CA1058739A - Portable ground fault circuit interrupter - Google Patents
Portable ground fault circuit interrupterInfo
- Publication number
- CA1058739A CA1058739A CA230,013A CA230013A CA1058739A CA 1058739 A CA1058739 A CA 1058739A CA 230013 A CA230013 A CA 230013A CA 1058739 A CA1058739 A CA 1058739A
- Authority
- CA
- Canada
- Prior art keywords
- ground fault
- coil
- switch
- armature
- power circuit
- 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
Links
- 239000004020 conductor Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 239000002674 ointment Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000000881 depressing effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
- H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Breakers (AREA)
Abstract
PORTABLE GROUND FAULT CIRCUIT INTERRUPTER
Abstract of the Disclosure A ground fault circuit interrupter which utilizes one trip coil to perform the combined functions of interrupting a circuit on occurrence of a ground fault as well as an under voltage condition. An electronic module supplies continuous current to the trip coil until a ground fault or under voltage condition occurs. The armature is spring biased in a direction away from the trip coil, with tension of the spring adjusted to pull the armature away from the trip coil when voltage in the coil decreases below a selected amplitude.
Abstract of the Disclosure A ground fault circuit interrupter which utilizes one trip coil to perform the combined functions of interrupting a circuit on occurrence of a ground fault as well as an under voltage condition. An electronic module supplies continuous current to the trip coil until a ground fault or under voltage condition occurs. The armature is spring biased in a direction away from the trip coil, with tension of the spring adjusted to pull the armature away from the trip coil when voltage in the coil decreases below a selected amplitude.
Description
Background o~ the Invention In order to comply with certai~ industry standards and safety provisions, ground fault interrupters often include an under voltage relay. Prior devices have included two trip coils, one to interrupt the circuit on occurrence of a ground rault and the other to do so on occurrence of an under voltage condit~on.
This invention enables one trip coil to perform both functions thus reducing cost and the space required for an ~ ~ -extra coil.
According to one aspect of the present invention~ a ground fault power circuit interrupter ~or use in a power cir cuit having ground fault sensing means for sensing the occur-rence of a ground fault above a preselected magnitude, compris-es a single magnetic core and coil, armature means operatively associated with and normally attracted to sald magnetic core ln response to energization of sald coil by a current above a predetermined value, power clrcuit contact means including a movable carrier member carrying a contact and controlled by said armature means ror extending said power clrcuit through said contact ln response to ~he energl~ion of said coil by said current above said predetermined value, mechanical biasing means to bias said armature ~rom said magnetic core and movlng said carrier member and contact to interrupt sald power circuit in respon~e to the current in sald magnetic coil falling below said predetermined Yalue~ control circuit means including rectifier supply means connected to sald power circuit, first ~-switch means ln said control circuit in a normally conducting state when said co~trol circuit is powered by sald rectifier supply means for energizlng said coil, a second switch con-trolled in response to the sensing of a ground ~ault above -1- ~ .. ' "
~',.' .~ .
~.. , 1 0S~373~
said preselected magnltude, threshold switch actuating means having lnternal circuit responsive variable resistance characteristics for controlllng said first switch means to render said first switch means non-conducting and thereby interrupt current in sald coil in response to the control of said second switch by said ground fault current above said preselected magnitude, said armature, carrier and contact moved by said biasing means ~n response to said coil being energized by a current below said predeterm~ned value'for interrupting said power circuit, a first conductor e~ndlng between sald ~.
rectifier supply means and said second switch mean~, a second conductor connected at one end to said first conductor at a r~
~unction point thereon between said rectifier supply means and said second switch means and at the other end to sald first switch means, sald threshold switch actuating .means being connected in series ln said second conductor between said ~unction point and said first switch means, and a manually movable reset member engaged with said carrier for moving sald carrier and contact against sa~d blas to move said armature toward said core for enabling said armature to control said contact ~or extending said power circult in response to the current ln sald power circult being above sald predetermined :
value and moved by sald carr~er in response to said coil being .;. . :.: .
energized by a current below said predetermined value. ; :
The inventlon will be more clearly understood after i,: .
re~erence to the following detailed speci~ication read in .:
con~unctlon with the drawings wherein:
Fig. 1 is a side elevation view of a ground fault circuit interrupter in accordance withthis invention, wlth oertain parts in section and others broken away, showin~
i . .
