CN1722336B - Locking mechanism of two electric device fixing devices and electric device with the mechanism - Google Patents

Abstract

The invention relates to a locking mechanism of a fixing device for two electrical components. The two electrical components are installed on the same mounting frame. Each electrical component includes a rear plate fixed to the mounting frame, two connecting plates, and a front plate. and two side plates, the front plate is composed of the control device of the above-mentioned electrical devices, and the above-mentioned electrical devices are connected to each other, one of the two electrical devices is called the first device, and the other is called the second device, and the first device is located at same side. This mechanism is characterized in that the above-mentioned fixing device comprises: a sliding part movable between the rest position and the fixed position of the two parts D, B, in the above-mentioned wings and in the housing of the second part D, the above-mentioned sliding part Reversible fastening mechanisms that are reversibly fastened in the above-mentioned fixed positions, latches that move between the rest position and the locked position of the fixing device in the above-mentioned fixed positions, and so-called irreversible fastening mechanisms, which can Said latch is irreversibly secured in said locked position.

Description

Locking mechanism of two electric device fixing devices and electric device with the mechanism

technical field

The present invention relates to a locking mechanism for two electrical device fixing devices, the two electrical devices are mounted on the same mounting frame and arranged in a roughly parallelepiped-shaped casing, each electrical device includes a locking mechanism fixed to the mounting frame The rear board, two connecting boards, a front board and two side boards, the front board includes the control device of the electrical device, the electrical devices are connected to each other, one of the two electrical devices is called the first device, and the other One is called the second device, which is on the same side as the first device. Said first part is constituted by a part forming a wing comprising a first part extending from and towards the web of said first part and a second part movable towards the web of the second part.

Background technique

Several solutions are known for locking the differential unit to the circuit breaker to which it is connected. One solution is to finally connect the differential unit to the circuit breaker with a self-breaking screw at the fastening end. As far as this solution is concerned, the mounting of the differential unit on the circuit breaker requires the precise fixing of the aforementioned fastening means. When dismantling, the fastening device will be broken, and it will be dangerous if it is reused.

It is also known to use a screw cap for irreversibly fixing the load-side connection of the circuit breaker, ultimately preventing the electrical connection between the differential unit and the circuit breaker from being interrupted. In this solution, direct locking is performed by prohibiting other functions of the above-mentioned device, such as access to the breaker connector screw, which will cause forgetting to tighten the above-mentioned differential unit wires and hinder pre-tensioning during trial operation or maintenance.

It is also known to use cut wires for conventional sealing, allowing the differential unit to be disassembled from the associated circuit breaker. In this case, a sealing line is used which is not integrated with the assembly device. Also utilized in the scheme recorded in French patent FR2779269 is a button mechanism that locks a slide rack mounted on one of the electrical components. The mechanism consists of a button that drives a lever that operates with the aforementioned carriage. This solution has a number of components that make the system described above more complex.

Contents of the invention

Aiming at these defects, the present invention provides a solution, providing a locking mechanism of a fixing device, which can be fastened and connected, but will leave traces when it is intentionally disassembled, and it does not need to use any tools and is not fixed. Influenced by other functions of the device, it is integrated with the above-mentioned device, includes a small number of parts, and can be started after the installation test and connection test are completed.

For this purpose, the object of the present invention is to provide a locking mechanism of the above-mentioned type, which mechanism is characterized in that the above-mentioned fixing means comprise: The sliding part moving in the housing of the second device, the latch moving between the rest position and the locking position of the above-mentioned fixing device in the above-mentioned fixed position, and the so-called irreversible fastening mechanism, which can make the above-mentioned latch The lock is irreversibly fastened to said locked position.

According to a specific technical feature, the above-mentioned device comprises a reversible fastening mechanism for reversibly fastening the above-mentioned sliding part in the above-mentioned fixed position.

According to a particular embodiment, the above-mentioned sliding part is slidably mounted in translation between the two above-mentioned positions.

According to a particular technical feature, said sliding part comprises a rod and a gripping element, said rod being able to pass continuously through an opening called the first opening provided on the second part of said wing and provided on the housing of the second device , called the opening of the second opening.

According to another feature, said reversible fastening means comprise a protrusion formed on the rod of said slide, capable of cooperating with a groove behind a ramp provided on the wall delimiting said first opening, so as to To reversibly fix the sliding part at a fixed position.

According to another feature, said sliding portion has a substantially T-shaped cross-section, and said gripping member is formed by a flat portion capable of coming into contact with the outer surface of said wing in said fixed position.

According to another feature, said latch comprises a plate slidable along the outer surface of said wing housing between a first position in which said securing means is not locked and a second position in which In the above-mentioned second position, the above-mentioned plate cooperates with the grasping part of the above-mentioned sliding part, so as to lock the above-mentioned fixing device in a fixed position.

