Title of Invention	"SWITCH CONTACT DEVICE AND A METHOD OF CUTTING AN EROSION POINTER IN SUCH A DEVICE"
Abstract	The inventiui relates to a switch coniXXX arangment with a first moving switch control (XXX). with a second switch contact (3),. provided for the first switch contact and with an erosion display (15), for the switch contacts. The erosion display comprises an erosion pointer (1 6) and a display surface (17) or display edge (18). The display pointer fallows the movement of the first switch contact and, on closing the contacts, the only extends over the display surface or display edge when the value for the - erosion of the switch cortrols is less then a given XXX value. In order to be able to shorten the display pointer in the XXX condition with on a special tool to give a separation (20) from the display conface (17) or display edge. (18), The value of witch corresponds to the value of the maximum, permited erosion of lhe switch contacts (2, 3), at least one marking for the culling of the display pointer is provided, whereby the marking is separated from the display surface or display edge by the maximum permited erosion of the switch contacts

Title of Invention

"SWITCH CONTACT DEVICE AND A METHOD OF CUTTING AN EROSION POINTER IN SUCH A DEVICE"

Abstract

The inventiui relates to a switch coniXXX arangment with a first moving switch control (XXX). with a second switch contact (3),. provided for the first switch contact and with an erosion display (15), for the switch contacts. The erosion display comprises an erosion pointer (1 6) and a display surface (17) or display edge (18). The display pointer fallows the movement of the first switch contact and, on closing the contacts, the only extends over the display surface or display edge when the value for the - erosion of the switch cortrols is less then a given XXX value. In order to be able to shorten the display pointer in the XXX condition with on a special tool to give a separation (20) from the display conface (17) or display edge. (18), The value of witch corresponds to the value of the maximum, permited erosion of lhe switch contacts (2, 3), at least one marking for the culling of the display pointer is provided, whereby the marking is separated from the display surface or display edge by the maximum permited erosion of the switch contacts