; :.
This invention enables one trip coil to perform both functions thus reducing cost and the space required for an ~ ~ -extra coil.
According to one aspect of the present invention~ a ground fault power circuit interrupter ~or use in a power cir cuit having ground fault sensing means for sensing the occur-rence of a ground fault above a preselected magnitude, compris-es a single magnetic core and coil, armature means operatively associated with and normally attracted to sald magnetic core ln response to energization of sald coil by a current above a predetermined value, power clrcuit contact means including a movable carrier member carrying a contact and controlled by said armature means ror extending said power clrcuit through said contact ln response to ~he energl~ion of said coil by said current above said predetermined value, mechanical biasing means to bias said armature ~rom said magnetic core and movlng said carrier member and contact to interrupt sald power circuit in respon~e to the current in sald magnetic coil falling below said predetermined Yalue~ control circuit means including rectifier supply means connected to sald power circuit, first ~-switch means ln said control circuit in a normally conducting state when said co~trol circuit is powered by sald rectifier supply means for energizlng said coil, a second switch con-trolled in response to the sensing of a ground ~ault above -1- ~ .. ' "
~',.' .~ .
~.. , 1 0S~373~
said preselected magnltude, threshold switch actuating means having lnternal circuit responsive variable resistance characteristics for controlllng said first switch means to render said first switch means non-conducting and thereby interrupt current in sald coil in response to the control of said second switch by said ground fault current above said preselected magnitude, said armature, carrier and contact moved by said biasing means ~n response to said coil being energized by a current below said predeterm~ned value'for interrupting said power circuit, a first conductor e~ndlng between sald ~.
rectifier supply means and said second switch mean~, a second conductor connected at one end to said first conductor at a r~
~unction point thereon between said rectifier supply means and said second switch means and at the other end to sald first switch means, sald threshold switch actuating .means being connected in series ln said second conductor between said ~unction point and said first switch means, and a manually movable reset member engaged with said carrier for moving sald carrier and contact against sa~d blas to move said armature toward said core for enabling said armature to control said contact ~or extending said power circult in response to the current ln sald power circult being above sald predetermined :
value and moved by sald carr~er in response to said coil being .;. . :.: .
energized by a current below said predetermined value. ; :
The inventlon will be more clearly understood after i,: .
re~erence to the following detailed speci~ication read in .:
con~unctlon with the drawings wherein:
Fig. 1 is a side elevation view of a ground fault circuit interrupter in accordance withthis invention, wlth oertain parts in section and others broken away, showin~
i . .
; :.
-2- ~ - . :
.~
~'~4 )'''' .' "
" '~ ' ~Lo58739 the contacts in clo~ed position;
Flg. 2 is a side elevation view of the device of Fig.
1 showing the contacts in open position;
Fig. 3 is an end elevation of a main spring and arm~
ature bias spring taken on line 3-3 of Fig. l; , and Fig. 4 is a schematic drawing illustratlng a clrcuit and components for use in the ground fault interrupter o~
this invention.
A ground fault circuit lnterrupter in accord with this invention includes trip coil 1 wound on magnetic core ~ :
having a pro~ecting pole face 3. The coil ls mounted on frame 4 with pole face 3 in position to attract armature 5 which is mounted to rotate on armature pivot 6 between a posi-tion in contact with and out of contact with pole race 5.
Bias coil spring 7 is mounted on lateral shaft 8, with movable spring end 9 secured to armature 5 and retained spring end 10 abutting the coil-facing side 11 o~ spring retaining ledge 12.
Bias coil spring 7 thus provides a bias to urge armature 5 away ~rom pole race 3.
