CN219998078U - Contactor interlocking device and interlocking contactor - Google Patents

Abstract

The utility model belongs to the technical field of piezoelectric devices, and discloses a contactor interlocking device and an interlocking contactor, wherein the interlocking device is used for connecting two contactors arranged at intervals along the X direction and comprises an interlocking mechanism, a supporting piece and a fixing piece; the interlocking mechanism is arranged between the two contactors, and the fixing piece is connected to the bottoms of the two contactors; the supporting piece comprises a supporting main body, the supporting main body is supported between the interlocking mechanism and the fixing piece and is provided with a limiting groove for inserting a lower boss of the interlocking mechanism, and the groove wall of the limiting groove can stop the lower boss in the Y direction; the supporting main body is clamped with the shell frame of the contactor through the first clamping hook and the second clamping hook. The interlocking mechanism can be limited in the directions X, Y, Z, the connection between the two contactors is realized jointly through the supporting piece and the fixing piece, the number of connecting screws between the fixing piece and the contactors can be reduced, the procedures of bending and reinforcing the fixing piece and the like are also reduced, and the production efficiency is improved.

Description

Contactor interlocking device and interlocking contactor

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a contactor interlocking device and an interlocking contactor.

Background

As shown in fig. 1, 2 and 3, the interlock contactor includes two contactor mechanisms 10 disposed at intervals in the X direction, and the two contactor mechanisms 10 are fixed together by the interlock device. The interlock includes an interlock assembly 20, a support 30, and a fixed cross member 40. The interlock assembly 20 is connected between the housing frames of the two contactor mechanisms 10 and serves to prevent simultaneous closing of the two contactor mechanisms 10, and when one of the contactor mechanisms 10 is closed, the interlock assembly 20 prevents the other contactor mechanism 10 from closing. The fixed cross beam 40 is connected to the bottoms of the two contactor mechanisms 10 through four screws 50, the upper end of the supporting piece 30 abuts against the interlocking component 20, and the lower end of the supporting piece abuts against the fixed cross beam 40 through a buckle.

The prior art has the following defects: the support 30 is supported between the interlock assembly 20 and the fixed cross member 40, and only plays a role of limiting the interlock assembly 20 in the vertical direction (Z direction), and has no connection relationship with the two contactor mechanisms 10, and the interlock assembly 20 between the two contactor mechanisms 10 may shift or be jammed during transportation or impact of a product, resulting in unreliable mechanical interlocking. The fixing between the two frames of the contactor mechanism 10 is mainly achieved by the fixing cross member 40, and therefore, the fixing cross member 40 is set longer, see fig. 1, the fixing cross member 40 extends from the leftmost side of the frame of the left side contact contactor mechanism 10 to the rightmost side of the frame of the right side contact contactor mechanism 10, so that more screws 50 can be arranged to ensure connection stability, and in addition, both sides of the fixing cross member 40 are bent to increase the strength thereof, the processes of screwing more screws 50, bending the fixing cross member 40 and the like certainly increase the workload when assembling the interlocking contactor product, and the production efficiency is lowered.

Accordingly, there is a need for a contactor interlock device and an interlock contactor that solve the above problems.

Disclosure of Invention

The utility model aims to provide a contactor interlocking device and an interlocking contactor, which can improve the stability of an interlocking mechanism, avoid the displacement and clamping stagnation of the interlocking mechanism and improve the assembly efficiency of the interlocking contactor.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in one aspect, a contactor interlocking device is provided, and is used for connecting two adjacent contactors, wherein the two contactors are arranged at intervals along an X direction, and the contactor interlocking device comprises an interlocking mechanism, a supporting piece and a fixing piece;

the interlocking mechanism is arranged between the two contactors, and the fixing piece is connected to the bottoms of the two contactors;

the support piece comprises a support main body, the support main body is supported between the interlocking mechanism and the fixing piece, a limiting groove is formed in the support main body, a lower boss of the interlocking mechanism is inserted into the limiting groove, and the groove wall of the limiting groove is used for stopping the lower boss in the Y direction; the shell frame of the contactor is provided with a second clamping hook, and the first clamping hook is clamped with the corresponding second clamping hook.

