GB1583732A - Circuit breakers - Google Patents
Circuit breakers Download PDFInfo
- Publication number
- GB1583732A GB1583732A GB1721377A GB1721377A GB1583732A GB 1583732 A GB1583732 A GB 1583732A GB 1721377 A GB1721377 A GB 1721377A GB 1721377 A GB1721377 A GB 1721377A GB 1583732 A GB1583732 A GB 1583732A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earth leakage
- circuit breaker
- leakage module
- line circuit
- module
- 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 37
- 230000007935 neutral effect Effects 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/08—Terminals; Connections
- H01H71/082—Connections between juxtaposed circuit breakers
-
- 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
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
- H01H83/226—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with differential transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Breakers (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
(54) IMPROVEMENTS IN CIRCUIT BREAKERS
(71) We, BROWN, BOVERI & CIE A.G., a German Company of D 6800 Mannheim Käfertal, Kallstadter Strafe 1, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to an earth leakage module intended to be appended to an electric circuit breaker having a tripping device which comes into operation with current overloading and short-circuit current, so as additionally to protect against excessive earth leakage current.
It is known to combine a circuit breaker
for overload current and short-circuit current
tripping, herein termed a line circuit breaker, with an earth leakage module to form a combined unit referred to as an earth leakage circuit breaker. The tripping devices for short-circuit and over-load currents and the tripping device for the earth leakage current
are accommodated in a common casing.
Known circuit breakers of this kind take the
form of broad units which consist of several
casing parts and are very awkward to assemble.
In particular, the dimensions of a summating
current transformer, which determines the
maximum permissible earth leakage current,
dictate the overall dimension of such circuit
breakers.
The physical size can be reduced by using
electronic units for measuring the earth leak
age current. However, even electronic units
are too broad for insertion into the totally
enclosed casing which has a standardized width of 17.5 mm.
The present invention seeks to provide an
earth leakage module having a casing so
designed as to provide sufficient space to
accommodate the electrical components but
without exceeding the external dimensions
which are specified by the standards regu
lations.
According to the present invention, there
is provided an earth leakage module for use
in combination with a line circuit breaker
having a casing shell and a tripping device
adapted to respond to overcurrent and short
circuit current, said earth leakage module having a trip mechanism operative to act on the tripping device of the line circuit breaker to protect against excessive earth leakage current and having a casing shell which, in use, is secured to the casing shell of the line circuit breaker and which has a side covered by the line circuit breaker when in use which side comprises a side wall which has an opening, the casing shell of the earth leakage module containing, for sensing earth leakage current, an electronic unit having a transformer through which phase and neutral conductors extend, the trip mechanism being controlled by the said electronic unit, at least the said electronic unit projecting into the opening of the casing shell side wall, the opening serving to increase the available space for containing the components of the earth leakage module.
The opening in the casing shell provides additional space the magnitude of which corresponds to the size of the opening.
Although the space is relatively shallow since it corresponds merely to the side wall thickness (in general, a cover plate) - it should be noted that an additional space of only approximately one-half to approximately two or three millimetres is very desirable in view of the size of the components which have to be inserted.
In a second aspect of the invention, there is provided an earth leakage module for use in combination with a line circuit breaker having a casing shell open on one side and a tripping device adapted to respond to overcurrent and short circuit current, the earth leakage module having a casing shell which in use is secured to the casing shell of the line circuit breaker and having a trip mechanism operative to act on the tripping device of the circuit breaker to protect against excessive earth leakage current, and wherein the casing shell of the earth leakage module has a side cover plate which in use covers the open side of the line circuit breaker and which has a recess facing the interior of the casing shell of the earth leakage module, which casing shell contains, for sensing earth leakage current, an electronic unit having a transformer through which phase and neutral conductors extend, the trip mechanism being controlled by the said electronic unit, at least the said electronic unit projecting into the recess of the said cover plate, the recess serving to increase the available space for containing the components of the earth leakage module.
