US3921109A - Circuit-interrupter - Google Patents

Circuit-interrupter Download PDF

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Publication number
US3921109A
US3921109A US481562A US48156274A US3921109A US 3921109 A US3921109 A US 3921109A US 481562 A US481562 A US 481562A US 48156274 A US48156274 A US 48156274A US 3921109 A US3921109 A US 3921109A
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US
United States
Prior art keywords
contact
operating
reverse
current
movable
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
US481562A
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English (en)
Inventor
Alfred W Hodgson
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.)
CBS Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US481562A priority Critical patent/US3921109A/en
Priority to DE2450424A priority patent/DE2450424C2/de
Priority to GB24607/75A priority patent/GB1505870A/en
Priority to CA229,201A priority patent/CA1036644A/en
Priority to AU82213/75A priority patent/AU502337B2/en
Priority to JP50074604A priority patent/JPS5754884B2/ja
Application granted granted Critical
Publication of US3921109A publication Critical patent/US3921109A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/38—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening

Definitions

  • An improved circuit-interrupter having an improved operating mechanism for operating the separable contacts of the circuit-interrupter unit including a novel reverse-current loop structure enabling the separable contacts to be magnetically closed under higher contact pressure during the existance of highfault conditions, and, on the other hand, when it is desired to open the separable contacts of the improved circuit-interrupter under heavy-fault conditions with the contacts welded closed, the improved operating mechanism, including the reverse-current loop structure, operates in the opposite manner to assist the operating mechanism to open and to separate the separable contacts of the circuit-interrupter.
  • the improved invention additionally contemplates an improved magnetic means associated with the operating mechanism for applying additional contact closing force to hold the contacts closed under additional increased force created magnetically and instantageously at the most appropriate time with the application of the high-fault conditions. Additionally, the same magnetic means is operable, taken in conjunction with the improved operating mechanism of the instant invention, to assist the opening of welded-closed contacts during the opening operation of the circuit-interrutper by a novel relocation of the fulcrum point, which is applicable and which functions in dependence upon either the energization or the non-energization of the operating magnet structure of the operating mechanism for the improved circuit-interrupter of this invention.
  • FIG 14 US. Patent Nov. 18,1975 Sheet11of17 SINGLEACTING REVERSE-CURRENT LOOP PRIQR ART CURRENT FIG. l5 5 -FORCE I LOAD CONNECTION ,L ⁇ I l DOUBLE-ACTING I REVERSE- CURRENT 24
  • FIGZT US. Patent NOV. 18, 1975 Sheet 15 0f 17 CIRCUIT-INTERRUPTER CROSS-REFERENCES To RELATED APPLICATIONS
  • Circuit-interrupters particularly of the vacuum-type are relatively new on the commercial market, and have enjoyed only limited success due to several severe shortcomings.
  • the vacuum-interrupter have found it necessary to use contact materials which are susceptible to welding.
  • the welding problem can be minimized by the use of contact and weldbreaking forces approximately ten times those usually found in a conventional air-break contactor of comparable rating.
  • Vacuum-interrupters having the most desirable interrupting characteristics and longest contact life have been found to weld at currents considerably below their interrupting limit, so that the interrupting rating of a contactor using these vacuumtype circuit-interrupters is limited by the ability of the actuating or operating mechanism to overcome the welding problem, rather than by the arc-interrupting ability of the vacuum-type circuit-interrupter.
  • a three-pole contactor having a magnet and frame assembly proportioned to meet the design requirements of the vacuum-interrupter, and still have a reasonable mechanical life would be much too large and costly to compete with existing air break contactors which require only a fraction of the contact force.
  • existing vacuumtype contactors are a design compromise which do not completely satisfy the requirements of the vacuum interrupter, and as a result do not perform as well as existing available air-break contactors.