Main coil ~pring 13 ls also mounted on lateral sha~t 8, having retained end 14 abutking the contact-raalng side 15 of spring retaining ledge 12 and having a center span 16 ~ positioned to cradle contact carrler member 17 between .l lever arms 18 with cross arm 19 seating in lateral groove 20 o~ carrier member 17. Main coil spring 13 thus pro-vides a bias to urge khe body 21 o~ carrier member 17 against contact pivot 22 thereby moving carrier contact 23 away ~rom stationary contact 24 to open the circuit .~,, , ' . -3-.- ~ .
lOS8739 1 ~ protecte y the ground fault interrupter 2 ~ Contact 23 and 24 open and close a power circuit protected
.~
~'~4 )'''' .' "
" '~ ' ~Lo58739 the contacts in clo~ed position;
Flg. 2 is a side elevation view of the device of Fig.
1 showing the contacts in open position;
Fig. 3 is an end elevation of a main spring and arm~
ature bias spring taken on line 3-3 of Fig. l; , and Fig. 4 is a schematic drawing illustratlng a clrcuit and components for use in the ground fault interrupter o~
this invention.
A ground fault circuit lnterrupter in accord with this invention includes trip coil 1 wound on magnetic core ~ :
having a pro~ecting pole face 3. The coil ls mounted on frame 4 with pole face 3 in position to attract armature 5 which is mounted to rotate on armature pivot 6 between a posi-tion in contact with and out of contact with pole race 5.
Bias coil spring 7 is mounted on lateral shaft 8, with movable spring end 9 secured to armature 5 and retained spring end 10 abutting the coil-facing side 11 o~ spring retaining ledge 12.
Bias coil spring 7 thus provides a bias to urge armature 5 away ~rom pole race 3.
Main coil ~pring 13 ls also mounted on lateral sha~t 8, having retained end 14 abutking the contact-raalng side 15 of spring retaining ledge 12 and having a center span 16 ~ positioned to cradle contact carrler member 17 between .l lever arms 18 with cross arm 19 seating in lateral groove 20 o~ carrier member 17. Main coil spring 13 thus pro-vides a bias to urge khe body 21 o~ carrier member 17 against contact pivot 22 thereby moving carrier contact 23 away ~rom stationary contact 24 to open the circuit .~,, , ' . -3-.- ~ .
lOS8739 1 ~ protecte y the ground fault interrupter 2 ~ Contact 23 and 24 open and close a power circuit protected
3 ll by the interrupter. i 4I Carrier member 17 includes a transverse lip 25 projecting 5li rearward therefrom for engagement with forwardly extending .
6 il armature flange 26 when armature 5 is in contact with pole. ~ace 7 il 3 during normal operating energization of coil 1. Reset button 81~ 27 is depressable manually to bear against a portion of carrier i, . 9'1 body 21 oppositely of and slightly forward of lateral groove 20 101~ in which cross arm 19 of main spring I3 seats to apply a bias opposing the thrust of reset button 27 against.carrier body 21.
12 il When reset button 27 is manually depressed to bear against 13l carrier body 21, carrier member 17 moves against the tension .14~ of main spring 13 from a contact open position to a contact 15~ closed posi~lon whereupon transverse lip 25 projecting rearward 1, .
16j from carrier 17 i.s engaged by armature fl.ange 26 to l.ock carrier 17 ~! member 17 in~contact closed position. The contacts 23 and 24 are 18-i held together;in;closed position until the voltage on coil 1 1 19 , drops below a pre-selected amplitudej enabling bias coil spring 20 i 7 to overcome the magnetlc attractlon force of pole ~ace 3 and :
21,1 urge armature 5 away from contact therewith, ~s armature 5 is . 22~ urged away from pole ~ace 3 it rotates on pivot 6 causing 23'i~ armature flange 26 to disengage from transverse lip 25 of 24~ carrier member 17. The biasing cross arm 19 of maln spring 13 251 is thereupon free to move carrier member 17 in the direction 26 ll which causes carrier 17 to engage contact pivot 22 causing 27, . carrier member 17 to pivot to a contact open position, se~arating 28'l carrier contact 23 from stationary contact 24. The protected 29 circuit is thereby interrupted as a result of the said drop in 30. voltage on~trip coil 1 below a pre-selected amplitude, which 31j occurs on appearance of a ground fault or an under voltage 32~¦ condition in the protected circui.t.
~ ! ~
:, I 1," I',"j ~, I 1~58739 . `
I . . ., , . .