Full Text	Switch contact arrangement with an erosion display for the switch contacts 5 The invention is in the area of electrical switches provided with a switch contact arrangement fitted with a first moving switch contact, and a .second switch contact provided for the first switch contact, and is intended for use in the design 10 and construction of an erosion display for the said switch contacts. In a known switch contact arrangement for a low-voltage circuit-breaker, the erosion display comprises an erosion 15 pointer and a display surface or display edge. The erosion pointer follows the movement of the first switch contact and, with the contacts closed, then extends beyond the display surface or display edge only when the value for the erosion of the switch contacts is less than a given maximum value 20 (Instruction Manual for Circuit-Breaker 3WN6, Siemens AG, Germany, 1998) . In this known switch contact arrangement, the moving switch contact has a contact holder and a plurality of contact levers supported on the contact holder by means of contact force springs. The metal erosion pointer is supported 25 on one of the contact levers and located in a hole drilled in the contact holder in the direction of force of the contact force spring. A recess in the contact holder serves as an inspection hole, one side of. which opens to the drill hole, such that the end of the erosion pointer facing away from the 30 contact lever only extends into the inspection aperture when there is a permitted amount of erosion on contact surfaces formed on the contact levers(contact members). If the value for the erosion on these contact surfaces is greater than the predefined maximum value, the erosion pointer no longer 2002P15023WOUS PCT/DE2003/002591 3 According to the invention, the term erosion pointer means that element which is clearly visible when it extends beyond the display surface or display edge and which can be shortened without great technical effort, for instance by cutting. Such 5 an element can have any kind of cross-section, such as polygonal, oval or round, and may also take the form of a stiff atrip or tape. This element may be supported on the moving switch contact, directly or via a connecting link, or may be fastened to the moving switch contact, or designed as 10 an integral component of the moving switch contact. In a preferred embodiment of the innovative switch contact arrangement it is envisaged that the marking, in particular that for guiding the cutting edge of a tool, will take the 15 form of a.cutting surface or cutting edge. Using such a design the erosion pointer can be shortened accurately on the cutting edge or cutting surface without the need for any additional mark on the erosion pointer itself. 20 So that it will be easier to shorten the erosion pointer, it is envisaged that the erosion pointer will be made of plastic. To provide support for the erosion pointer during cutting, and as a simple means of avoiding damage to the erosion pointer 25 during shortening, a supporting surface can be provided running parallel to the erosion pointer. In particular the low-voltage circuit-breaker known from the aforementioned instruction manual can also be provided with 30 the innovative switch contact arrangement because the marking is formed by a first side of a second recess which is open to the first recess. In this case the supporting surface can be formed from a section of the drill hole open to the floor of the first recess. The second recess can form lateral guide surfaces for the tool used for cutting. In an innovative switch contact arrangement built into an electrical switch, the erosion pointer can easily be adapted 5 to the dimensional tolerances of the innovative switch contact arrangement by cutting the pointer as necessary. For this purpose an erosion pointer that extends beyond the marking when the switch contacts are closed merely has to be provided for the innovative switch contact arrangement and then cut off 10 at the marking. An ordinary tool such as a slotted screwdriver can be used for cutting. A typical embodiment of a switch contact arrangement for an electrical switch in the form of a low-voltage circuit-breaker 15 with the innovative erosion display is shown in Figures 1 to 7. These are as follows: Figure 1 is a diagram of a low-voltage circuit-breaker with a switch contact arrangement comprising an erosion display for 20 switch contacts provided with contact surfaces, Figure 2 shows the switch contact arrangement according to Figure 1 as it first appears in its unused condition before the erosion pointer has been shortened. Figure 3 shows the switch contact arrangement in its unused 25 condition when the erosion pointer is being cut, Figure 4 shows the switch contact arrangement in the condition of maximum permitted erosion of the contact surfaces on the switch contacts, Figure 5 is a sectional view of a first section of the switch 30 contact arrangement along the line A-A in Figure 3 and Figures 6 and 7 are a top view of a second section of the switch contact arrangement with the erosion pointer still not shortened as in Figure 2, and with the erosion pointer cut as 2002P15023WOUS PCT/DE2003/002591 5 in Figure 3. The low-voltage circuit-breaker according to Figure 1 has a housing 1 containing a switch contact arrangement (consisting 5 of a moving switch contact 2 and a static contact 31, an arc quenching chamber 4 and a drive mechanism 6. The said drive mechanism 6 is used in this case to activate the moving switch contact 2, which has a plurality of contact levers 8 supported in a pivoting contact holder 7 and arranged parallel to each 10 other (only one contact lever is visible in the figure). The contact levers 8 are pivotally attached in a known way to the contact holder 7 by a joint bolt and pre-tensioned by two contact force springs 9 each. Flexible conductors 10 serve to connect the contact levers 8 to a lower connecting bar 11. The 15 static switch contact 3 associated with the moving switch contact 2 is connected to an upper connecting bar 12. The switch contacts 2, 3 are provided with contact surfaces 13, 14 (contact members) in the form of superimposed bodies made from a very special material, and consisting of sintered materials 20 containing Ni, W and other special metals. Since these are comparatively expensive they are applied in relatively thin layers. The contact surfaces 13, 14 are still quite thick when the switch contact arrangement is in its unused condition, and its material is eroded by an electric arc. It is thus 25 necessary to ensure that the contact surfaces are melted away fully. Therefore a certain value is specified as the maximum permitted erosion value, and the switch contact arrangement includes a display device 15 to display the current erosion value. When a new switch contact arrangement is fitted on the 30 electrical switch operator's premises it is desirable that the erosion display can be set to the value specified for the maximum permitted erosion without a special tool. For this purpose the erosion display according to Figure 2 has 2002P15023WOUS PCT/DE2003/002591 6 a plastic erosion pointer 16, together with a display surface 17 or display edge 18 aligned at a first level, the erosion