Embodiments described hereinbelow relate more particularly to an earth leakage module of the kind described hereinbefore in which the earth leakage current is sensed by the electronic unit, and which has a magnetic trip, acting on a latch spindle for releasing a latch of the circuit breaker, with a switching and indicating mechanism. In one embodiment of such an earth leakage module the switching and indicating mechanism as well as the magnetic trip and the latch spindle are disposed in an end region of the earth leakage module, the electronic unit is accommodated beneath these parts between terminals, and at least the electronic unit projects into the opening, which may be in the bottom of the casing shell or in a cover plate, or projects into the recess, provided in the cover plate.
A particularly advantageous utilization of the idea of the invention can be achieved if the opening or the recess extends over the casing region occupied by the magnetic trip, by the switching and indicating mechanism and by the electronic unit. This enables a relatively large amount of space to be obtained which can in fact be substantially utilized if the components and the conductor runs are suitably shaped.
Preferably, a terminal for the neutral conductor (Mp) is provided on the side of one of the narrow sides of the earth leakage module but on each of the opposite narrow sides there is provided an output terminal for a phase conductor and for the neutral conductor and the said terminals are laterally covered by extended portions of the bottom of the casing shell and/or of its cover plate.
This leads to a particularly reliable wiring system with low tracking currents.
By utilizing the invention and its embodiments it is possible to combine an earth leakage module with a line circuit breaker in such a way as to produce an earth leakage circuit breaker the width of which corresponds to twice the standardized width of a line circuit breaker - altogether therefore 35 mm.
The invention will now be described further, by way of example, with reference to the accompanying drawings in which:
Figure 1 its a diagrammatically indicated cross-section through a single-pole line circuit breaker with an associated earth leakage module;
Figure 2 shows a circuit diagram for the line circuit breaker according to Figure 1 which is coupled to the earth leakage module;
Figure 3 is a plan view of the combined line circuit breaker and earth leakage module of Figure 1;
Figure 4 is a view in the direction of the arrow III of the earth leakage tnodule illustrated in Figure 3, the cover plate and the line circuit breaker having been removed; and
Figure 5 is a cross-section similar to Figure 1 through a single-pole line circuit breaker with attached earth leakage module but with a cover plate common to both parts.
Figure 1 shows a cross-section through an earth leakage circuit breaker comprising a single pole line circuit breaker 31 and an earth leakage module 32. Figure 1 is a diagrammatic view, the individual components not being shown in detail. A normal, commercial circuit breaker for a single phase conductor is used as the line circuit breaker 31. The earth leakage module 31 comprises a casing part 19d which is covered on the side adjacent the line circuit breaker 31 with a cover plate 19b that is shaped to the contour of the earth leakage module 32 and has an opening l9c.
As shown in greater detail in Figures 3 and 4, the earth leakage module 32 has an electronic earth leakage sensing device 33, briefly referred to as the electronic unit 33, which incorporates a transformer 34 through which extends a phase conductor P and the neutral conductor Mp as indicated in the drawing.
The earth leakage module 32 according to
Figure 4 is provided on its end face with a trip mechanism 35 and an indicating and switching mechanism 36 having a latch spindle 36a and a coupling member, now shown in detail, for coupling to the line circuit breaker 31. The electronic unit 33, which can be regarded as already known, fills practically the entire space between three terminals of which only one terminal having the reference numeral 37 is disposed on one side of the earth leakage module 32 but two terminals 38 and 39 are disposed one above the other on the other side. The earth leakage module also has a connecting tag 40 which is connected to one of the terminals 311 of the line circuit breaker 31 by means of a screw which may only be removed by a purpose made tool.
The wiring of line circuit breaker 31 and the earth leakage module 32 is shown diagrammatically in Figure 2. The phase conductor P, designated 41, is connected to the terminal 312 on the line circuit breaker 31. Within the line circuit breaker 31 is a contact set 313, the coil 314 of a short-circuit trip and a thermal bimetal unit 315 which is provided for overload current tripping. The phase conductor extends from the terminal 312 of the line circuit breaker 31 via the contact set 313, the coil 314 and the thermal bimetal unit 315 to the other terminal 311. The connecting tag 40 of the earth leakage module 32 is connected to the said terminal 311; the electrical connection within the earth leakage module as far as the terminal 39 of the earth leakage module is provided by a conductor 321 which extends from the connecting tag 40 between the electronic unit 33 and the rear casing wall 322 to the narrow side of the earth leakage module opposite the connecting tag 40 and from there passes into the electronic unit 33.