1¦Fig. 4 illustrat.es schematically a control circuit which 2 causes a drop in voltage to occur in trip coil 1 on appearance of a ground ~ault or under voltage condition. A dif~erential ~.
6 il armature flange 26 when armature 5 is in contact with pole. ~ace 7 il 3 during normal operating energization of coil 1. Reset button 81~ 27 is depressable manually to bear against a portion of carrier i, . 9'1 body 21 oppositely of and slightly forward of lateral groove 20 101~ in which cross arm 19 of main spring I3 seats to apply a bias opposing the thrust of reset button 27 against.carrier body 21.
12 il When reset button 27 is manually depressed to bear against 13l carrier body 21, carrier member 17 moves against the tension .14~ of main spring 13 from a contact open position to a contact 15~ closed posi~lon whereupon transverse lip 25 projecting rearward 1, .
16j from carrier 17 i.s engaged by armature fl.ange 26 to l.ock carrier 17 ~! member 17 in~contact closed position. The contacts 23 and 24 are 18-i held together;in;closed position until the voltage on coil 1 1 19 , drops below a pre-selected amplitudej enabling bias coil spring 20 i 7 to overcome the magnetlc attractlon force of pole ~ace 3 and :
21,1 urge armature 5 away from contact therewith, ~s armature 5 is . 22~ urged away from pole ~ace 3 it rotates on pivot 6 causing 23'i~ armature flange 26 to disengage from transverse lip 25 of 24~ carrier member 17. The biasing cross arm 19 of maln spring 13 251 is thereupon free to move carrier member 17 in the direction 26 ll which causes carrier 17 to engage contact pivot 22 causing 27, . carrier member 17 to pivot to a contact open position, se~arating 28'l carrier contact 23 from stationary contact 24. The protected 29 circuit is thereby interrupted as a result of the said drop in 30. voltage on~trip coil 1 below a pre-selected amplitude, which 31j occurs on appearance of a ground fault or an under voltage 32~¦ condition in the protected circui.t.
~ ! ~
:, I 1," I',"j ~, I 1~58739 . `
I . . ., , . .
1¦Fig. 4 illustrat.es schematically a control circuit which 2 causes a drop in voltage to occur in trip coil 1 on appearance of a ground ~ault or under voltage condition. A dif~erential ~.
4 transformer 28 encompasses power lines ~1 and L2 to detect a
5¦ ground fault on appearance in said lines, which causes ampli~ler 6l 29 to provide an input to silicon-controlled rectifier 30 which ~:
71 then conducts. ~ . .
81~ During normal circuit conditions, when power line Ll is 91¦ positive with respect to L2, current flows from Ll through diode :
10ll 33, trip coil 1, n-p-n transistor 31 and diode 34 to L2. When ~ L2 becomes positlve with respect to Ll, current ~low is ~rom L2 .
121~ through diode 35, trip coil 1, n-p-n transistor 31 and diode 32 1311 to Ll. Diodes 32, 33, 34 and 35 are thus connected to provide a .
141~ ~ull wave recti~ier circuit between transistor 31 and power lines 15 j! Ll and L2, l 16il When a ground ~ault is detected by differential trans~ormer .
17 1l 28 causing an input to SCR 30, the SCR 30 conducts resulting in 18~:,¦ a low voltage at Junction X. A zener diode 36 prevents current :
19 from flowing in: the base o~ transistor 31 and the transi.stor 31 .
20l goes into a non-conducting or "of~" state. The current in trip . ~
2111 coil 1 is thereby interrupted, whereupon the bias spring 7 over- :
22 1l comes the magnetic attractlon force o~ pole ~ace 3 and urges 23j armature 5 away therefrom causing the protected circuit to be .
24l interrupted as armature~flange 26 disengages ~rom transverse lip . :.
25 1l 25 permittlng contacts 23 and 25 to open, .
26 1 Similarly, when line voltage drops to a pre-determined level 27i', or in the event one of the power lines L1 or L2 is severed, the I ..
28~ trip coil 1 releases the biased armature 5 and interrupts the 29l protected circuit in the manner described.
301 Reset button 27 is mounted ~or reciprocal movement throug~
31~l frame 4 or other support to engage the body 21 Or carri.er member I .