pointer 16 needing to be shortened, with the switch contacts 2, 3 closed, at a marking of the switch contact arrangement, 5 said marking being in the form of a cutting surface 19. This cutting surface 19 is separated from the display surface 17 by a distance 20, the value of which corresponds to the specified maximum erosion value, 10 The newly inserted erosion pointer is supported on one of the contact levers 8. For this purpose the said pointer has a collar 21 at its end pointing toward the contact lever. This collar 21 fits into a pocket 22 in the contact lever. Between the collar and the far end 23 of a socket 24 for one of the 15 contact force springs 9, the contact force spring 9 through which the erosion pointer 16 extends is pre-tensioned, holding the erosion pointer against the contact lever 8 in such a way that the pointer follows the movement of the contact lever. The far end 23 of the socket 24 for the contact force spring 20 is the starting point of a drill hole 25 which extends through the contact holder 7 and is open both to a first side of a first recess 27 forming the display surface 17 and to the floor 35 of the first recess 27. This drill hole 2b serves as a guide for the erosion pointer 16. The value for the width of 25 the first recess 27 in the direction in which the erosion pointer 16 moves is the same as the value of the distance 20, being the maximum permitted erosion value. On the side 28 which points away from the contact holder the drill hole is open to a first side of a second recess 30 which is also 30 accessible from above. With the switch contacts 2, 3 closed, a new. erosion pointer 16 extends beyond the first side of the second recess 30 used as the cutting surface 19 (cf. also Figure 6). 2002P15023WOUS PCT/DE2003/002591 7 According to Figure 3, a slotted screwdriver 31 with its tapered end acting as a cutting edge 32 is pushed sharply downward onto the cutting surface 19 in order to cut the erosion pointer 16. For this purpose the side surfaces 33, 34 5 (cf. Figure 6) of the second recess 30 act as guide surfaces for the screwdriver 31. According to Figure 5 a section of the drill hole open to the floor 35 of the first recess 27 forms a supporting surface 36 10 for the erosion pointer 16 during cutting. The floor 37 of the second recess is somewhat deeper, so that a part 38 (cf. Figures 3 and 6) of the erosion pointer 16 projecting beyond the cutting surface 19 can be cut completely. Other tools may also be used to remove the said part 38 by cutting, filing or 15 some other means. According to Figures 3 and 7, the end of the erosion pointer 16 is level with the cutting surface 19 after cutting, so that when the switch contact arrangement is in its unused condition 20 said pointer exactly indicates the maximum permitted erosion value when viewed in relation to the display surface 17. According to Figure 4, the end of the erosion pointer.16 is level with the display surface 17 and can therefore no longer 25 be seen by an observer from above when the contact surfaces 13, 14 of the switch contacts 2, 3 have been burned away by the predefined maximum permitted value and the switch contact arrangement needs to be renewed. 30 2002P15023WOUS PCT/DE2003/002591 8 Claims 1. Switch contact arrangement with a first moving switch contact (2), with a second switch contact (13), provided for 5 the first switch contact, and with an erosion display (15) for the switch contacts, - in which the erosion display comprises an erosion pointer (16) and a display surface (17) or display edge{18}, - in which the erosion pointer follows the movement of the 10 first switch contact and, with the contacts closed, then extends beyond the display surface or display edge only when the value for the erosion of the switch contacts is less than a given maximum value, characterized in that 15 - at least one marking for the cutting of the erosion pointer is provided, - whereby the marking is separated from the display surface or display edge by the maximum permitted erosion of the switch contacts. 20 2. Switch contact arrangement according to Claim 1, characterized in that the marking, in particular that for guiding the cutting edge (32) of a tool, takes the form of a cutting surface 25 (195 or cutting edge. 3. Switch contact arrangement according to one of the Claims 1 or 2, characterized in that 30 the erosion pointer {16} is made from plastic. 4. Switch contact arrangement according to one of the Claims 1 to 3, characterized in that 2002P15023WOUS PCT/DE2003/O02591 9 a supporting surface (36) parallel to the erosion pointer (16) is provided in order to support the erosion pointer during cutting. 5 5. Switch contact arrangement according to one of the Claims 1 to 4 - in which the moving switch contact (2) has a contact holder (7) and at least one contact lever (8) supported on the contact holder by means of a contact force spring 10 (9) and - in which the erosion pointer (16) of the erosion display (15) is free to slide in a drill hole (25) which acts as a guide in the contact holder, - such that the display surface (17) or display edge (18) 15 is formed by a first side, open to the drill hole (25), of a first recess (27) in the contact holder, characterized in that the marking is formed by a first side of a second recess (30) which is open to the first recess (27). 20 6. Switch contact arrangement according to Claim 5, characterized in that the supporting surface (36) is formed by at least one section of the drill hole (25), said section being open 25 to the floor (35) of the first recess (27). 7.Switch contact arrangement according to one of the Claims 5 or 6, characterized in that 30 the second recess (30) forms lateral guide surfaces (33, 34) for the tool. 8. Method for cutting an erosion pointer in a switch contact arrangement according to one of the Claims 1 to 7, 2002P15023WOUS PCT/DE2003/002591 10 characterized in that - an erosion pointer (16) which extends beyond the marking when the switch contacts (2, 3) are closed is provided and 5 - the erosion pointer is cut at the marking. 9. Method for cutting an erosion pointer according to Claim 8 characterized in that a slotted screwdriver (31) is used as a tool for cutting. 10 The inventiui relates to a switch coniXXX arangment with a first moving switch control (XXX). with a second switch contact (3),. provided for the first switch contact and with an erosion display (15), for the switch contacts. The erosion display comprises an erosion pointer (1 6) and a display surface (17) or display edge (18). The display pointer fallows the movement of the first switch contact and, on closing the contacts, the only extends over the display surface or display edge when the value for the - erosion of the switch cortrols is less then a given XXX value. In order to be able to shorten the display pointer in the XXX condition with on a special tool to give a separation (20) from the display conface (17) or display edge. (18), The value of witch corresponds to the value of the maximum, permited erosion of lhe switch contacts (2, 3), at least one marking for the culling of the display pointer is provided, whereby the marking is separated from the display surface or display edge by the maximum permited erosion of the switch contacts

