GB1300870A – Improvements in or relating to electrical safety barriers
– Google Patents
GB1300870A – Improvements in or relating to electrical safety barriers
– Google Patents
Improvements in or relating to electrical safety barriers
Info
Publication number
GB1300870A
GB1300870A
GB24472/70A
GB2447270A
GB1300870A
GB 1300870 A
GB1300870 A
GB 1300870A
GB 24472/70 A
GB24472/70 A
GB 24472/70A
GB 2447270 A
GB2447270 A
GB 2447270A
GB 1300870 A
GB1300870 A
GB 1300870A
Authority
GB
United Kingdom
Prior art keywords
fuse
diode
terminals
circuitry
box
Prior art date
1969-06-02
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
Application number
GB24472/70A
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.)
Sybron Transition Corp
Original Assignee
Sybron 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.)
1969-06-02
Filing date
1970-05-20
Publication date
1972-12-20
1970-05-20
Application filed by Sybron Corp
filed
Critical
Sybron Corp
1972-12-20
Publication of GB1300870A
publication
Critical
patent/GB1300870A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
H02H9/008—Intrinsically safe circuits
Abstract
1300870 Protective arrangements SYBRON CORP 20 May 1970 [2 June 1969] 24472/70 Headings H2H and H2K A device for protecting equipment situated in a hazardous area comprises a box 5 housing current and voltage limiting circuitry and provided with terminals 1, 3, the circuitry being embedded in encapsulating material 6. The load in the hazardous area is connected between terminals 3, 4 and the circuitry comprises a fuse F, resistors R1, R2, R3 and Zener diodes Z1, Z2, the diode Z2 becoming conductive at a voltage slightly less than that for the diode Z1. If the voltage applied between the terminals 1, 2 increases beyond its normal value the diode Z2 conducts and the increased current through the resistors R1, R2 should cause the fuse to blow. If, however, the fuse does not blow the increasing voltage causes the diode Z1 to conduct thereby further increasing the current through the fuse. A liquid epoxy resin is poured into the box and hardens to encapsulate the circuitry. A copper bus-bar G.B. connects the terminals 2, 4 and a plastics cover which engages projections 31, 35 fits over one end of the box.
GB24472/70A
1969-06-02
1970-05-20
Improvements in or relating to electrical safety barriers
Expired
GB1300870A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US82949169A
1969-06-02
1969-06-02
Publications (1)
Publication Number
Publication Date
GB1300870A
true
GB1300870A
(en)
1972-12-20
Family
ID=25254679
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB24472/70A
Expired
GB1300870A
(en)
1969-06-02
1970-05-20
Improvements in or relating to electrical safety barriers
Country Status (3)
Country
Link
US
(1)
US3614539A
(en)
DE
(1)
DE2023624A1
(en)
GB
(1)
GB1300870A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1983000586A1
(en)
*
1981-08-12
1983-02-17
GIRARD, François, Marie
Protection device against over-voltage in an electric distribution network
Families Citing this family (25)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1414625A
(en)
*
1972-02-28
1975-11-19
American Plasticraft Co
Insulation of electrical multiplier assemblies
US3845356A
(en)
*
1972-04-06
1974-10-29
Foxboro Co
Process control system for hazardous areas
US3771024A
(en)
*
1972-09-05
1973-11-06
Plasticraft Co
Multiplier assembly with air and material dielectric barriers
FR2214987B1
(en)
*
1973-01-19
1978-09-29
Honeywell Gmbh
US3950690A
(en)
*
1973-11-19
1976-04-13
Westinghouse Air Brake Company
Fail-safe reference voltage source
US3878434A
(en)
*
1973-12-10
1975-04-15
Leeds & Northrup Co
Power-limiting electrical barrier device
US3946278A
(en)
*
1973-12-19
1976-03-23
Westinghouse Air Brake Company
Fail-safe four leaded zener diode arrangement
DE2724176B2
(en)
*
1977-05-27
1979-06-13
Siemens Ag, 1000 Berlin Und 8000 Muenchen
DC power system
DE3832068A1
(en)
*
1988-09-21
1990-03-22
Stahl R Schaltgeraete Gmbh
EXPLOSION PROTECTED ELECTRICAL SAFETY BARRIERS
FR2652443A1
(en)
*
1989-09-26
1991-03-29
Inst Vzryvozaschischennogo
ANTIDEFLAGRANT ELECTRICAL APPARATUS.