The conductor passes through the transformer 34 which in the present example comprises two transformer parts 341 and 342, and is then connected to the terminal 39. In assembled single-pole circuit breakers, it is then merely necessary to connect the incoming conductor to terminal 312 and the outgoing conductor to terminal 39. The neutral conductor Mp, having the reference numeral 42, is connected to the terminal 37 which within the earth leakage module 32, is connected through the transformer 34 of the electronic unit 33 to the terminal 38.
The special construction of the earth leakage module with the electronic unit 33, in particular the side surface which is open to the line circuit breaker 31 and is covered with the open cover plate 19b ensures that an earth leakage circuit breaker for one phase can be assembled from two adjacently disposed components both of which have the same dimensions transversely to their side surfaces; both having a width of only 17.5 mm.
Though not shown, the two parts 31 and 32 are joined to each other by means of screw fasteners to form a unitary functional unit which can be snap mounted on a standardized sectional support rail and can be used for short-circuit, overload current and earth leakage current tripping.
Figure 5 shows - in schematic form and similar to the view in Figure I - an embodiment which provides a gain in space for parts of an earth leakage module in the same way as is provided by the previously illustrated and explained solutions. In this case a commercial or stock line circuit breaker 41 is also used but without its own cover plate. The said line circuit breaker 41 has attached to it an earth leakage module 42 which has a separate cover plate 43 with a large-area recess 44 - comparable to the opening 1 9c in the cover plate 19b of Figure 1. Functional components, and possibly terminal and conductor parts, (not shown) of the earth leakage module extend into the said recess 44 so that the necessary space is made available for such components.
It should be noted that the cover plate 43 is given a shape which corresponds approximately to that of the two adjacently disposed cover plates according to Figure 1; the cover plate 43 therefore represents a combination into a single part of the cover plates shown in that illustration. The casing shell of the line circuit breaker 41 as well as the casing shell of the earth leakage module 42 can be completely identical to those illustrated in Figure 1; both casing shells have the same width of less than 17.5 mm; the entire functional unit however as illustrated in Figure 5 in this case also has a width of 35 mm. In principle it is possible for the casing shell of the earth leakage module to be broader, namely to have an overall width of 17.5 mm, i.e. the desired standardized width. By contrast, the solution illustrated in Figure 5 has a narrower width with the advantage that one of the same casing shells can be employed for earth leakage modules with separate, perforated cover plates for attachment to intrinsically enclosed line circuit breakers (according to Figure 1) as well as for earth leakage modules which are to be associated with line circuit breakers without their own cover plates (according to
Figure 5). The attachment of an earth leakage module with a broadened casing - as indicated above - directly to an intrinsically enclosed line circuit breaker of the kind shown in
Figure 1 is not directly possible because the terminals of the earth leakage module require covering on both sides (see also Figures 3 and 4) a feature which cannot be offered by a commercial line circuit breaker or its conventional cover plate.
Finally it should be mentioned that complete opening of the cover plate 43 illustrated in Figure 5 is also feasible in which case the gain in space can be increased still further and other modifications and embodiments are also feasible within the scope of the invention as set out in the appended claims.
WHAT WE CLAIM IS:
1. An earth leakage module for use in combination with a line circuit breaker having a casing shell and a tripping device adapted to respond to overcurrent and short-circuit current, said earth leakage module having a trip mechanism operative to act on the tripping device of the line circuit breaker to protect against excessive earth leakage current and having a casing shell which, in use, is secured to the casing shell of the line circuit breaker and which has a side covered by the line circuit breaker when in use which side comprises a side wall which has an opening, the casing shell of the earth leakage module containing, for sensing earth leakage current, an electronic unit having a transformer through which phase and neutral conductors extend, the trip mechanism being controlled by the said electronic unit, at least the said electronic unit projecting into the opening of the casing shell side wall, the opening serving to increase the available space for containing the components of the earth leakage module.