As the preferable scheme of the contactor interlocking device provided by the utility model, two opposite sides of the supporting main body are respectively provided with two first hooks which are spaced and opposite, a first clamping channel is formed between the two first hooks, and each first hook comprises a first boss extending along the Z direction and a first hook clamping part protruding on the first boss;

the second clamping hook comprises a second boss extending along the Z direction, second clamping parts are convexly arranged on two opposite sides of the second boss along the Y direction, and second clamping channels are arranged on two sides of the second clamping hook on the shell frame of the contactor;

the first clamping hook can be clamped into the second clamping channel along the Z direction, the second clamping hook can be clamped into the first clamping channel along the Z direction, and the first clamping hook part is clamped with the second clamping hook part.

As the preferable scheme of the contactor interlocking device provided by the utility model, at least one first limiting rib is convexly arranged on the inner wall of the first clamping channel, and the first limiting rib is abutted against the second boss;

and/or, at least one second limiting rib is arranged on the second boss, and the second limiting rib abuts against the inner wall of the first clamping channel.

As the preferable scheme of the contactor interlocking device provided by the utility model, the top of the supporting main body is provided with the first guiding end, and the cross section area of the first guiding end is gradually reduced from bottom to top.

As the preferable scheme of the contactor interlocking device provided by the utility model, the top of the first clamping hook is provided with the second guiding end, and the cross section area of the second guiding end is gradually reduced from bottom to top.

As the preferable scheme of the interlocking device of the contactor, a shell frame of the contactor is provided with a positioning protrusion, the fixing piece is provided with a positioning hole, and the positioning protrusion is inserted into the positioning hole;

the fixing piece is connected with the shell frame of the contactor through a threaded piece.

As the preferable scheme of the contactor interlocking device provided by the utility model, one side of the fixing piece, which is opposite to the contactor, is convexly provided with the reinforcing convex hull.

As a preferred embodiment of the contactor interlocking device provided by the present utility model, a gasket is selectively provided between the support body and the fixing member.

As the preferable scheme of the contactor interlocking device provided by the utility model, the gasket is provided with the limiting boss, the supporting main body is provided with the limiting cavity, and the limiting boss is inserted into the limiting cavity.

As the preferable scheme of the contactor interlocking device provided by the utility model, the supporting piece is of a hollow structure, and the inner cavity of the supporting piece is provided with the reinforcing ribs.

In another aspect, there is provided an interlocking contactor comprising two contactors arranged at intervals along an X-direction, and a contactor interlocking device as described above, wherein the two contactors are connected by the contactor interlocking device.

The utility model has the beneficial effects that:

according to the contactor interlocking device and the interlocking contactor, the supporting main body of the supporting piece is supported between the interlocking mechanism and the fixing piece, the interlocking mechanism can be limited in the Z direction, and the limiting groove arranged on the supporting main body can limit the interlocking mechanism in the Y direction, so that the interlocking mechanism can be limited in the X, Y, Z directions, the stability of the interlocking mechanism is improved, the interlocking mechanism is prevented from shifting and clamping stagnation in the process of transporting or being impacted and the like, and the reliability of the interlocking mechanism is improved. In addition, the support piece is clamped with the second clamping hook on the shell frame of the contactor through the first clamping hook to fix two contactors, namely, the support piece bears a part of the effect of fixing the contactors, so that the burden of the fixing piece can be lightened, the mechanical connection between the two contactors is realized jointly through the support piece and the fixing piece, compared with the prior art, the number of connecting screws between the fixing piece and the contactors can be reduced, the procedures of bending and reinforcing the fixing piece and the like are reduced, the fixing requirement can be met, the assembly workload is reduced, and the production efficiency of the interlocking contactors is improved.

Drawings

FIG. 1 is an isometric view of an interlock contactor provided in the prior art;

FIG. 2 is a bottom view of the interlocking contacts provided by the prior art;

FIG. 3 is a side view of an interlocking contactor provided by the prior art (one of the contactors is hidden);

FIG. 4 is an overall isometric view of an interlock contactor provided in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic illustration of the connection of an interlock mechanism to a contactor according to an embodiment of the present utility model;

FIG. 6 is a side view of an interlock contactor (concealing one of the contactors) provided by embodiments of the present utility model;

FIG. 7 is a bottom view of an interlock contactor provided in accordance with an embodiment of the present utility model;

FIG. 8 is an enlarged view of a portion of FIG. 7 at A;

FIG. 9 is a first view of a support member provided in accordance with an embodiment of the present utility model;

FIG. 10 is a second view of a support member provided in accordance with an embodiment of the present utility model;

FIG. 11 is a schematic illustration of a gasket provided in accordance with an embodiment of the present utility model;

FIG. 12 is a schematic view of a fastener provided in accordance with an embodiment of the present utility model;

fig. 13 is a third view of a support member provided in an embodiment of the present utility model.

In fig. 1 to 3:

10. a contactor mechanism; 20. an interlock assembly; 30. a support; 40. fixing the cross beam; 50. and (5) a screw.

Fig. 4 to 13:

1. an interlocking mechanism; 2. a support member; 3. a fixing member; 4. a screw; 5. a gasket;

11. a first limiting surface; 12. a lower boss; 13. the second limiting surface;

21. a support body; 22. a first hook; 23. the first clamping channel; 24. the first limit rib; 25. reinforcing ribs;

211. a limit groove; 212. a first guide end; 213. a spacing cavity;

221. a first boss; 222. a first hooking part; 223. a second guide end;

31. positioning holes; 32. reinforcing the convex hull; 33. a fixing hole;

51. a limit boss;

100. a contactor;

101. a housing; 102. a second hook; 103. the second clamping channel; 104. positioning the bulge;

1021. a second boss; 1022. and a second hooking part.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 4, the present embodiment provides an interlocking contactor, which includes two contactors 100 arranged at intervals along the X direction and a contactor interlocking device, and the two contactors 100 are connected together by the contactor interlocking device.

Referring to fig. 4 and 6, the contactor interlocking device provided in this embodiment includes an interlocking mechanism 1, a support member 2, and a fixing member 3. The interlock mechanism 1 is provided between the two contactors 100 for preventing the two contactors 100 from being closed at the same time, and when one contactor 100 is closed, the interlock mechanism 1 can prevent the other contactor 100 from being closed. The fixing member 3 is connected to the bottoms of the two contactors 100, specifically, fixedly connected to the bottom of the housing 101 of the contactor 100 through a screw member 4, and the screw member 4 may be a screw.

Referring to fig. 5, 7 and 8, the supporting member 2 includes a supporting body 21, the supporting body 21 is supported between the interlocking mechanism 1 and the fixing member 3, a limiting groove 211 is provided on the supporting body 21, the lower boss 12 of the interlocking mechanism 1 is inserted into the limiting groove 211, and a groove wall of the limiting groove 211 is used for stopping the lower boss 12 in the Y direction. The opposite sides of the supporting body 21 are provided with first hooks 22, the housing 101 of the contactor 100 is provided with second hooks 102, and the first hooks 22 are engaged with the corresponding second hooks 102.

The support main body 21 of the support member 2 is supported between the interlocking mechanism 1 and the fixing member 3, the interlocking mechanism 1 can be limited in the Z direction, and the limiting groove 211 formed in the support main body 21 can limit the interlocking mechanism 1 in the Y direction, so that the interlocking mechanism 1 can be limited in the X, Y, Z directions, the stability of the interlocking mechanism 1 is improved, the interlocking contactor is prevented from shifting and jamming of the interlocking mechanism 1 in the process of transportation or collision and the like, and the reliability of the interlocking mechanism 1 is improved. In addition, the supporting member 2 is engaged with the second hook 102 on the shell frame 101 of the contactor 100 through the first hook 22, so as to fix two contactors 100, namely, the supporting member 2 bears a part of the function of fixing the contactors 100, so that the burden of the fixing member 3 can be lightened, the mechanical connection between the two contactors 100 is realized jointly through the supporting member 2 and the fixing member 3, compared with the prior art, the number of screws required between the fixing member 3 and the contactors 100 can be reduced, the procedures of bending and reinforcing the fixing member 3 and the like are also reduced, the fixing requirement can be met, the assembly workload is reduced, and the production efficiency of the interlocking contactors is improved.

As shown in fig. 8, in this embodiment, only two screws 4 (screws) are required to connect the fixing member 3 and the housing 101 of one of the contactors 100, respectively, so as to meet the fixing requirement between the two contactors 100.

Referring to fig. 5, the two sides of the lower boss 12 of the interlocking mechanism 1 are first limiting surfaces 11, and the first limiting surfaces 11 are used for abutting against the top surface of the supporting body 21, so that the supporting body 21 limits the interlocking mechanism 1 in the Z direction. The two sides of the lower boss 12 along the Y direction are second limiting surfaces 13, and the second limiting surfaces 13 are matched with the two groove walls of the limiting groove 211 along the Y direction, so that the supporting main body 21 limits the interlocking mechanism 1 along the Y direction.

As shown in fig. 8 and 9, two first hooks 22 are disposed on opposite sides of the support body 21, the two first hooks 22 are spaced apart and disposed opposite to each other along the Y direction, a first clamping channel 23 is formed between the two first hooks 22, and the first hooks 22 include a first boss 221 extending along the Z direction and a first hooking portion 222 protruding on the first boss 221. As shown in fig. 5 and 8, the second hook 102 includes a second boss 1021 extending along the Z direction, two opposite sides of the second boss 1021 along the Y direction are both provided with second hook portions 1022, and two sides of the second hook 102 on the housing 101 of the contactor 100 are both provided with second clamping channels 103.

When the support 2 is assembled, the support 2 is inserted between the two contactors 100 in the Z direction, and during this time, the first hook 22 is engaged in the second engaging channel 103 in the Z direction, and at the same time, the second hook 102 is engaged in the first engaging channel 23 in the Z direction, and the first hook 222 is engaged with the second hook 1022. When the top surface of the main body 21 to be supported is abutted against the first limiting surface 11 of the interlocking mechanism 1, the supporting piece 2 is inserted in place. The first hooking portion 222 and the second hooking portion 1022 also extend along the Z direction, and have a large enough contact area, so as to improve the connection stability between the support 2 and the housing 101 of the contactor 100.

It should be noted that the second hook 102 and the second clamping channel 103 are structures of the housing 101 of the contactor 100, and are used for hanging the contactor 100 at a certain position, as shown in fig. 4, two sides of the housing 101 along the X direction are provided with the second hook 102 and the second clamping channel 103, the second hooks 102 on one side of the two housing 101 close to each other are used for connecting with the supporting member 2, and the second hooks 102 on the other side far from each other are used for hanging.

Optionally, in this embodiment, referring to fig. 9 and fig. 10, at least one first limiting rib 24 (two exemplary) is protruding on the inner wall of the first clamping channel 23, and the first limiting rib 24 can abut against the outer wall surface of the second boss 1021, so that the connection between the support member 2 and the housing frame 101 after being inserted is more fastened. Further, the first limiting rib 24 extends along the Z direction, so that no large resistance is caused to the insertion of the support member 2, and meanwhile, the function of reinforcing the support member 2 can be achieved.

In another embodiment, at least one second limiting rib may be disposed on the second boss 1021, where the second limiting rib can abut against the inner wall of the first clamping channel 23, so that the connection between the support member 2 and the housing frame 101 after the insertion is more tight. The second stop bead preferably extends in the Z direction.

Alternatively, the first limiting rib 24 may be protruded on the inner wall of the first clamping channel 23, and the second limiting rib may be protruded on the second boss 1021.

Further, as shown in fig. 9, the top of the supporting body 21 is provided with a first guiding end 212, and the cross-sectional area of the first guiding end 212 gradually decreases from bottom to top, so as to provide a guiding effect for the supporting body 21 to enter between the two contactors 100. The top of the first hook 22 is provided with a second guiding end 223, and the cross-sectional area of the second guiding end 223 is gradually reduced from bottom to top, so that a guiding effect can be provided for the first hook 22 to enter the second clamping channel 103. The provision of the first guide end 212 and the second guide end 223 makes the assembly of the support member 2 easier and smoother.

Alternatively, referring to fig. 10, the support 2 is of hollow structure, and ribs 25 are provided in the inner cavity of the support 2. By the arrangement, the material consumption of the supporting piece 2 can be saved on the premise of ensuring the supporting strength of the supporting piece 2, and the cost is reduced.

As shown in fig. 8 and 12, a positioning protrusion 104 is provided on the housing 101 of the contactor 100, a positioning hole 31 is provided on the fixing member 3, and the positioning protrusion 104 is inserted into the positioning hole 31 to quickly position the mounting position of the fixing member 3, so that the fixing hole 33 on the fixing member 3 for threading the screw member 4 can be quickly aligned with the threaded hole on the housing 101, and the assembly efficiency is improved.

Further, the fixing hole 33 communicates with the positioning hole 31, and the width of the fixing hole 33 is smaller than the width of the positioning hole 31 to form a stepped surface at the connection of the fixing hole 33 and the positioning hole 31, the stepped surface cooperates with the positioning protrusion 104 on the housing 101 to maintain a gap between the two contactors 100 without excessively pressing the intermediate interlocking mechanism 1 and the support 2.

Referring to fig. 12, the fixing member 3 has a rectangular plate shape, and a reinforcing convex hull 32 is protruded from a side of the fixing member 3 facing away from the contactor 100. The reinforcing convex hull 32 extends along the length direction (X direction) of the fixing member 3, reducing deformation of the fixing member 3. Further, a reinforcing convex hull 32 is formed on the fixing member 3 on both sides of the positioning hole 31.

As shown in fig. 9 and 10, the support 2 is assembled on the three-stage contactor 100 with the specification shown in fig. 4, the bottom can be just abutted against the fixing member 3, so as to realize the Z-direction limit of the interlocking mechanism 1, if the support 2 is applied to the three-stage contactor 100 with a larger current level, a gap exists between the bottom of the support 2 and the bottom of the housing 101 due to the size of the housing 101 of the contactor 100 becoming larger, at this time, a gasket 5 (see fig. 11) can be arranged at the bottom of the support body 21, after the fixing member 3 is assembled, the gasket 5 is supported, and the gasket 5 compensates the gap between the support body 21 and the fixing member 3, so that the support body 21 can limit the interlocking mechanism 1 in the Z-direction.

Referring to fig. 11, a limiting boss 51 is provided on the pad 5, referring to fig. 10, a limiting cavity 213 is provided on the support body 21, and the limiting boss 51 is inserted into the limiting cavity 213, so that the pad 5 is ensured to be stable and not to move. In this embodiment, the supporting member 2 has a hollow structure with ribs 25 therein, and the limiting cavity 213 may be defined between two adjacent ribs 25.