US5119266A
(en)
*
1989-12-29
1992-06-02
Ail Systems, Inc. (Subsidiary Of Eaton Corp.)
Electromagnetic interference filter protection circuit
GB9417235D0
(en)
*
1994-08-26
1994-10-19
Measurement Tech Ltd
Electrical safety barriers
US5710552A
(en)
*
1994-09-30
1998-01-20
Rosemount Inc.
Barrier device
GB2366202A
(en)
*
2000-08-26
2002-03-06
Weatherford Lamb
Explosion proof electrical systems
US7319191B2
(en)
*
2001-11-01
2008-01-15
Thermo Fisher Scientific Inc.
Signal adapter
US7236342B2
(en)
*
2003-07-28
2007-06-26
Rockwell Automation Technologies, Inc.
In-line passive barrier for intrinsically safe communication network
US20060291118A1
(en)
*
2005-06-28
2006-12-28
Topower Computer Industrial Co., Ltd.
Power transmission line equipped with a protection circuit
DE102005042257B4
(en)
*
2005-09-05
2007-10-31
Rag Aktiengesellschaft
WLAN access device for use in gas-prone mine buildings
EP1982397B1
(en)
*
2006-01-24
2019-07-10
Fisher Controls International Llc
Flameproof apparatus using non-grounded energy-limiting barrier
US20100171506A1
(en)
*
2008-11-26
2010-07-08
James Norgaard
Explosion-proof detector assembly for a flame ionization detector (FID)
DE202010000110U1
(en)
*
2010-02-01
2011-06-01
Bucyrus Europe GmbH, 44534
Intrinsically safe connection unit with network interface, intrinsically safe device and network interface for this
US20110267732A1
(en)
*
2010-05-03
2011-11-03
Samuel Kuo
Circuit protective device
US9778149B2
(en)
2014-05-02
2017-10-03
Swagelok Company
Fluid sample system and method
US10670054B2
(en)
*
2017-10-25
2020-06-02
Dresser, Llc
Constructing valve positioners for hazardous areas
US10749426B1
(en)
*
2019-04-11
2020-08-18
Graco Minnesota Inc.
Trapezoidal power-supply barrier between hazardous and normal locations
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2737579A
(en)
*
1951-04-06
1956-03-06
Acf Ind Inc
Amplifier assembly
US3106665A
(en)
*
1957-12-23
1963-10-08
Motorola Inc
Voltage regulator for vehicular electrical system
US2963577A
(en)
*
1959-08-10
1960-12-06
Motorola Inc
Radio apparatus
US3353068A
(en)
*
1965-12-02
1967-11-14
Vincent K Smith
Control box assembly
1969
1969-06-02
US
US829491A
patent/US3614539A/en
not_active
Expired – Lifetime
1970
1970-05-14
DE
DE19702023624
patent/DE2023624A1/en
active
Pending
1970-05-20
GB
GB24472/70A
patent/GB1300870A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1983000586A1
(en)
*
1981-08-12
1983-02-17
GIRARD, François, Marie
Protection device against over-voltage in an electric distribution network
FR2511556A1
(en)
*
1981-08-12
1983-02-18
Girard Francois
OVERVOLTAGE PROTECTION DEVICE IN AN ELECTRICAL DISTRIBUTION NETWORK
Also Published As
Publication number
Publication date
DE2023624A1
(en)
1970-12-10
US3614539A
(en)
1971-10-19
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Legal Events
Date
Code
Title
Description
1973-05-02
PS
Patent sealed [section 19, patents act 1949]
1982-12-22
PCNP
Patent ceased through non-payment of renewal fee