2. An earth leakage module for use in combination with a line circuit breaker having a casing shell open on one side and a tripping device adapted to respond to over-current and short circuit current, the earth leakage module having a casing shell which in use is secured to the casing shell of the line circuit breaker and having a trip mechanism operative to act on the tripping device of the circuit breaker to protect against excessive earth leakage current, and wherein the casing shell of the earth leakage module has a side cover plate which in
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (12)
- **WARNING** start of CLMS field may overlap end of DESC **.322 to the narrow side of the earth leakage module opposite the connecting tag 40 and from there passes into the electronic unit 33.The conductor passes through the transformer 34 which in the present example comprises two transformer parts 341 and 342, and is then connected to the terminal 39. In assembled single-pole circuit breakers, it is then merely necessary to connect the incoming conductor to terminal 312 and the outgoing conductor to terminal 39. The neutral conductor Mp, having the reference numeral 42, is connected to the terminal 37 which within the earth leakage module 32, is connected through the transformer 34 of the electronic unit 33 to the terminal 38.The special construction of the earth leakage module with the electronic unit 33, in particular the side surface which is open to the line circuit breaker 31 and is covered with the open cover plate 19b ensures that an earth leakage circuit breaker for one phase can be assembled from two adjacently disposed components both of which have the same dimensions transversely to their side surfaces; both having a width of only 17.5 mm.Though not shown, the two parts 31 and 32 are joined to each other by means of screw fasteners to form a unitary functional unit which can be snap mounted on a standardized sectional support rail and can be used for short-circuit, overload current and earth leakage current tripping.Figure 5 shows - in schematic form and similar to the view in Figure I - an embodiment which provides a gain in space for parts of an earth leakage module in the same way as is provided by the previously illustrated and explained solutions. In this case a commercial or stock line circuit breaker 41 is also used but without its own cover plate. The said line circuit breaker 41 has attached to it an earth leakage module 42 which has a separate cover plate 43 with a large-area recess 44 - comparable to the opening 1 9c in the cover plate 19b of Figure 1. Functional components, and possibly terminal and conductor parts, (not shown) of the earth leakage module extend into the said recess 44 so that the necessary space is made available for such components.It should be noted that the cover plate 43 is given a shape which corresponds approximately to that of the two adjacently disposed cover plates according to Figure 1; the cover plate 43 therefore represents a combination into a single part of the cover plates shown in that illustration. The casing shell of the line circuit breaker 41 as well as the casing shell of the earth leakage module 42 can be completely identical to those illustrated in Figure 1; both casing shells have the same width of less than 17.5 mm; the entire functional unit however as illustrated in Figure 5 in this case also has a width of 35 mm. In principle it is possible for the casing shell of the earth leakage module to be broader, namely to have an overall width of 17.5 mm, i.e. the desired standardized width. By contrast, the solution illustrated in Figure 5 has a narrower width with the advantage that one of the same casing shells can be employed for earth leakage modules with separate, perforated cover plates for attachment to intrinsically enclosed line circuit breakers (according to Figure 1) as well as for earth leakage modules which are to be associated with line circuit breakers without their own cover plates (according to Figure 5). The attachment of an earth leakage module with a broadened casing - as indicated above - directly to an intrinsically enclosed line circuit breaker of the kind shown in Figure 1 is not directly possible because the terminals of the earth leakage module require covering on both sides (see also Figures 3 and 4) a feature which cannot be offered by a commercial line circuit breaker or its conventional cover plate.Finally it should be mentioned that complete opening of the cover plate 43 illustrated in Figure 5 is also feasible in which case the gain in space can be increased still further and other modifications and embodiments are also feasible within the scope of the invention as set out in the appended claims.WHAT WE CLAIM IS: 1. An earth leakage module for use in combination with a line circuit breaker having a casing shell and a tripping device adapted to respond to overcurrent and short-circuit current, said earth leakage module having a trip mechanism operative to act on the tripping device of the line circuit breaker to protect against excessive earth leakage current and having a casing shell which, in use, is secured to the casing shell of the line circuit breaker and which has a side covered by the line circuit breaker when in use which side comprises a side wall which has an opening, the casing shell of the earth leakage module containing, for sensing earth leakage current, an electronic unit having a transformer through which phase and neutral conductors extend, the trip mechanism being controlled by the said electronic unit, at least the said electronic unit projecting into the opening of the casing shell side wall, the opening serving to increase the available space for containing the components of the earth leakage module.
