EP1710822A1

EP1710822A1 - Compact disconnector

Info

Publication number: EP1710822A1
Application number: EP05380061A
Authority: EP
Inventors: Jose Julio Gomez Barbero
Original assignee: Pronutec SA
Current assignee: Pronutec SA
Priority date: 2005-04-04
Filing date: 2005-04-04
Publication date: 2006-10-11
Anticipated expiration: 2025-04-04
Also published as: ES2318439T3; DE602005011757D1; EP1710822B1; ATE418150T1; PL1710822T3

Abstract

The disconnector comprises a casing (1) on the interior of which is partially housed an input plate (2) and an output plate (3) the ends of which are connected respectively to the supply and the distribution bus bars of the low-voltage switchboard and contacts (4) and (5) for coupling or uncoupling to the input (2) and output (3) plates. Specifically, the input (2) and output (3) plates are mounted inside the casing (1) in a horizontal position, one over the other, coming out to the exterior of the casing, through its rear part, for input to the supply and the distribution bus bars, in a horizontal position and one over the other.

Description

OBJECT OF THE INVENTION

The disconnector object of the invention has a new internal configuration, both in the position of the input and output plates, and in the structure and movement of the movable contacts which, maintaining the habitual functions of an disconnector, allow the height of the disconnector to be reduced and thereby possibly incorporated in low-voltage switchboards, in three-pole and four-pole assemblies, in a vertical position, with no need to use auxiliary bars for input. Thus, it is possible to manufacture disconnectors which can adapt to the different designs of low-voltage switchboards.
It is also an object of the invention that the coupling of the movable contacts on the input and output plates is flexible, with a defined and constant contact surface area and that it be carried out with a uniform force, both characteristics providing a better electrical contact.
It is also an object of the invention that the vertical assemblies formed by several compact disconnectors be installed in "185 mm bus bar systems" without needing adapters or additional pieces, thereby simplifying the construction of the low-voltage switchboards which employ these bus-bar systems.
In addition, the disconnector object of the invention is intended to provide a number of auxiliary functions such as housing a current transformer, outputs for auxiliary and measurement circuits and an auxiliary input (emergency input), to the low-voltage switchboard. These functions will be added to the disconnector as options which will permit different configurations of disconnector according to the options installed.