  • the high mechanical advantage of this mechanism would, in addition, result in low or diminished contact overtravel, which, in turn, would make frequent adjustment of contact overtravel necessary.
  • Reverse-current loops have been employed in the past to increase the contact-closing forces under heavy fault conditions, but have had the tendency to-override the operating magnet.
  • a reverse-current loop of this type designed to supply the required contact-closing forces of a three-pole vacuum contactor, would exert so much force that the reverse-current loop would hold the contacts and magnet closed even after the magnet is de-energized.
  • a weak reverse-current loop of this type would not hold the contacts closed, but would act to reduce opening speed and weld-breaking forces. which is also undesirable.
  • the contact closing springs, operating magnet and other structure are proportioned to provide the proper contact closing forces sufficient to insure satisfactory performance under motor starting, running, and locked-rotor conditions for the maximum sized motor with which the conta'ctor will be used.
  • the operating mechanism for the separable contacts of the vacuum-type circuit-interrupter is such that a reverse-current loop is employed in conjunction therewith which has two oppositelydirected functions.
  • the fulcrum point of the reverse-current actuating arm is so located that upon a sudden increase of the current magnitude passing through the circuit-interrupter, or stated otherwise, under heavy-fault conditions existing in the controlled circuit, the magnetic forces in the reverse-current loop structure are directed to increase the contact-closing forces, thereby assisting the contact-spring pressure provided by the operating mechanism itself.
  • the de-energization of the operating magnet will be reflected through the disclosed linkage structure to change the location of the fulcrum point of the reverse-current actuating arm to thereby bring about an opposite function or effect of the reverse-current loop structure, or in other words, to redirect the forces created by the reverse-current loop structure, so that at this time the magnetic forces, generated by the reverse-current loop structure, actually assist the operating mechanism to open the separable contacts, and to break any welded condition existing at the contacts themselves.
  • the improved reverse-current loop structure of the present invention has two important functions.
  • the first function is to increase the contact-closing forces, thereby assisting the contact-pressure springs in the closed-circuit position of the circuit-interrupter, when the magnet structure is energized, under the conditions of high-fault current passing through the interrupter.
  • a remote circuit-breaker would be desired to open the circuit rather than the contactor, and the magnet would remain energized as desired.
  • the operating magnet of the contactor depends upon whether or not the fulcrum point of the reverse-current actuating arm changes, and thereby affects the function and operation of the reverse-current loop system.
  • the de-energization of the operating magnet structure will effect automatically a relocation of the fulcrum point of the reversecurrent actuating arm and thereby drastically change the operating function of the reverse-current loop sys- 3 tem to thereby result in an entirely oppositely-directed force, this time a force directed to open the separable contacts and thus to break any welding conditions existing thereat.
  • an abutment member such as a plate, for example, which is associated with the contact-pressure spring
  • a reverse-current loop arm pivotally mounted to the contact-actuating arm has a nose portion bearing on said abutment member or plate, and operable during the de-energized condition of the magnet to act in an opening direction against said abutment plate.
  • the fulcrum point is at the pin 107, as shown in FIG. 20, which is between the pivot shaft 132 and the reverse-current loop 221, 222.
  • the reverse-current loop system of the present invention comprises a metallic conducting arm carrying the line current to the interrupter contacts. and pivotally mounted on the same pivot shaft location at which the rotatable contact operating arm pivotally connects to the movable contact stem of the vacuuminter-rupter.
  • the reverse-current loop arm acts in a manner to break the contact weld by relocating the fulcrum point. of the reverse-current actuating arrn so that it now exists at the pivot point for the rotatable contact arm.
