US3876948A - Fuse alarm indicator - Google Patents

Fuse alarm indicator Download PDF

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Publication number
US3876948A
US3876948A US434358A US43435874A US3876948A US 3876948 A US3876948 A US 3876948A US 434358 A US434358 A US 434358A US 43435874 A US43435874 A US 43435874A US 3876948 A US3876948 A US 3876948A
Authority
US
United States
Prior art keywords
indicator
carrier
pair
cartridge
firing pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US434358A
Other languages
English (en)
Inventor
Marianne Blumenthal
Joachim Choschzick
Gunter Glimm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3876948A publication Critical patent/US3876948A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements
    • H01H85/306—Movable indicating elements acting on an auxiliary switch or contact

Definitions

  • It comprises a carrier of insulating material which includes a cross piece having an opening which is coaxial with the firing pin of a priming cartridge and the plunger of a control-current switch which opening guides the axial movement of the firing pin to effect axial movement of the plunger to thereby cause a change in the condition of the switch and the control circuit in which it is connected.
  • Field of the Invention concerns a fuse alarm indicator and particularly one in which a priming cartridge and a controlcurrent switch operated by the priming cartridge are mounted in a carrierseparate from the fuse to be mounted.
  • a socalled priming cartridge or actuator fuse which is connected in parallel with the fuse to be monitored and which has a lower current rating than the main fuse. It includes a spring-loaded firing pin embedded in a quenching medium. The pin is released when-the main fuse blows due to the diversion of current from the main line through the actuator fuse.
  • a control-current switch e.g., a microswitch
  • a control-current switch is positioned in suitable relationship to the actuator fuse so that the movement of the pin is utilized by the control switch for effecting suitable switching action thereof.
  • the fuse'alarm indicator is arranged separate from the fuse to be monitored on a carrier of insulating materiaL'This is done so that several priming cartridges can act on a common control switch by means of a movable, insulating intermediate member.
  • This construction has the advantage that it can be arranged physically separate from the fuses to be monitored. Further, it allows for monitoring of several fuses having different response characteristics.
  • a primary object of this invention is to provide a fuse alarm indicator which is separate from the main fuse to be monitored and which does not require an intermediate member between the priming cartridge and the control switch to effect the necessary cooperation between the two.
  • This cross piece includes an opening which is coaxial with the center line of the firing pin of the priming cartridge. Further, the cross piece includes a pair of mounting tabs for securing a suitable control switch such that the switch actuating plunger is positioned in a way that its axis is coaxial with the centerline of the opening and the firing pin.
  • the firing pin and actuating plunger are positioned in sufficient proximity that movement of the firing pin, in response to a blown main fuse causes movement of the actuating plunger effecting a changed condition in the switch and the contral circuit of which the latter forms a part.
  • the carrier base 1 includes a projection 15 and a screw mounting hole 14, each of which correspond positionally to a recess l6 and suitable screw hole 21, respectively, in mounting plate 20. This allows for secure mounting of the alarm indicator with the use of a single screw.
  • carrier base 1 includes mounting pads 22 and 24. Secured to each of these in a known fashion is a suitable contact clip terminal lug unit l0-ll.
  • the contact clip 10 and the terminal lu'g 11 are electrically integral.
  • the contact clips 10 are structured such that they provide suitableclearance between a priming cartridge 4 when placed in position in the contact clips 10 and a pair of electrical wires 12 which connect the alarm indicator of this invention to respective sides'of the main fuse to be monitored.
  • These electrical wires 12 are secured to the terminal lugs II by any suitable fashion, one of which is the screw-nut arrangement depicted in FIGS. 1 and 2.
  • the carrier further includes a U-shaped channel portion defined by side walls2 which are preferably perpendicular to the base section 1 and which extend out beyond the contact clip 10. This makes the priming cartridge 4 accessible only from the right or the alarm indicator as viewed in FIG. 2 and provides necessary protection to personnel who must service these indicators particularly where high voltages are involved.
  • the cross piece 3 includes an opening 6, therethrough, which is coaxially aligned with the longitudinal axis of the priming cartridge 4.
  • the priming cartridge 4 is of a known variety and includes a spring loaded firing pin 7 extending from the end of the cartridge closest to opening 6.
  • a pair of mounting tabs 26 and 28 Extending upward and away from the U-shaped channel are a pair of mounting tabs 26 and 28. Secured between these mounting tabs is a suitable current control switch mechanism 5, which preferably may be a microswitch, which includes an actuating plunger 8 for interrupting or changing the switch condition of mechanism 5.
  • the control switch 5 is secured to the mounting tabs by rivets 9 and positioned between said mounting tabs 26 and 28 such that the actuating plunger 8 is axially aligned with the opening 6 of cross piece 3.
  • the actuating plunger penetrates the opening 6 of cross piece 3 with the extreme end thereof lying in close proximity to the extreme end of firing pin 7.
  • Protruding from the control current switch 5 are suitable terminals for connection to electrical wires 13. These latter wires are connected to a suitable control circuit which gives an indication of the main fuse condition in response to the switch position of the current control switch 5.
  • control switch 5 and priming cartridge 4 By providing only one control switch 5 and priming cartridge 4 in but one carrier, wider latitude is allowed in .locating particular fuse alarm indicators. They may be grouped in any number side-by-side or alternately, where space limitations exist, they may be used singly.
  • the use of the insulating walls 2, extending up from the carrier base. give necessary protection to personnel operating in the area by eliminating other than intended contact with the priming cartridge and particularly the voltages appearing on electrical lines 12.
  • An alarm indicator for detecting the condition of 5 an electrical fuse which comprises:
  • carrier means made of electrical insulating material, said carrier means including i. a carrier base, including mounting pads positioned thereon,
  • a priming cartridge including a firing pin, positioned in said contact clips such that the longitudinal axis of said cartridge and said firing pin is coaxial with the longitudinal axis of said longitudinal opening;
  • control switch means including an actuating plunger, secured to said carrier by said mechanical mounting means, said actuating plunger positioned in said longitudinal opening such that the plunger responds to axial movement of said firing pin to effect a change in the switch condition of said control switch means, said control switch means further including a pair of control electrical lines for detecting said switch condition.
  • said carrier means further includes a pair of side walls extending from said carrier base outward beyond said priming 40 cartridge positioned in said contact clips, said pair of side walls thereby forming a U-shaped channel with said carrier base.

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  • Fuses (AREA)
US434358A 1973-01-26 1974-01-17 Fuse alarm indicator Expired - Lifetime US3876948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7302964U DE7302964U (de) 1973-01-26 1973-01-26 Sicherungsmelder

Publications (1)

Publication Number Publication Date
US3876948A true US3876948A (en) 1975-04-08

Family

ID=6636466

Family Applications (1)

Application Number Title Priority Date Filing Date
US434358A Expired - Lifetime US3876948A (en) 1973-01-26 1974-01-17 Fuse alarm indicator

Country Status (12)

Country Link
US (1) US3876948A (en(2012))
AT (1) AT326750B (en(2012))
AU (1) AU6467074A (en(2012))
BE (1) BE809971A (en(2012))
CH (1) CH564845A5 (en(2012))
DE (1) DE7302964U (en(2012))
FR (1) FR2215697B3 (en(2012))
GB (1) GB1412723A (en(2012))
IT (1) IT1007009B (en(2012))
LU (1) LU69235A1 (en(2012))
NL (1) NL7400241A (en(2012))
ZA (1) ZA74312B (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150287564A1 (en) * 2014-04-04 2015-10-08 Eaton Corporation Remote Fuse Operation Indicator Assemblies and Related Systems and Methods
CN112331522A (zh) * 2020-11-16 2021-02-05 安徽理工大学 非接触爆炸式开关
US20220270841A1 (en) * 2019-08-29 2022-08-25 Hitachi Energy Switzerland Ag Electrical assembly comprising blown fuse indication system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737615B1 (fr) * 1995-08-03 1997-09-12 Spie Enertrans Dispositif de protection d'une installation electrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2405929A (en) * 1943-06-09 1946-08-13 Bendix Aviat Corp Electrical apparatus
US2581305A (en) * 1943-09-15 1952-01-01 Bell Telephone Labor Inc Detection of electrically charged particles
US3274358A (en) * 1966-09-20 Indicator light having a pivotally-connected light housing block and a lens cover section slidably mounted thereon
US3593247A (en) * 1969-04-24 1971-07-13 Westinghouse Electric Corp Trigger fuse switch assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274358A (en) * 1966-09-20 Indicator light having a pivotally-connected light housing block and a lens cover section slidably mounted thereon
US2405929A (en) * 1943-06-09 1946-08-13 Bendix Aviat Corp Electrical apparatus
US2581305A (en) * 1943-09-15 1952-01-01 Bell Telephone Labor Inc Detection of electrically charged particles
US3593247A (en) * 1969-04-24 1971-07-13 Westinghouse Electric Corp Trigger fuse switch assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150287564A1 (en) * 2014-04-04 2015-10-08 Eaton Corporation Remote Fuse Operation Indicator Assemblies and Related Systems and Methods
US9583297B2 (en) * 2014-04-04 2017-02-28 Eaton Corporation Remote fuse operation indicator assemblies and related systems and methods
US10283310B2 (en) 2014-04-04 2019-05-07 Eaton Intelligent Power Limited Remote fuse operation indicator assemblies and related systems and methods
US20220270841A1 (en) * 2019-08-29 2022-08-25 Hitachi Energy Switzerland Ag Electrical assembly comprising blown fuse indication system
US11587756B2 (en) * 2019-08-29 2023-02-21 Hitachi Energy Switzerland Ag Electrical assembly comprising blown fuse indication system
CN112331522A (zh) * 2020-11-16 2021-02-05 安徽理工大学 非接触爆炸式开关

Also Published As

Publication number Publication date
LU69235A1 (en(2012)) 1974-04-10
AT326750B (de) 1975-12-29
IT1007009B (it) 1976-10-30
NL7400241A (en(2012)) 1974-07-30
DE7302964U (de) 1973-09-06
GB1412723A (en) 1975-11-05
BE809971A (fr) 1974-05-16
ZA74312B (en) 1974-11-27
AU6467074A (en) 1975-07-24
CH564845A5 (en(2012)) 1975-07-31
FR2215697A1 (en(2012)) 1974-08-23
ATA1039373A (de) 1975-03-15
FR2215697B3 (en(2012)) 1976-10-22

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