Full Text

Switch contact arrangement with an erosion display for the
switch contacts
5
The invention is in the area of electrical switches provided
with a switch contact arrangement fitted with a first moving
switch contact, and a .second switch contact provided for the
first switch contact, and is intended for use in the design
10 and construction of an erosion display for the said switch
contacts.
In a known switch contact arrangement for a low-voltage
circuit-breaker, the erosion display comprises an erosion
15 pointer and a display surface or display edge. The erosion
pointer follows the movement of the first switch contact and,
with the contacts closed, then extends beyond the display
surface or display edge only when the value for the erosion of
the switch contacts is less than a given maximum value
20 (Instruction Manual for Circuit-Breaker 3WN6, Siemens AG,
Germany, 1998) . In this known switch contact arrangement, the
moving switch contact has a contact holder and a plurality of
contact levers supported on the contact holder by means of
contact force springs. The metal erosion pointer is supported
25 on one of the contact levers and located in a hole drilled in
the contact holder in the direction of force of the contact
force spring. A recess in the contact holder serves as an
inspection hole, one side of. which opens to the drill hole,
such that the end of the erosion pointer facing away from the
30 contact lever only extends into the inspection aperture when
there is a permitted amount of erosion on contact surfaces
formed on the contact levers(contact members). If the value
for the erosion on these contact surfaces is greater than the
predefined maximum value, the erosion pointer no longer