32~ 17 adjacent oontact pivot 22. After carrier member 17 has been 11 I! 1.
~. I ' 1058739 ` ; ~
l rotated to a contact open position as shown in Flg. 2, the J
2 interrupter is reset by depressing re-set button 27 whi.ch urges 3 carrier member 17 against the bias of main coil spring 13 to a 4 contact closed position as shown in Fig. l, I~ the`fault current ;
5 l or under voltage condition is no longer present, trip coil l j-61 again is energized attracting armature 5 to pole face 3 and ~`
7 positioning armature flange 26 to engage transverse lip 2$ of ~
~ 8 contact carrier member 17. When so engaged, contacts 23 and 24 ~.
I 9 are closed and maintained in releasably locked position until a ~ . ~:
ll ~ault current or~under voltage oonditlon again occurs, ~
12 ; ~ . .
131 . . .
14~ . . ::
22~ I ~
24~
28 j ~: 3~
32~
71 then conducts. ~ . .
81~ During normal circuit conditions, when power line Ll is 91¦ positive with respect to L2, current flows from Ll through diode :
10ll 33, trip coil 1, n-p-n transistor 31 and diode 34 to L2. When ~ L2 becomes positlve with respect to Ll, current ~low is ~rom L2 .
121~ through diode 35, trip coil 1, n-p-n transistor 31 and diode 32 1311 to Ll. Diodes 32, 33, 34 and 35 are thus connected to provide a .
141~ ~ull wave recti~ier circuit between transistor 31 and power lines 15 j! Ll and L2, l 16il When a ground ~ault is detected by differential trans~ormer .
17 1l 28 causing an input to SCR 30, the SCR 30 conducts resulting in 18~:,¦ a low voltage at Junction X. A zener diode 36 prevents current :
19 from flowing in: the base o~ transistor 31 and the transi.stor 31 .
20l goes into a non-conducting or "of~" state. The current in trip . ~
2111 coil 1 is thereby interrupted, whereupon the bias spring 7 over- :
22 1l comes the magnetic attractlon force o~ pole ~ace 3 and urges 23j armature 5 away therefrom causing the protected circuit to be .
24l interrupted as armature~flange 26 disengages ~rom transverse lip . :.
25 1l 25 permittlng contacts 23 and 25 to open, .
26 1 Similarly, when line voltage drops to a pre-determined level 27i', or in the event one of the power lines L1 or L2 is severed, the I ..
28~ trip coil 1 releases the biased armature 5 and interrupts the 29l protected circuit in the manner described.
301 Reset button 27 is mounted ~or reciprocal movement throug~
31~l frame 4 or other support to engage the body 21 Or carri.er member I .
32~ 17 adjacent oontact pivot 22. After carrier member 17 has been 11 I! 1.
~. I ' 1058739 ` ; ~
l rotated to a contact open position as shown in Flg. 2, the J
2 interrupter is reset by depressing re-set button 27 whi.ch urges 3 carrier member 17 against the bias of main coil spring 13 to a 4 contact closed position as shown in Fig. l, I~ the`fault current ;
5 l or under voltage condition is no longer present, trip coil l j-61 again is energized attracting armature 5 to pole face 3 and ~`
7 positioning armature flange 26 to engage transverse lip 2$ of ~
~ 8 contact carrier member 17. When so engaged, contacts 23 and 24 ~.
I 9 are closed and maintained in releasably locked position until a ~ . ~:
ll ~ault current or~under voltage oonditlon again occurs, ~
12 ; ~ . .
131 . . .