BACKGROUND OF THE INVENTION

A low-voltage disconnector is an assembly which, when installed in the head of a low-voltage switchboard, has the function of assuring the interruption of the low-voltage supply line to the switchboard when the disconnector is open, in this way it isolates the low-voltage switchboard from the electricity supply. At the present time disconnectors are combinations of several poles in a horizontal arrangement, these disconnectors comprise a certain number of poles, a control mechanism and a supporting frame, in the event that the frame is an electrical conductor the poles will be supported by insulators.
There are also single-pole disconnectors, each pole being a module independent of the remaining poles, these single-pole modules allow both horizontal and vertical combinations to be mounted.
The assemblies constructed from single-pole modules can be two-pole (2 phases or phase plus neutral), three-pole (3 phases) or four-pole (3 phases plus neutral).
The two-pole, three-pole or four-pole assemblies, comprise logically two, three or four subsets of single-pole modules, properly assembled, it being possible to have an arrangement, both horizontal and vertical, at fixed or variable distances between the subsets, depending on the application in question.
A single-pole disconnector generally comprises a casing which houses partially in the interior thereof some input and output plates in a vertical arrangement which, through their free end, are connected to the electricity supply and to the distribution bus bars of the low-voltage switchboard respectively, as well as by some contacts or metallic blades which are mounted on a folding cover, which folding cover can occupy two positions, a position in which the contacts or blades are mounted on the input and output plates, the cover and the disconnector being closed in this position, whilst when the cover is open, the blades are separated with respect to the input plate and the disconnector is open.
One of the contacts of the disconnector is fixed, being screwed to the folding cover, whilst the other contact is movable and is linked to the previous one through a mechanism. Both contacts are joined by a screw to the output plate, this screw constituting the tilting point of the contact assembly with respect to the input and output plates, both fixed to the casing.
The electrical contact between the contacts and the input and output plates is achieved by the displacement of the movable contact and by the deformation of the fixed contact (screwed to the folding cover) and of the input and output plates (both screwed to the casing), as a consequence of the pressure which is applied with the operating mechanism. The movement of the movable contact, the deformation of the fixed contact and of the input and output plates as well as the pressure necessary to maintain this force constant, is produced by an external manually operated lever.
With this type of configuration, for opening the disconnector it is necessary to insert the external manually operated lever into a hole provided in the folding cover and by turning operate the mechanism which causes separation of the contacts, and thereafter provoke the opening of the cover by tilting the same.
Finally, by turning the operating lever again, the disconnector is blocked, which operation allows the lever to be removed and the cover to remain open with no possibility of being closed accidentally.
Of course, the closing of the disconnector signifies the insertion of the lever in the cover, the turning of the same to be able to carry out the tilting and closing, and a further turning of the key to produce the bringing together of the contacts and their coupling on the input and output plates.
This type of disconnector has a series of drawbacks and, especially, the fact that in the open position of the disconnector the cover is open and it would therefore be possible to access the interior of the same, and so touch live pieces since one of the contacts is always in contact with the output plate. This type of actuation, logically, can cause accidents.
Another drawback relates to the fact that one of the contacts is joined to the cover and only the other contact is displaced, which results in the electrical contact depending on the deformation of the input and output plates and of the fixed contact. In addition, it is impossible to know the effective contact surface between the contacts or blades and the input and output plates, nor if this contact surface is repetitive in the disconnectors mounted in a given two-pole, three-pole or four-pole assembly.
Another drawback relates to the fact that the contacts are always in contact with the output plate, being displaced only with respect to the input blade the isolating gap depending on a single point, namely the contacts - input plate spacing. With the current solution there is no certainty that the operation has been carried out correctly, the case can arise in which the cover is not fully tilted leaving the contacts in an intermediate position without having completed the isolating operation.
To ensure that both the open position and the closed position of the cover are stable positions, that is, they cannot be changed accidentally, it is necessary to rotate the operating handle since otherwise it is impossible to extract the cited handle. This is achieved based on the tubular end of the operating handle having a fluke, by way of a key, which only allows the extraction of the wheel when the fluke coincides with a hole of similar dimensions provided in the movable cover of the disconnector. The problem is that the operative can remove the cited fluke from the handle, to simplify his operations, but resulting in the disconnector being left in a dangerous position.
Another drawback relates to the fact that the input and output plates are mounted vertically, which defines a height of the single-pole module which, when it is used in three-pole or four-pole configurations, results in the input and output plates of the remaining subsets being widely separated from each other, requiring additional bars for their connection to the main bus bars of a low-voltage switchboard in which the outputs are obtained with DIN type three-pole vertical bases which habitually come at a standard spacing of 185 mm. This arrangement of the input and output plates means that the disconnectors are very rigid elements when designing low-voltage switchboards, which means that the disconnector conditions the design of the low-voltage switchboard.
The disconnector object of the invention has a special configuration which allows all the described drawbacks to be overcome.