2002P15023WOUS PCT/DE2003/002591
3
According to the invention, the term erosion pointer means
that element which is clearly visible when it extends beyond
the display surface or display edge and which can be shortened
without great technical effort, for instance by cutting. Such
5 an element can have any kind of cross-section, such as
polygonal, oval or round, and may also take the form of a
stiff atrip or tape. This element may be supported on the
moving switch contact, directly or via a connecting link, or
may be fastened to the moving switch contact, or designed as
10 an integral component of the moving switch contact.
In a preferred embodiment of the innovative switch contact
arrangement it is envisaged that the marking, in particular
that for guiding the cutting edge of a tool, will take the
15 form of a.cutting surface or cutting edge. Using such a design
the erosion pointer can be shortened accurately on the cutting
edge or cutting surface without the need for any additional
mark on the erosion pointer itself.
20 So that it will be easier to shorten the erosion pointer, it
is envisaged that the erosion pointer will be made of plastic.
To provide support for the erosion pointer during cutting, and
as a simple means of avoiding damage to the erosion pointer
25 during shortening, a supporting surface can be provided
running parallel to the erosion pointer.
In particular the low-voltage circuit-breaker known from the
aforementioned instruction manual can also be provided with
30 the innovative switch contact arrangement because the marking
is formed by a first side of a second recess which is open to
the first recess. In this case the supporting surface can be
formed from a section of the drill hole open to the floor of
the first recess. The second recess can form lateral guide

surfaces for the tool used for cutting.
In an innovative switch contact arrangement built into an
electrical switch, the erosion pointer can easily be adapted
5 to the dimensional tolerances of the innovative switch contact
arrangement by cutting the pointer as necessary. For this
purpose an erosion pointer that extends beyond the marking
when the switch contacts are closed merely has to be provided
for the innovative switch contact arrangement and then cut off
10 at the marking. An ordinary tool such as a slotted screwdriver
can be used for cutting.
A typical embodiment of a switch contact arrangement for an
electrical switch in the form of a low-voltage circuit-breaker
15 with the innovative erosion display is shown in Figures 1 to
7. These are as follows:
Figure 1 is a diagram of a low-voltage circuit-breaker with a
switch contact arrangement comprising an erosion display for
20 switch contacts provided with contact surfaces,
Figure 2 shows the switch contact arrangement according to
Figure 1 as it first appears in its unused condition before
the erosion pointer has been shortened.
Figure 3 shows the switch contact arrangement in its unused
25 condition when the erosion pointer is being cut,
Figure 4 shows the switch contact arrangement in the condition
of maximum permitted erosion of the contact surfaces on the
switch contacts,
Figure 5 is a sectional view of a first section of the switch
30 contact arrangement along the line A-A in Figure 3
and
Figures 6 and 7 are a top view of a second section of the
switch contact arrangement with the erosion pointer still not
shortened as in Figure 2, and with the erosion pointer cut as

2002P15023WOUS PCT/DE2003/002591
5
in Figure 3.
The low-voltage circuit-breaker according to Figure 1 has a
housing 1 containing a switch contact arrangement (consisting
5 of a moving switch contact 2 and a static contact 31, an arc
quenching chamber 4 and a drive mechanism 6. The said drive
mechanism 6 is used in this case to activate the moving switch
contact 2, which has a plurality of contact levers 8 supported
in a pivoting contact holder 7 and arranged parallel to each
10 other (only one contact lever is visible in the figure). The
contact levers 8 are pivotally attached in a known way to the
contact holder 7 by a joint bolt and pre-tensioned by two
contact force springs 9 each. Flexible conductors 10 serve to
connect the contact levers 8 to a lower connecting bar 11. The
15 static switch contact 3 associated with the moving switch
contact 2 is connected to an upper connecting bar 12. The
switch contacts 2, 3 are provided with contact surfaces 13, 14
(contact members) in the form of superimposed bodies made from
a very special material, and consisting of sintered materials
20 containing Ni, W and other special metals. Since these are
comparatively expensive they are applied in relatively thin
layers. The contact surfaces 13, 14 are still quite thick when
the switch contact arrangement is in its unused condition, and
its material is eroded by an electric arc. It is thus
25 necessary to ensure that the contact surfaces are melted away
fully. Therefore a certain value is specified as the maximum
permitted erosion value, and the switch contact arrangement
includes a display device 15 to display the current erosion
value. When a new switch contact arrangement is fitted on the
30 electrical switch operator's premises it is desirable that the
erosion display can be set to the value specified for the
maximum permitted erosion without a special tool.
For this purpose the erosion display according to Figure 2 has