- 2. An earth leakage module for use in combination with a line circuit breaker having a casing shell open on one side and a tripping device adapted to respond to over-current and short circuit current, the earth leakage module having a casing shell which in use is secured to the casing shell of the line circuit breaker and having a trip mechanism operative to act on the tripping device of the circuit breaker to protect against excessive earth leakage current, and wherein the casing shell of the earth leakage module has a side cover plate which inuse covers the open side of the line circuit breaker and which has a recess facing the interior of the casing shell of the earth leakage module, which casing shell contains for sensing earth leakage current, an electronic unit having a transformer through which phase and neutral conductors extend, the trip mechanism being controlled by the said electronic unit, at least the said electronic unit projecting into the recess of the said cover plate, the recess serving to increase the available space for containing the components of the earth leakage module.
- 3. An earth leakage module as claimed in claim 1 in which the said side wall is a cover plate.
- 4. An earth leakage module as claimed in claim 1, 2 or 3 provided with a magnetic trip, equipped with a switching and indicating mechanism and which in use acts on a latch spindle for releasing a latch of associated circuit breaker, and wherein the switching and indicating mechanism as well as the magnetic trip and the latch spindle are disposed in an end portion of the earth leakage module, the electronic unit is accommodated beneath the said parts between the terminals, and at least one of the above-mentioned components of the earth leakage module projects into the said opening or recess.
- 5. An earth leakage module as claimed in claim 4, in which the opening or recess extends over the region of the casing occupied by the magnetic trip, by the switching and indicating mechanism and by the electronic unit.
- 6. An earth leakage module as claimed in claim 4 or 5, in which a terminal for the neutral conductor is provided on one of the narrow sides of said earth leakage module, and an output terminal for a phase conductor and for the neutral conductor are provided on the opposite narrow side and in which these terminals are covered on the side by forwardly extended parts of the bottom of its casing shell and/or of a cover plate of said casing shell.
- 7. An earth leakage module as claimed in any of claims 4 to 6, in which a connecting tag, which is to be connected to a phase conductor, is formed transversely to the side surface of said earth leakage module and the said connecting tag extends through the opening in the bottom of the casing shell or in the cover plate and is rigidly connectable to the line circuit breaker.
- 8. An earth leakage module as claimed in claim 7, in which a terminal screw is provided for the (rigid) connection between the connecting tag and the output terminal on the circuit breaker.
- 9. An earth leakage module as claimed in claim 7 or 8, which, when combined with the line circuit breaker, is electrically connectable to a phase conductor as follows: the phase conductor is led in by way of an input terminal of the line circuit breaker, through an overcurrent trip and a short-circuit current trip of the line circuit breaker to an output terminal of the circuit breaker, the output terminal of the circuit breaker is connected to the connecting tag of the earth leakage trip, a conductor extends from the terminal tag through the electronic unit and, within said module through its transformer, and terminates at an output terminal of the earth leakage trip which in turn is connectable to the load, the neutral conductor from the mains is connected to an input terminal on the earth leakage module which leads by way of the transformer of the electronic module to a second output terminal on the earth leakage module which said terminal in turn is connectable to the neutral conductor which extends to the load, at least some of the conductors extending to the earth leakage module passing in the region of the said opening or in the said recess.
- 10. An earth leakage module as claimed in claim 9, in which the phase conductor is guided within the earth leakage module to pass from the connecting tag, between the electronic unit and the casing side wall around the electronic unit, into the said unit through the transformer or transformers to the output terminal on the earth leakage module, the said conductors being guided at least partially in the region of the said opening or recess in the casing side wall.