DESCRIPTION OF THE INVENTION

The disconnector of the invention is a single-pole disconnector the input and output plates of which are arranged in a horizontal position, one over the other, having a vertical segment (fixed contact) on which some movable contacts make or break which are displaced linearly in a direction parallel to the input and output plates, in opposing senses, coming closer to couple on the vertical segments of the input and output plates (fixed contacts of the disconnector), in the closing of the disconnector, or moving away to produce the opening of the disconnector.
None of the movable contacts is fixed to the casing of the disconnector. The movable contacts are mounted on an axle parallel to the input and output plates which can be displaced axially with respect to the fixed input and output contacts, with the particularity that the rear movable contact is mounted on the axle and is displaced in conjunction with the same, whilst the front movable contact can slide with respect to the axle.
The operation is produced by means of an external lever which can tilt in the vertical direction, this movement being transformed, through an eccentric, into the linear movement of the front and rear movable contacts. For this, the eccentric is joined in an articulated manner to the axle. The front movable contact is linked to the casing through two springs.
In the closing of the disconnector the operation of the external lever causes the eccentric to tilt which, on one hand pushes one of the movable contacts of the disconnector whilst pulling on the other movable contact, thereby causing the simultaneous movement in opposing senses of both contacts in the direction parallel to the input and output plates.
In the opening of the disconnector the working of the external lever causes the eccentric to tilt which, on one hand pushes one of the movable contacts of the disconnector whilst the spring pulls on the other movable contact, thereby causing the simultaneous movement in opposing senses of both contacts in the direction parallel to the input and output plates.
To achieve a good electric contact with a constant contact force and independent of the opening and closing operation there are individual springs on the front movable contact and on the rear movable contact. The springs on being compressed deliver a force constant with time. This spring allows the force of the contact to be varied according to requirements without varying the configuration of the disconnector.
To be able to define the contact surface between the contacts or movable blades and the fixed contacts (vertical ends of the input and output plates inside the casing of the disconnector) and that this be repetitive in all the disconnectors, the movable contacts have a series of protuberances so that the number of contact points present on each movable contact are fixed, the contact surface area can be known and repetitivity assured in all the disconnectors manufactured.
As described, both the rear movable contact, and the front movable contact are displaced to be coupled, each one over one of the faces of the input and output fixed contacts, this movement being caused by the eccentric, both movable contacts being applied against the fixed contacts with identical force, which together with the fact that the axle is not fixed to the casing, allows a certain degree of adaptation or adjustment between the movable contacts and the input and output fixed contacts, thereby obtaining a better electrical contact.
The displacement of the movable contacts and the movement of the eccentric take place inside the casing, without it being necessary to open covers. This avoids contact with live elements thereof.
The external operating lever is inserted through some holes foreseen in the casing, with the particularity that insertion is only possible in two points corresponding to the position of "disconnector open" and to the position of "disconnector closed", passing from one to the other by tilting the lever. It is not possible to insert or to extract the lever in intermediate positions. In this way it is assured that the operation is completed, the disconnector is always in safe positions (open or closed). In the event that the operation was not concluded, it would not be possible to extract the lever which would remain fixed in the disconnector indicating an unsafe position of the same.
The lever has some ribs which fit in some channels foreseen in the eccentric, in such a way that the tilting of the lever causes a similar movement of the eccentric which pushes one of the movable contacts and, pulls the axle which in turn moves the other movable contact, causing the coupling of the movable contacts on the fixed contacts and the closing of the disconnector, or their separation and therefore, the opening of the disconnector.
All the operations are performed without the displacement of covers on the disconnector which could provide direct access to the live parts of the disconnector, at all times maintaining protection for the operatives against direct contact with live parts and the introduction of objects foreign to an IP20.
The disconnector object of the invention also has a series of auxiliary functions independent of the main function and physically separate therefrom. These auxiliary functions can be present in the disconnector or not, they are mounted after assembling the disconnector and it is not necessary to dismantle it to install them. These functions are, current transformer, voltage tap and terminal posts for feeding auxiliary circuits. They are described below:
The disconnector allows the incorporation of a current transformer which is mounted or removed without having to open the casing of the disconnector and which therefore can be incorporated, as required, in the disconnector after assembly. In addition, the current transformer can be easily removed and replaced with a new one in the event of a fault.
To avoid the incorporation of the current transformer modifying the measurements of the disconnector, the current transformer incorporated is a core with the coil necessary for the definition of the same. The current transformer does not have a casing and it is the actual casing of the disconnector which protects the current transformer.
The output of the current transformer is the actual winding of the core which is taken to the output terminal posts for feeding auxiliary circuits of the disconnector.
The disconnector has an accessible point on the output plate and another on the input plate for a voltage tapping should the need arise.
The disconnector in the upper part of the casing, can incorporate terminal posts for feeding auxiliary circuits with both voltage and current or both. Said terminal posts are protected by a cover or hood in the upper part of the disconnector.
The disconnector has channels on both sides of the casing, to run the cables from the current transformer or from the voltage tap to the output terminal posts for feeding auxiliary circuits, these channels are protected with individual covers. In this way the cables are protected from mechanical damage which could arise in the normal use of the disconnector.
Since the disconnector has individual channels on each side of the casing, the current and voltage cables are laid along each of the channels, they are separate and form independent circuits in the disconnector.
Incorporation has been foreseen in the disconnector of an auxiliary input or emergency input to feed the low-voltage switchboard, through the actual disconnector, when the main supply fails, this operation being carried out in a safe way with the disconnector in the open or closed position.
This auxiliary input or emergency input is included inside the disconnector in the compartment with the contacts.
The connection of the cables to this auxiliary or emergency input is made through the front of the disconnector. For this, independent access has been foreseen in the lower front part of the disconnector for one or two supply cables.
The connection of the cables is made from the sides of the disconnector with an insulated key having a degree of protection during this operation of IP 20.
The disconnector object of the invention, allows the mounting of vertical assemblies of several poles to be installed in "185 mm bus bar systems" with no need for adapters or additional pieces simplifying the design and construction of the distribution switchboards which have these bus-bar systems.

DESCRIPTION OF THE DRAWINGS

To complete the description that is being made and with the object of assisting in a better understanding of the characteristics of the invention, in accordance with a preferred embodiment of the same, this description is accompanied with a set of drawings, as an integral part thereof, wherein by way of illustration and not restrictively, the following has been represented:

Figure 1. - It shows an external perspective of an disconnector in accordance with the object of the invention.
Figure 2. - It shows a perspective of the internal part of the disconnector, for which part of the casing has been suppressed.
Figure 3. - It shows a side view of the inside of the disconnector, in the closed position.
Figure 4. - It shows a side view of the inside of the disconnector in an intermediate position.
Figure 5. - It shows a side view of the inside of the disconnector in the open position.
Figure 6. - It shows the operating eccentric.
Figure 7. - It shows the operating key.
Figure 8. - It shows the axle with the rear movable contact mounted.
Figure 9. - It shows the front movable contact.
Figure 10. - It shows a perspective of the assembly of the front and rear movable contacts on the axle and the manner of linking the eccentric to the front assembly.
Figure 11. - It shows an four-pole vertical assembly constituted by four disconnectors according to the object of the invention.
Figure 12. - It shows an disconnector with auxiliary input or emergency input.
Figure 13. - It shows a rear view of the disconnector object of the invention.
Figure 14. - It shows an disconnector with auxiliary input or emergency input in which part of the casing has been suppressed.

PREFERRED EMBODIMENT OF THE INVENTION

The disconnector object of the invention, is constituted by a body formed by a casing (1) inside which are partially housed some input (2) and output (3) plates which are mounted in a horizontal position, inside the casing (1).
The input (2) and output (3) plates have individual vertical segments inside the casing (2') and (3') on which the closing of the disconnector will take place, through a front movable contact (4) and a rear movable contact (5) which can be coupled on the opposing faces of the vertical segments (2'), (3') of the input (2) and output (3) plates.
The drive mechanisms which allow the opening or closing of the disconnector are constituted by an external operating lever (6), an operating eccentric (7), an axle (8) and a spring.
The axle (8) is supported at its ends in individual bushings or housings foreseen inside the casing (1), it being possible for the axle (8) to move in the axial direction with respect to the cited bushings or housings. On the axle (8) the rear movable contact (5) is mounted in a fixed manner, by a nut and washer, so that said contact is displaced in conjunction with the axle (8), whilst the front movable contact (4) is mounted on the axle (8) through a supporting platform (9) and a bushing (10), in such a way that the front movable contact (4) can slide axially with respect to the axle (8).
The operating eccentric (7) is joined in an articulated manner to the axle (8), through a pin (11) which traverses holes in eccentric and axle, the hole of the eccentric being slightly off-center so that the turning or the rocking of the eccentric (7) will cause the axial displacement of the axle (8).
The eccentric is also linked to the front movable contact (4) through the spring, in such a way that the rocking or turning of the eccentric causes the displacement of the front movable contact (4) with respect to the axle (8) on which it is mounted.
The operating eccentric (7) has, on each of its faces, individual channels (12) in which are housed some ribs (13) foreseen in the external operating lever (6), so that the tilting of the lever (6) causes the turning of the operating eccentric (7).
The tilting of the lever (6) is guided by means of a slot (14) foreseen in the casing (1) which extends longitudinally in the vertical direction to allow the lever (6) to pass, which slot is finished on its ends in individual holes (15) and (16), the section of which corresponds to the ribs (13) of the lever, so that it is only possible to introduce the lever (6) in the two extreme positions of the slot, corresponding respectively with the open and closed position of the disconnector. Thus, it is impossible to extract the lever in an intermediate position which does not correspond to one of the two safe positions, disconnector open or closed, and which can result in a poor contact in closing or a false opening which could provoke an accident.
In addition, in the event that accidentally or deliberately the ribs (13) were removed from the lever (6), which would allow its insertion in any position of the slot (14), the lever could not act on the operating eccentric (7), whereby it would be impossible to change the position of the disconnector.
With this structure, the operation of the disconnector would be as follows:

Opening the disconnector. The lever (6) is inserted in the upper position (15) of the slot (14) and is tilted downward until reaching the lower limiting position. The tilting of the lever causes the turning, anticlockwise, of the operating eccentric (7) which, being joined to the axle (8) through the pin (11), causes the axial displacement of the axle (8) and the consequent separation of the rear movable contact (5) secured to the cited axle. Simultaneously, the tilting of the eccentric (7) pulls the front movable contact (4) through the spring which links the casing (1) with the supporting platform (9) firmly joined to the front contact (4). The movement of the front contact (4) and of the support (9) is produced by sliding with respect to the axle (8).