  • the fulcrum point is at pin 107, as shown in FIG. 20.
  • Another very important feature of the present invention is the structure for supplying or feeding series current to the reverse-current loop arm, so that it does not oppose or tend to neutralize the magnetic action of the reverse-current loop arm.
  • This is achieved by a special stationary current-feed circuit, which locates the current-feeding arms in roughly the same plane as the movable portion of the reverse-current loop arm, so
  • the fact, the magnetic effect, generated at the two sationary current-feed arms, is to increase and augment the magnetic effect exerted on the movable portion of the reverse-current loop-arm structure.
  • FIG. 1 is a perspective view of motor-starter equipment including two motor starters disposed in superimposed relation together with their disconnecting-switch structures;
  • FIG. 2 is an enlarged view looking into the interior of a cell-structure adaptable for accommodating the improved roll-in vacuum-type circuit-interrupter structure of the instant invention, with the access doors for the low and high-voltage compartments being open;
  • FIG. 3 is a side-elevational view of the right side of the truck-mounted contactor, 'or interrupter assembly of the instant invention
  • FIG. 4 is a side-elevational view of the lefthand side of the truck-mounted vacuum-interrupter assembly of the present invention
  • FIG. 5 is a front elevational view looking at the front of the truck-mounted vacuum-type circuit-interrupter assembly of the present invention
  • FIG. 6 is a vertical sectional view taken substantially along the line VIVI of FIG. 5 with the separable-contact structure closed;
  • FIG. 7 is an enlarged detailed view of the operating linkage and mechanism structure of FIG. 6, again the separable contacts of the vacuum-type circuit-interrupter assembly being illustrated in the closed-circuit position with the operating magnet energized;
  • FIG. 8 is a fragmentary vertical section view taken substantially along line VIIIVIII of FIG. 7, again the contact structure being shown in the closed-circuit position;
  • FIG. 9 is a view similar to that of FIG. 7, but illustrating the separable contacts of the vacuum-interrupter unit in the fully-open ciruit position with the operating magnet de-energized;
  • FIG. 10 is an exploded perspective view of the several parts employed in conjunction with the improved operating mechanism of the instant invention.
  • FIG. 11 is a somewhat diagrammatic view of the component parts of a motor-starter equipment for controlling motor installations with the disconnecting switch shown closed, and also the contactor assembly being shown in the closed-circuit position, the truckmounted elements being illustrated in their in-cell operating condition;
  • FIG. 12 is a top plan view ofthe reverse-current feeder circuit illustrating the structure thereof;
  • FIG. 13 is a side-elevational view of the reverse-current feeder structure of FIG. 12;
  • FIG. 14 is a front elevational view of a component part of the improved reverse-current feeder circuit of FIGS. 12 and 13;
  • FIG. 15 is a diagrammatic view illustrating a singleacting reverse-current loop structure with the contacts (not shown) closed, and electrical current passing through the reverse-current loop structure;
  • FIG. 16 illustrates diagrammatically a double-acting reverse-current loop structure utilizing some of the principles of the present invention, but illustrating a condition of a feeder connection structure, which is not commercially appropriate or desirable, the contact I structure (not shown) being illustrated in the closed circuit position, and again electrical current being illustrated as passing through the double-acting reversecurrent loop;
  • FIG. 17 illustrates diagrammatically the improved relocation of the feeder circuit structure of FIG. 16, in which the double-acting reverse-current loop is adversely magnetically affected by the particular feeder circuit arrangement illustrated in FIG. 17, which is, of course, undesirable;
  • FIG. 18 illustrates diagrammatically the closed-circuit position of the vacuum-type circuit-interrupter of the present invention, illustrating the passage of current through the reverse-current loop, illustrating the location of the pivot point or fulcrum point for the reverse-current loop arm, with the operating magnet energized, and during the existence of high-fault current

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Electromagnets (AREA)
  • Manufacture Of Switches (AREA)
  • Resistance Welding (AREA)
US481562A 1974-06-20 1974-06-20 Circuit-interrupter Expired - Lifetime US3921109A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US481562A US3921109A (en) 1974-06-20 1974-06-20 Circuit-interrupter
DE2450424A DE2450424C2 (de) 1974-06-20 1974-10-23 Elektrische Schaltvorrichtung
GB24607/75A GB1505870A (en) 1974-06-20 1975-06-09 Circuit-interrupter
CA229,201A CA1036644A (en) 1974-06-20 1975-06-12 Circuit-interrupter
AU82213/75A AU502337B2 (en) 1974-06-20 1975-06-18 Switching device
JP50074604A JPS5754884B2 (ja) 1974-06-20 1975-06-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US481562A US3921109A (en) 1974-06-20 1974-06-20 Circuit-interrupter

Publications (1)

Publication Number Publication Date
US3921109A true US3921109A (en) 1975-11-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
US481562A Expired - Lifetime US3921109A (en) 1974-06-20 1974-06-20 Circuit-interrupter

Country Status (6)

Country Link
US (1) US3921109A (ja)
JP (1) JPS5754884B2 (ja)
AU (1) AU502337B2 (ja)
CA (1) CA1036644A (ja)
DE (1) DE2450424C2 (ja)
GB (1) GB1505870A (ja)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038626A (en) * 1975-06-11 1977-07-26 I-T-E Imperial Corporation High voltage contactor
US4104496A (en) * 1977-01-18 1978-08-01 Tokyo Shibaura Electric Co., Ltd. Vacuum interrupter device
US4247745A (en) * 1978-09-13 1981-01-27 Westinghouse Electric Corp. Vacuum-type contactor assembly
US4473860A (en) * 1981-11-09 1984-09-25 La Telemecanique Electrique Contactor apparatus comprising automatic opening means and a local control member
US4495538A (en) * 1981-11-09 1985-01-22 La Telemecanique Electrique Contactor apparatus comprising means for automatically opening power circuits and a local control device
US4513267A (en) * 1983-03-28 1985-04-23 Siemens-Allis, Inc. Stationary contact strap to achieve a current limiting blow-off effect
US4891841A (en) * 1988-02-22 1990-01-02 Rane Corporation Reciprocal, subtractive, audio spectrum equalizer
US5189384A (en) * 1991-11-06 1993-02-23 Westinghouse Electric Corp. Circuit breaker having improved contact structure
US5196815A (en) * 1992-01-31 1993-03-23 Westinghouse Electric Corp. Miniature circuit breaker
WO1993020571A1 (de) * 1992-03-27 1993-10-14 Siemens Aktiengesellschaft Vakuumschalter mit einer stromschleifenanordnung
WO1997027602A1 (de) * 1996-01-22 1997-07-31 Siemens Aktiengesellschaft Elektrisches schaltgerät
US5767451A (en) * 1994-05-30 1998-06-16 Siemens Aktiengesellschaft Insulating support for vacuum switch tubes
US5886860A (en) * 1997-08-25 1999-03-23 Square D Company Circuit breakers with PTC (Positive Temperature Coefficient resistivity
US5898148A (en) * 1997-01-11 1999-04-27 Klockner Moeller Gmbh Coil shaped terminal for an electrodynamically operated circuit breaker
FR2783362A1 (fr) * 1998-09-15 2000-03-17 Soule Materiel Electr Ensemble de gestion de reseaux electriques comportant des moyens de connexion perfectionnes
US6066814A (en) * 1999-02-18 2000-05-23 Eaton Corporation Interlock for switchgear
US20040173577A1 (en) * 2003-03-07 2004-09-09 Abb Service S.R.L Low-voltage circuit-breaker and corresponding positive-opening-operation device
CN101465244B (zh) * 2007-12-17 2011-05-04 宁波市华安电力电气股份有限公司 纵向断路器
CN102737905A (zh) * 2012-06-15 2012-10-17 田利民 具备永磁和弹簧机构特性的真空断路器自适应操动机构
US20160211088A1 (en) * 2013-12-26 2016-07-21 Mitsubishi Electric Corporation Bypass switch
US20180138002A1 (en) * 2015-05-11 2018-05-17 General Electric Technology Gmbh Improvements in or relating to voltage source converters
CN109216054A (zh) * 2018-10-24 2019-01-15 首瑞（天津）电气设备有限公司 一种电器组件
CN113506432A (zh) * 2021-07-07 2021-10-15 安徽理工大学 一种大型服务器电力故障报警器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57109115A (en) * 1980-12-26 1982-07-07 Sony Corp Peak shift display device
DE3111792A1 (de) * 1981-03-20 1982-09-30 Siemens AG, 1000 Berlin und 8000 München Lasttrennschalter mit einer antriebsvorrichtung zur sprungartigen ein- und ausschaltung
JPS63132534A (ja) * 1986-11-22 1988-06-04 Anritsu Corp ２ル−トの伝搬遅延時間差測定装置
DE8905949U1 (ja) * 1989-05-11 1990-09-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE4210716A1 (de) * 1992-03-27 1993-09-30 Siemens Ag Mehrpoliger Vakuumschalter mit einer jede Vakuumröhre umgebenden Isolieranordnung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3550049A (en) * 1968-07-05 1970-12-22 Merlin Gerin Current limiting circuit breaker with electrodynamic compensation
US3593227A (en) * 1968-02-28 1971-07-13 Gennady Fedosievich Mitskevich Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members
US3663906A (en) * 1969-10-09 1972-05-16 Gen Electric Electric circuit breaker with magnetically assisted closing means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282776B (de) * 1960-09-08 1968-11-14 Siemens Ag Elektrischer Schalter
GB1053936A (ja) * 1964-08-01

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593227A (en) * 1968-02-28 1971-07-13 Gennady Fedosievich Mitskevich Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members
US3550049A (en) * 1968-07-05 1970-12-22 Merlin Gerin Current limiting circuit breaker with electrodynamic compensation
US3663906A (en) * 1969-10-09 1972-05-16 Gen Electric Electric circuit breaker with magnetically assisted closing means

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038626A (en) * 1975-06-11 1977-07-26 I-T-E Imperial Corporation High voltage contactor
US4104496A (en) * 1977-01-18 1978-08-01 Tokyo Shibaura Electric Co., Ltd. Vacuum interrupter device
US4247745A (en) * 1978-09-13 1981-01-27 Westinghouse Electric Corp. Vacuum-type contactor assembly
US4473860A (en) * 1981-11-09 1984-09-25 La Telemecanique Electrique Contactor apparatus comprising automatic opening means and a local control member
US4495538A (en) * 1981-11-09 1985-01-22 La Telemecanique Electrique Contactor apparatus comprising means for automatically opening power circuits and a local control device
US4513267A (en) * 1983-03-28 1985-04-23 Siemens-Allis, Inc. Stationary contact strap to achieve a current limiting blow-off effect
US4891841A (en) * 1988-02-22 1990-01-02 Rane Corporation Reciprocal, subtractive, audio spectrum equalizer
US5189384A (en) * 1991-11-06 1993-02-23 Westinghouse Electric Corp. Circuit breaker having improved contact structure
US5196815A (en) * 1992-01-31 1993-03-23 Westinghouse Electric Corp. Miniature circuit breaker
WO1993020571A1 (de) * 1992-03-27 1993-10-14 Siemens Aktiengesellschaft Vakuumschalter mit einer stromschleifenanordnung
US5528009A (en) * 1992-03-27 1996-06-18 Siemens Aktiengesellschaft Vacuum switch with a current-loop assembly
US5767451A (en) * 1994-05-30 1998-06-16 Siemens Aktiengesellschaft Insulating support for vacuum switch tubes
WO1997027602A1 (de) * 1996-01-22 1997-07-31 Siemens Aktiengesellschaft Elektrisches schaltgerät
US5986528A (en) * 1996-01-22 1999-11-16 Siemens Aktiengesellschaft Electrical switching device
CN1063868C (zh) * 1996-01-22 2001-03-28 西门子公司 电开关装置
US5898148A (en) * 1997-01-11 1999-04-27 Klockner Moeller Gmbh Coil shaped terminal for an electrodynamically operated circuit breaker
US5886860A (en) * 1997-08-25 1999-03-23 Square D Company Circuit breakers with PTC (Positive Temperature Coefficient resistivity
FR2783362A1 (fr) * 1998-09-15 2000-03-17 Soule Materiel Electr Ensemble de gestion de reseaux electriques comportant des moyens de connexion perfectionnes
EP0987794A1 (fr) * 1998-09-15 2000-03-22 Soule Materiel Electrique Ensemble de gestion de réseaux électriques comportant des moyens de connexion perfectionnés
US6066814A (en) * 1999-02-18 2000-05-23 Eaton Corporation Interlock for switchgear
US20040173577A1 (en) * 2003-03-07 2004-09-09 Abb Service S.R.L Low-voltage circuit-breaker and corresponding positive-opening-operation device
US7045733B2 (en) * 2003-03-07 2006-05-16 Abb Service S.R.L. Low-voltage circuit-breaker and corresponding positive-opening-operation device
CN101465244B (zh) * 2007-12-17 2011-05-04 宁波市华安电力电气股份有限公司 纵向断路器
CN102737905B (zh) * 2012-06-15 2014-11-05 新疆新华能电气股份有限公司 具备永磁和弹簧机构特性的真空断路器自适应操动机构
CN102737905A (zh) * 2012-06-15 2012-10-17 田利民 具备永磁和弹簧机构特性的真空断路器自适应操动机构
US20160211088A1 (en) * 2013-12-26 2016-07-21 Mitsubishi Electric Corporation Bypass switch
US9530579B2 (en) * 2013-12-26 2016-12-27 Mitsubishi Electric Corporation Bypass switch
US20180138002A1 (en) * 2015-05-11 2018-05-17 General Electric Technology Gmbh Improvements in or relating to voltage source converters
US10504676B2 (en) * 2015-05-11 2019-12-10 General Electric Technology Gmbh Voltage source converters
CN109216054A (zh) * 2018-10-24 2019-01-15 首瑞（天津）电气设备有限公司 一种电器组件
CN113506432A (zh) * 2021-07-07 2021-10-15 安徽理工大学 一种大型服务器电力故障报警器
CN113506432B (zh) * 2021-07-07 2023-03-28 安徽理工大学 一种大型服务器电力故障报警器

Also Published As

Publication number Publication date
JPS5132962A (ja) 1976-03-19
CA1036644A (en) 1978-08-15
GB1505870A (en) 1978-03-30
DE2450424A1 (de) 1976-03-18
AU8221375A (en) 1976-12-23
AU502337B2 (en) 1979-07-19
JPS5754884B2 (ja) 1982-11-20
DE2450424C2 (de) 1985-08-22

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