- 11. An earth leakage module as claimed in any preceding claim in combination with a line circuit breaker in which the casing of the line circuit breaker or a cover plate of the line circuit breaker has an opening for receiving functional parts which emerge from the earth leakage module.
- 12. An earth leakage module substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762618288 DE2618288C3 (en) | 1976-04-27 | 1976-04-27 | Installation circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1583732A true GB1583732A (en) | 1981-02-04 |
Family
ID=5976309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1721377A Expired GB1583732A (en) | 1976-04-27 | 1977-04-25 | Circuit breakers |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT376522B (en) |
| BE (1) | BE854008A (en) |
| DE (1) | DE2618288C3 (en) |
| FR (1) | FR2349945A1 (en) |
| GB (1) | GB1583732A (en) |
| IT (1) | IT1081466B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2834327C2 (en) * | 1978-08-04 | 1983-01-13 | Heinrich Kopp Gmbh & Co Kg, 8756 Kahl | Full electrical circuit breaker |
| FR2440609A1 (en) * | 1978-11-06 | 1980-05-30 | Merlin Gerin | Auxiliary test block for differential protection circuit breaker - permits remote operation of test circuit on circuit-breaker and has fuse and protective contact shunted by resistance lamp parts |
| DE3374487D1 (en) * | 1982-08-19 | 1987-12-17 | Bbc Brown Boveri & Cie | Circuit breaker with leakage current release |
| US4568899A (en) * | 1984-03-27 | 1986-02-04 | Siemens Aktiengesellschaft | Ground fault accessory for a molded case circuit breaker |
| DE8633276U1 (en) * | 1986-12-12 | 1991-05-02 | Asea Brown Boveri AG, 6800 Mannheim | Circuit breaker combination |
| FR2656464B1 (en) * | 1989-12-22 | 1992-03-27 | Merlin Gerin | INSULATING HOUSING FOR A PASSIVE OR SECTIONAL NEUTRAL DIFFERENTIAL CIRCUIT BREAKER. |
| DE29704168U1 (en) * | 1997-03-07 | 1998-07-09 | Siemens AG, 80333 München | Residual current circuit breaker for the operation of circuits with protection type zero |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1371007A (en) * | 1963-09-26 | 1964-08-28 | Siemens Ag | Safety electric circuit breaker with switch triggered by excess current, short circuits and fault currents |
| US3636482A (en) * | 1970-05-25 | 1972-01-18 | Federal Pacific Electric Co | Modular circuit breakers and panelboards with ground-fault protection |
| US3784940A (en) * | 1972-09-15 | 1974-01-08 | Federal Pacific Electric Co | Circuit breaker with overcurrent and auxiliary releases |
| US3855502A (en) * | 1973-02-22 | 1974-12-17 | Ite Imperial Corp | Ground fault interrupter device |
| US3812400A (en) * | 1973-03-05 | 1974-05-21 | Ite Imperial Corp | Modular ground fault interrupter |
-
1976
- 1976-04-27 DE DE19762618288 patent/DE2618288C3/en not_active Expired
-
1977
- 1977-04-22 AT AT285677A patent/AT376522B/en not_active IP Right Cessation
- 1977-04-25 GB GB1721377A patent/GB1583732A/en not_active Expired
- 1977-04-26 IT IT4911777A patent/IT1081466B/en active
- 1977-04-26 FR FR7712621A patent/FR2349945A1/en active Granted
- 1977-04-27 BE BE177063A patent/BE854008A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2349945A1 (en) | 1977-11-25 |
| DE2618288C3 (en) | 1980-09-18 |
| ATA285677A (en) | 1984-04-15 |
| BE854008A (en) | 1977-08-16 |
| DE2618288A1 (en) | 1977-11-17 |
| FR2349945B1 (en) | 1983-03-25 |
| DE2618288B2 (en) | 1980-01-31 |
| IT1081466B (en) | 1985-05-21 |
| AT376522B (en) | 1984-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |