminals are electrically coupled to said power source and load respectively.

28. A fused electrical disconnect device as defined in claim 27 wherein said alarm signal circuit includes an alarm fuse in parallel with said load protection fuse, said alarm fuse electrically coupling said line terminal to an alarm terminal when said load protection fuse fails to complete said electrical current path thereby to generate said alarm signal.

29. A fused electrical disconnect device as defined in claim 28 wherein said load protection fuse has a current rating in the range of from about 70 to 1200 amps.

30. A fused electrical disconnect device as defined in claim 29 wherein said upper surface has an alarm fuse receptacle therein to receive removably said alarm fuse.

31. A fused electrical disconnect device as defined in claim 30 wherein said alarm signal circuit includes a first conductive element extending between said load interface and a first alarm fuse contact, a second conductive element extending between said line interface and a second alarm fuse contact, and a third conductive element extending between said alarm terminal and a third alarm fuse contact, said alarm fuse engaging said first, second and third alarm fuse contacts and interconnecting said first and second alarm fuse contacts in an initial conducting state and interconnecting said second and third alarm fuse contacts in an overload or fault condition.

32. A fused electrical disconnect device as defined in claim 31 wherein said second conductive element includes a current limiting resistor disposed between said line interface and said second alarm fuse contact.

33. A fused electrical disconnect comprising:

a housing comprising a fuse cartridge receptacle, a line side terminal extending from said receptacle and a load side terminal extending from said receptacle; and

a retractable fuse cartridge comprising a body, a line side clip within said body, a load side clip within said body and a load protection fuse extending between said line side and load side clips, said line side terminal and line side clip and said load side terminal and load side clip being in secure biased contact when said fuse cartridge is inserted into said receptacle.

34. A fused electrical disconnect as defined in claim 33 wherein said line side and load side clips are resilient clips engaging outer surfaces of said line side and load side terminals.

35. A fused electrical disconnect device as defined in claim 34 wherein each clip has a pair of curved arms with each arm of said pair curving in an opposite direction, said line side and load side terminals when accommodated between the arms of said clips, separating said arms against a bias resulting in said arms being urged towards one another into secure and intimate contact with said line side and load side terminals.

36. A fused electrical disconnect device as defined in claim 35 wherein each of said line side and load side terminals includes at least one pair of spaced blades, the terminals of said load protection fuse being accommodated between the pairs of spaced blades, said clips contacting outer surfaces of the spaced blades.

37. A fused electrical disconnect as defined in claim 33 further comprises a retainer engaging said load protection fuse to retain said load protection fuse within said body.

38. A fused electrical disconnect as defined in claim 37 wherein said retainer engages a terminal of said load protection fuse.

39. A fused electrical disconnect as defined in claim 38 wherein said line side and load side clips are resilient clips engaging outer surfaces of said line side and load side terminals.

40. A fused electrical disconnect as defined in claim 39 wherein each clip carries a retainer engaging a terminal of said load protection fuse.

41. A fused electrical disconnect as define in claim 33 further comprising an alarm signal circuit in electrical communication with said line side and load side terminals, said alarm signal circuit generating an alarm signal when an electrical current path between said line side and load side terminals is interrupted when said line side and load side terminals are electrically coupled to a power source and load respectively.

42. A fused electrical disconnect device as defined in claim 41 wherein said alarm signal circuit also generates said alarm signal when said cartridge is removed from said receptacle and said line side and load side terminals are electrically coupled to said power source and load respectively.

43. A fused electrical disconnect device as defined in claim 42 wherein said alarm signal circuit includes an alarm fuse in parallel with said load protection fuse, said alarm fuse electrically coupling said line side terminal to an alarm terminal when said load protection fuse fails to complete said electrical current path thereby to generate said alarm signal.

44. A fused electrical disconnect device as defined in claim 43 wherein said load protection fuse has a current rating in the range of from about 70 to 1200 amps.

45. A fused electrical disconnect device as defined in claim 44 wherein said alarm signal circuit includes a first conductive element extending between said load side terminal and a first alarm fuse contact, a second conductive element extending between said line side terminal and a second alarm fuse contact, and a third conductive element extending between said alarm terminal and a third alarm fuse contact, said alarm fuse engaging said first, second and third alarm fuse contacts and interconnecting said first and second alarm fuse contacts in an initial conducting state and interconnecting said second and third alarm fuse contacts in an overload or fault condition.

46. A fused electrical disconnect device as defined in claim 45 wherein said second conductive element includes a current limiting resistor disposed between said line side terminal and said second alarm fuse contact.