When the lever (6) is in the lower position (16), its extraction is possible, the disconnector remaining in the open position, this being a safe position since to act on the disconnector the insertion of the lever (6) is necessary, through the lower hole (16) of the slot (14).
Closing the disconnector. The lever (6) is inserted in the lower hole (16) of the slot (14) and its tilting takes place until reaching the upper limiting position (15) of the slot (14).
The tilting of the lever (6) produces a clockwise turning of the eccentric (7) which pushes against the supporting platform (9) causing the displacement of the front movable contact (4) toward the input and output plates (2), (3), whilst it pulls the axle (8) causing the approach of the rear movable contact (5) which is brought closer to the input and output plates (2), (3).
Each of the movable contacts (4) and (5) is brought closer to the input and output plates (2), (3) making contact with the same with a similar force, in such a way that the movable contacts (4) and (5) seek the best support on the vertical segments (2'), (3'), adapting their position to achieve good contact on the same. This good adaptation is possible by the axle (8) being mounted with the possibility to slide with respect to the housings of the casing and, fundamentally, in that both contacts (4) and (5) are displaced with the same force.
The disconnector object of the invention, through the arrangement of the input and output plates (2) (3), the compact configuration of the operating mechanisms and the horizontal movement of the movable contacts (4) and (5), allows an disconnector of reduced dimensions in height to be obtained. This implies that, when making three-pole and four-pole assemblies in the vertical position, each of the disconnectors is at a distance, in height, which corresponds with the standard distance of the bus bars of low-voltage switchboards, with no need to use additional input bars. Obviously, in horizontal three-pole or four-pole arrangements, the different disconnectors corresponding to each phase can be mounted with the necessary spacing.
The disconnector is foreseen for the incorporation, when necessary, of a current transformer (17), that is, the disconnector is mounted in the factory and its casing is closed, without incorporating the current transformer (17), the latter being constituted as an optional module which can be coupled, with no need to open the casing of the disconnector and whose assembly, therefore, can be done by the user with no need for it to take place during the actual factory assembly of the disconnector. Thus, the disconnector provides its main functions of input to a low-voltage switchboard and physical separation of the power supply, to which can be added, optionally, the current transformer function.
In a word, the disconnector has a housing (18) for the introduction of the current transformer (17) which is mounted on the input plate (2), by sliding, the incorporation of a closing cover (19) being foreseen.
In addition, in the event of a failure in the current transformer (17), the faulty transformer can be easily removed and replaced with a new one, with the particularity that it is not necessary to dismantle any element of the disconnector. For this reason, it is only necessary to have spares of the current transformers and of the disconnectors which are identical to those that are used in applications that do not require the current transformer.
With the present disconnectors, it is necessary to have independent spares of disconnectors without current transformer and disconnectors with current transformer since to repair the current transformer it is necessary to dismantle the complete disconnector and open its casing.
The disconnector object of the invention also incorporates an auxiliary emergency input which allows an auxiliary supply of the low-voltage switchboard to be made through the actual base, it being possible to carry out this operation, in a safe way, with the disconnector open or closed. This auxiliary input is materialized in a emergency input plate (20), mounted in the lower part of the disconnector, in contact with the output plate (3), the emergency input plate (20) having a front elbow with the corresponding holes to make the required electric inputs. In the front part of the casing (1) there will be an access cover (21) for the auxiliary supply cables which allows the input to be made.
It has also been foreseen that the disconnector incorporate some voltage and current auxiliary outputs or circuits to feed auxiliary circuits. For this purpose, the disconnector incorporates a recess (22) in the upper part of the casing (1), for housing the terminal posts. This recess is independent of the main bus bars of the disconnector and is protected by means of a cover (23).
Thus, the disconnector object of the invention has the following functions:

The main functions of:
- Input to the low-voltage switchboard.
- Physical separation of the supply of the low-voltage switchboard.
- Auxiliary functions:
  - To maintain the degree of protection of the low-voltage switchboard.
  - Connection to ground of the bus-bar-arrangement of the low-voltage switchboard.
  - Housing for the current transformer.
  - Output for auxiliary circuits and measurement circuits.
  - Auxiliary, emergency, input to the low-voltage switchboard.