14~ . . ::
22~ I ~
24~
28 j ~: 3~
32~
Claims (4)
1. A ground fault power circuit interrupter for use in a power circuit having ground fault sensing means for sensing the occurrence of a ground fault above a preselected magnitude, comprising a single magnetic core and coil, armature means operatively associated with and normally attracted to said magnetic core in response to energization of said coil by a current above a predetermined value, power circuit contact means including a movable carrier member carrying a contact and controlled by said armature means for extending said power circuit through said contact in response to the energization of said coil by said current above said pre-determined value, mechanical biasing means to bias said armature from said magnetic core and moving said carrier member and contact to interrupt said power circuit in response to the current in said magnetic coil falling below said predetermined value, control circuit means including rectifier supply means connected to said power circuit, first switch means in said control circuit in a normally conducting state when said control circuit is powered by said rectifier supply means for energizing said coil, a second switch controlled in response to the sensing of a ground fault above said preselected magnitude, threshold switch actuating means having internal circuit responsive variable resistance characteristics for controlling said first switch means to render said first switch means non-conducting and thereby interrupt current in said coil in response to the control of said second switch by said ground fault current above said preselected magnitude, said armature, carrier and contact moved by said biasing means in response to said coil being energized by a current below said predetermined value for interrupting said power circuit, a first conductor extending between said rectifier supply means and said second switch means, a second conductor connected at one end to said first conductor at a junction point thereon between said rectifier supply means and said second switch means and at the other end to said first switch means, said threshold switch actuating means being connected in series in said second conductor between said junction point and said first switch means, and a manually movable reset member engaged with said carrier for moving said carrier and contact against said bias to move said armature toward said core for enabling said armature to control said contact for extending said power circuit in response to the current in said power circuit being above said predetermined value and moved by said carrier in response to said coil being energized by a current below said predetermined value.
2. A ground fault power circuit interrupter as set forth in claim 1, wherein said control circuit includes ground fault sensing means, amplifier means to amplify a ground fault signal voltage, said second switch means in said control circuit being in series with the output of said amplifier means, said second switch means being in a normally non-conducting state and rendered conductive by output from said amplifier means on occurrence of a ground fault, said second switch means being connected in series with said rectifier supply means and in parallel with said threshold switch actuating means whereby when said second switch means is switched to a conducting state by output from said amplifier on occurrence of a ground fault sufficient current is shunted through said second switch means to thereby create a condition at said threshold switch actuating means equivalent to the said low voltage condition of any pre-selected value, said threshold switch actuating means being responsive to such low voltage condition and thereby operating to render said first control circuit switch means non-conducting thus interrupting current in said magnetic core and coil causing said armature to break contact therewith.
3. A ground fault power circuit interrupter as set forth in claim 2, wherein said first control circuit switch means is a transistor and said second control circuit switch means is a silicon controlled rectifier.
4. A ground fault power circuit interrupter as set forth in claim 1, wherein said threshold switch actuating means is a zener diode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48604574A | 1974-07-05 | 1974-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1058739A true CA1058739A (en) | 1979-07-17 |
Family
ID=23930390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA230,013A Expired CA1058739A (en) | 1974-07-05 | 1975-06-24 | Portable ground fault circuit interrupter |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1058739A (en) |
| DE (1) | DE2529713A1 (en) |
| FR (1) | FR2277429A1 (en) |
| GB (1) | GB1521082A (en) |
| IT (1) | IT1036450B (en) |
| ZA (1) | ZA754168B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144516A (en) * | 1991-02-04 | 1992-09-01 | Wing Shing Products Company, Ltd. | Leakage current circuit interrupter device |
| NO304860B1 (en) * | 1991-07-22 | 1999-02-22 | Pdl Holdings Ltd | A switching mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3555360A (en) * | 1969-03-20 | 1971-01-12 | Hubbell Inc Harvey | Phase controlled ground fault circuit interrupter |
-
1975
- 1975-06-24 CA CA230,013A patent/CA1058739A/en not_active Expired
- 1975-06-30 GB GB27489/75A patent/GB1521082A/en not_active Expired
- 1975-06-30 ZA ZA00754168A patent/ZA754168B/en unknown
- 1975-07-03 DE DE19752529713 patent/DE2529713A1/en active Granted
- 1975-07-04 FR FR7521027A patent/FR2277429A1/en active Granted
- 1975-07-04 IT IT68744/75A patent/IT1036450B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2277429B1 (en) | 1981-05-29 |
| IT1036450B (en) | 1979-10-30 |
| ZA754168B (en) | 1976-06-30 |
| GB1521082A (en) | 1978-08-09 |
| FR2277429A1 (en) | 1976-01-30 |
| DE2529713C2 (en) | 1987-10-22 |
| DE2529713A1 (en) | 1976-01-22 |
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