2002P15023WOUS PCT/DE2003/002591
6
a plastic erosion pointer 16, together with a display surface
17 or display edge 18 aligned at a first level, the erosion
pointer 16 needing to be shortened, with the switch contacts
2, 3 closed, at a marking of the switch contact arrangement,
5 said marking being in the form of a cutting surface 19. This
cutting surface 19 is separated from the display surface 17 by
a distance 20, the value of which corresponds to the specified
maximum erosion value,
10 The newly inserted erosion pointer is supported on one of the
contact levers 8. For this purpose the said pointer has a
collar 21 at its end pointing toward the contact lever. This
collar 21 fits into a pocket 22 in the contact lever. Between
the collar and the far end 23 of a socket 24 for one of the
15 contact force springs 9, the contact force spring 9 through
which the erosion pointer 16 extends is pre-tensioned, holding
the erosion pointer against the contact lever 8 in such a way
that the pointer follows the movement of the contact lever.
The far end 23 of the socket 24 for the contact force spring
20 is the starting point of a drill hole 25 which extends through
the contact holder 7 and is open both to a first side of a
first recess 27 forming the display surface 17 and to the
floor 35 of the first recess 27. This drill hole 2b serves as
a guide for the erosion pointer 16. The value for the width of
25 the first recess 27 in the direction in which the erosion
pointer 16 moves is the same as the value of the distance 20,
being the maximum permitted erosion value. On the side 28
which points away from the contact holder the drill hole is
open to a first side of a second recess 30 which is also
30 accessible from above. With the switch contacts 2, 3 closed, a
new. erosion pointer 16 extends beyond the first side of the
second recess 30 used as the cutting surface 19 (cf. also
Figure 6).

2002P15023WOUS PCT/DE2003/002591
7
According to Figure 3, a slotted screwdriver 31 with its
tapered end acting as a cutting edge 32 is pushed sharply
downward onto the cutting surface 19 in order to cut the
erosion pointer 16. For this purpose the side surfaces 33, 34
5 (cf. Figure 6) of the second recess 30 act as guide surfaces
for the screwdriver 31.
According to Figure 5 a section of the drill hole open to the
floor 35 of the first recess 27 forms a supporting surface 36
10 for the erosion pointer 16 during cutting. The floor 37 of the
second recess is somewhat deeper, so that a part 38 (cf.
Figures 3 and 6) of the erosion pointer 16 projecting beyond
the cutting surface 19 can be cut completely. Other tools may
also be used to remove the said part 38 by cutting, filing or
15 some other means.
According to Figures 3 and 7, the end of the erosion pointer
16 is level with the cutting surface 19 after cutting, so that
when the switch contact arrangement is in its unused condition
20 said pointer exactly indicates the maximum permitted erosion
value when viewed in relation to the display surface 17.
According to Figure 4, the end of the erosion pointer.16 is
level with the display surface 17 and can therefore no longer
25 be seen by an observer from above when the contact surfaces
13, 14 of the switch contacts 2, 3 have been burned away by
the predefined maximum permitted value and the switch contact
arrangement needs to be renewed.
30

2002P15023WOUS PCT/DE2003/002591
8
Claims
1. Switch contact arrangement with a first moving switch
contact (2), with a second switch contact (13), provided for
5 the first switch contact, and with an erosion display (15)
for the switch contacts,
- in which the erosion display comprises an erosion pointer
(16) and a display surface (17) or display edge{18},
- in which the erosion pointer follows the movement of the
10 first switch contact and, with the contacts closed, then
extends beyond the display surface or display edge only
when the value for the erosion of the switch contacts is
less than a given maximum value,
characterized in that
15 - at least one marking for the cutting of the erosion
pointer is provided,
- whereby the marking is separated from the display surface
or display edge by the maximum permitted erosion of the
switch contacts.
20
2. Switch contact arrangement according to Claim 1,
characterized in that
the marking, in particular that for guiding the cutting
edge (32) of a tool, takes the form of a cutting surface
25 (195 or cutting edge.
3. Switch contact arrangement according to one of the Claims 1
or 2,
characterized in that
30 the erosion pointer {16} is made from plastic.
4. Switch contact arrangement according to one of the Claims 1
to 3,
characterized in that