Claims

- Compact disconnector which comprises a casing (1) housing partially an input plate (2) and an output plate (3) whose ends are connected respectively to the supply and to the distribution bus bars in the low-voltage switchboard, and contacts (4) and (5) for coupling or uncoupling to the input (2) and output (3) plates, characterized in that the input (2) and output (3) plates are mounted inside the casing (1) in a horizontal position, one over the other, coming out to the exterior of the casing, through its rear part, for the connection to the supply and the distribution bus bars.
- Compact disconnector according to claim 1, characterized in that the input (2) and output (3) plates comprise, on their end housed inside the casing (1), individual vertical branches (2'), (3').
- Compact disconnector according to claim 1, characterized in that the contacts (4) and (5) are displaceable inside the casing with a linear movement, in a direction parallel to the input (2) and output (3) plates.
- Compact disconnector, according to claim 3, characterized in that the contacts (4) and (5) are displaced in opposing senses, being coupled respectively on the vertical branches (2') and (3') of the input (2) and output
(3) plates.
- Compact disconnector, according to claim 3, characterized by comprising means for displacement of the contacts (4) and (5) which comprise an eccentric (7), joined in an articulated manner to an axle (8) which is supported on its ends in individual housings, facing each other inside the casing (1), to allow the displacement of the axle (8) in the axial direction, the contact (5) being mounted in a fixed manner on the axle (8), whilst the contact (4) is mounted on the axle (8), through a support (9) and bushing (10), which allows the contact (4) to slide with respect to the axle (8), the contact (4) mentioned being attached to the casing (1) through a spring.
- Compact disconnector, according to claim 5, characterized by comprising means of external operation (6) which produce the displacement of the eccentric (7), the sliding of the axle (8) and the movement of the movable contacts (4) and (5).
- Compact disconnector, according to claim 6, characterized in that the operating element (6) is a lever operated externally and removable.
- Compact disconnector, according to claim 7, characterized in that the casing (1) incorporates at least one external slot (14) on the interior of which the operating element (6) slides.
- Compact disconnector, according to claim 8, characterized in that the cited lever (6) comprises ribs (13), intended to be lodged in channels (12) of the operating eccentric (7), in such a way that the tilting of the lever (6) causes the eccentric (7) to turn, the slot (14) of the casing (1) comprising, on its end points, individual holes (15) and (16) whose section corresponds with that of the ribs (13) of the lever (6) which allow the insertion and the extraction of the cited lever (6) only in the two end positions of the slot (14).
- Compact disconnector, according to claim 1, further comprising a housing, independent and isolated from the casing (1), for the insertion of a module for a current transformer (17), the cited housing being in the upper part of the casing (1), when the disconnector is mounted in the low-voltage switchboard.
- Compact disconnector, according to claim 10, characterized in that the cited housing for the current transformer comprises a guide rail (18) placed beside the casing (1), on which the current transformer (17) is mounted, by sliding, the cited housing being closed by means of a cover (19).
- Compact disconnector, according to claim 1, further comprising a terminal block (24), independent and isolated from the casing (1), for the input of auxiliary circuits, the cited terminal block being placed in the upper part of the casing (1) when the disconnector is mounted in the low-voltage switchboard.
- Compact disconnector, according to claim 1, further comprising channels (22), on the sides of the casing (1), for the housing of cables, the cited channels (22) being protected by a cover (23).
- Compact disconnector, according to claim 13, characterized in that the cables of the auxiliary circuits, from the current transformer or from a voltage pick-up, are housed in the channels of the casing (1) reaching the terminal block (24), the current cables running along one side of the casing
(1) and the voltage cables along the other side, said cables being protected by means of the cover (23).
- Compact disconnector, according to claim 9 characterized in that a vertical four-pole assembly, comprising four compact disconnectors as in any of the preceding claims is mounted in a "185 mm bus bar system" with no need of adapters or spacing pieces.
- Compact disconnector, according to claim 1 further comprising an emergency auxiliary input (20) which allows the low-voltage switchboard to be fed through the disconnector.