If the support member 2 of the present embodiment is applied to the four or more stages of the contactor 100, the width of the support member 2 can be adaptively widened to fit the interval between the two contactors 100. Referring to fig. 13, which is a schematic view of the support member 2 between two four-stage contactors 100, the connection between the support member 2 and the housing frame 101 can be achieved by increasing the width compared to the support member 2 applied to the three-stage contactor 100.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. The contactor interlocking device is used for connecting two adjacent contactors (100), and the two contactors (100) are arranged at intervals along the X direction, and is characterized by comprising an interlocking mechanism (1), a supporting piece (2) and a fixing piece (3);

the interlocking mechanism (1) is arranged between the two contactors (100), and the fixing piece (3) is connected to the bottoms of the two contactors (100);

the support piece (2) comprises a support main body (21), the support main body (21) is supported between the interlocking mechanism (1) and the fixing piece (3), a limit groove (211) is formed in the support main body (21), a lower boss (12) of the interlocking mechanism (1) is inserted into the limit groove (211), and the groove wall of the limit groove (211) is used for stopping the lower boss (12) in the Y direction; the utility model discloses a contactor, including support main part (21), shell frame (101) of contactor (100), support main part (21) opposite both sides all are provided with first pothook (22), shell frame (101) of contactor (100) are provided with second pothook (102), first pothook (22) with corresponding second pothook (102) block.

2. The contactor interlock of claim 1 wherein,

two opposite sides of the supporting main body (21) are respectively provided with two first clamping hooks (22) which are spaced and opposite to each other, a first clamping channel (23) is formed between the two first clamping hooks (22), and the first clamping hooks (22) comprise first bosses (221) extending along the Z direction and first clamping hook parts (222) protruding on the first bosses (221);

the second clamping hook (102) comprises a second boss (1021) extending along the Z direction, second clamping hook parts (1022) are convexly arranged on two opposite sides of the second boss (1021) along the Y direction, and second clamping channels (103) are arranged on two sides of the second clamping hook (102) on the shell frame (101) of the contactor (100);

the first clamping hook (22) can be clamped into the second clamping channel (103) along the Z direction, the second clamping hook (102) can be clamped into the first clamping channel (23) along the Z direction, and the first clamping hook portion (222) is clamped with the second clamping hook portion (1022).

3. The contactor interlocking device according to claim 2, wherein at least one first limiting rib (24) is provided on an inner wall of the first clamping channel (23), and the first limiting rib (24) abuts against the second boss (1021);

and/or, at least one second limiting rib is arranged on the second boss (1021), and the second limiting rib is abutted against the inner wall of the first clamping channel (23).

4. The contactor interlock according to claim 2, wherein the top of the support body (21) is provided with a first guide end (212), the cross-sectional area of the first guide end (212) gradually decreasing from bottom to top.

5. The contactor interlock according to claim 2, wherein the top of the first hook (22) is provided with a second guide end (223), the cross-sectional area of the second guide end (223) gradually decreases from bottom to top.

6. The contactor interlocking device according to any one of claims 1 to 5, wherein a positioning protrusion (104) is provided on a housing (101) of the contactor (100), a positioning hole (31) is provided on the fixing member (3), and the positioning protrusion (104) is inserted into the positioning hole (31);

the fixing piece (3) is connected with the shell frame (101) of the contactor (100) through a screw (4).

7. The contactor interlock according to any of claims 1-5, characterized in that the side of the fixing element (3) facing away from the contactor (100) is convexly provided with a reinforcing bulge (32).

8. A contactor interlock according to any of claims 1-5, characterized in that a gasket (5) is optionally provided between the support body (21) and the fixture (3).

9. The contactor interlocking device according to claim 8, wherein a limit boss (51) is provided on the gasket (5), a limit cavity (213) is provided on the support body (21), and the limit boss (51) is inserted into the limit cavity (213).

10. The contactor interlock according to any of claims 1-5, characterized in that the support (2) is of hollow construction and that the support (2) is provided with reinforcing ribs (25) in its inner cavity.

11. Interlocking contactor, characterized by comprising two contactors (100) arranged at intervals along the X-direction, and a contactor interlock according to any of claims 1-10, by means of which two contactors (100) are connected.