2002P15023WOUS PCT/DE2003/O02591
9
a supporting surface (36) parallel to the erosion pointer
(16) is provided in order to support the erosion pointer
during cutting.
5 5. Switch contact arrangement according to one of the Claims 1
to 4
- in which the moving switch contact (2) has a contact
holder (7) and at least one contact lever (8) supported
on the contact holder by means of a contact force spring
10 (9) and
- in which the erosion pointer (16) of the erosion display
(15) is free to slide in a drill hole (25) which acts as
a guide in the contact holder,
- such that the display surface (17) or display edge (18)
15 is formed by a first side, open to the drill hole (25),
of a first recess (27) in the contact holder,
characterized in that
the marking is formed by a first side of a second recess
(30) which is open to the first recess (27).
20
6. Switch contact arrangement according to Claim 5,
characterized in that
the supporting surface (36) is formed by at least one
section of the drill hole (25), said section being open
25 to the floor (35) of the first recess (27).
7.Switch contact arrangement according to one of the Claims 5
or 6,
characterized in that
30 the second recess (30) forms lateral guide surfaces
(33, 34) for the tool.
8. Method for cutting an erosion pointer in a switch contact
arrangement according to one of the Claims 1 to 7,

2002P15023WOUS PCT/DE2003/002591
10
characterized in that
- an erosion pointer (16) which extends beyond the marking
when the switch contacts (2, 3) are closed is provided
and
5 - the erosion pointer is cut at the marking.
9. Method for cutting an erosion pointer according to Claim 8
characterized in that
a slotted screwdriver (31) is used as a tool for cutting.
10

The inventiui relates to a switch coniXXX arangment with a first moving switch control (XXX). with a second switch
contact (3),. provided for the first switch contact and with an erosion display (15), for the switch contacts. The erosion display
comprises an erosion pointer (1 6) and a display surface (17) or display edge (18). The display pointer fallows the movement of the
first switch contact and, on closing the contacts, the only extends over the display surface or display edge when the value for the
- erosion of the switch cortrols is less then a given XXX value. In order to be able to shorten the display pointer in the XXX
condition with on a special tool to give a separation (20) from the display conface (17) or display edge. (18), The value of witch
corresponds to the value of the maximum, permited erosion of lhe switch contacts (2, 3), at least one marking for the culling of the
display pointer is provided, whereby the marking is separated from the display surface or display edge by the maximum permited
erosion of the switch contacts

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Patent Number

219908

Indian Patent Application Number

00617/KOLNP/2005

PG Journal Number

20/2008

Publication Date

16-May-2008

Grant Date

14-May-2008

Date of Filing

11-Apr-2005

Name of Patentee

SIEMENS AKTIENGESELLSCHAFT

Applicant Address

WITTELSBACHERPLATZ 2, 80333 MUNCHEN, GERMANY.

Inventors:

#	Inventor's Name	Inventor's Address
1	SCHMIDT, DETLEV	RICHARDSTR, 61, 12055 BERLIN, GERMANY
2	SEIDLER, GUNTER	STERNSTR. 11, 13359 BERLIN, GERMANY
3	THIEDE, INGO	FREGESTR. 76, 12159, BERLIN, GERMANY
4	TURKMEN, SEZAL	SCHUCKERTDAMM 334, 13629 BERLIN, GERMANY
5	WAJNBERG, ARTUR	ESSENER STR.26, 10555 BERLIN, GERMANY

PCT International Classification Number

H01H 1/00

PCT International Application Number

PCT/DE2003/002591

PCT International Filing date

2003-07-30

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102 43 835.8	2002-09-13	Germany