According to another feature, in the locked position, the irreversible fastening mechanism of the latch comprises a tab fixed in an opening provided in the wing housing and referred to as the third opening, which tab is connected by one end to The above-mentioned plate, and through the other end and an inclined surface cooperate to operate so as to irreversibly fix the above-mentioned latch in the above-mentioned locking position, and the above-mentioned inclined surface is formed on the side wall defining the above-mentioned third opening.

According to another feature, the aforementioned sheet is foldable substantially in a V-shape.

According to another feature, said latch comprises two branches extending from said plate perpendicular to the plane of the plate, said branches comprising at the ends elements snapped onto a part of said wing housing in order to enable said latch Reversibly stuck in rest position, irreversibly stuck in active position.

According to another embodiment of the present invention, the rod of the above-mentioned sliding part comprises two cutouts forming three grooves for cooperating with the flexible protrusions so as to fix the corresponding three grooves of the sliding part in the open position respectively In the reversible fixed position and the irreversible locking position, the above-mentioned protruding head is fixed on the wall defining the third opening of the above-mentioned wing, and the above-mentioned protruding head and the third groove constitute an irreversible locking mechanism.

According to another feature, starting from the end of the lever on the side where the device is located, the first slot corresponds to the open position, the second slot corresponds to the fixed position, and the third slot corresponds to the irreversible locked position.

According to another embodiment, the rod of said slider comprises a bolt extending approximately perpendicular to the axis of the rod, capable of cooperating with a fixed ramp on the wall in the third opening of said wing, so that when the slider and the bolt translate through Behind the first opening of the wing, the slider can be driven in rotation between a first position corresponding to the unsecured state of the device and a second position in which the slider The latch is irreversibly locked, and after the sliding part passes the slope, the bolt is located on the other side of the slope.

According to another feature, the rod of the slider includes a boss cooperating with a part of the wall of the first opening so as to be able to form an obstacle (hang- up point).

Advantageously, the aforementioned device is an electrical protection device.

Advantageously, the above-mentioned first device is a differential unit and the second device is a circuit breaker.

Another object of the present invention is to provide a device consisting of a device having the above-mentioned features alone or in combination.

Description of drawings

Other advantages and features of the present invention will become more apparent with reference to the following detailed description, taken in conjunction with the accompanying drawings, which are for illustration purposes only, in which:

1-8 illustrate a first embodiment of the present invention;

Fig. 1 is a perspective view showing two devices fixed to each other by means of a locking mechanism of a fixing device in the present invention;

Figure 2 is the same as Figure 1, but includes a cross-sectional view showing the locking mechanism of the securing device of the present invention;

Figures 3, 4 and 4a are partial sectional views of the above-mentioned views, with the fixing device and locking mechanism in the rest position;

Fig. 4 is a sectional view along IV-IV in Fig. 3;

Fig. 4a is a sectional view along IVa-IVa in Fig. 3;

Figures 5 and 6 are the same views as above, except that the fixing device is in the active position and the locking mechanism is in the rest position;

Figures 7, 8 and 8a are the same views as above, with the fixing device and locking device in the active position and the locking mechanism in the locked position;

Fig. 8 is a sectional view along VIII-VIII in Fig. 7, and Fig. 8a is a sectional view along VIIIa-VIIIa in Fig. 7;

9-11 are partial sectional views showing another embodiment of the locking mechanism of the fixing device of the present invention;

12-22 illustrate another embodiment of the present invention;

Figure 12 is a perspective view representing the securing device in a secured unlocked position;

Figure 13 is a partial sectional view showing the locking mechanism in a fixed, unlocked position;

Figure 14 is a partial sectional view showing the locking mechanism in an irreversible locked position;

Figure 15 is a front view of two means secured to each other, including a sectional view showing the securing means in the secured and locked position;

Figure 16 is a perspective view showing two devices fixed in an irreversible locking position by the fixing device of the present invention;

Figures 17 and 18 are partial cross-sectional views along AA and CC in Figure 19, showing that the fixing device of the present invention is in an unfixed position;

Figure 19 is a partial cross-sectional view of the device of the present invention seen from behind in the same position;

Figure 20 is a partial cross-sectional view along AA in Figure 22, showing the securing device in the secured and locked position;

Figure 21 is a partial cross-sectional view along CC in Figure 22, showing the locking mechanism in the fixed and locked position;

Figure 22 is a partial view of the securing device in the same position, seen from behind.

Detailed ways

In Figures 1 and 2, it can be seen that the circuit breaker D is connected to the differential unit B, and the two devices are designed to be fixed on a mounting rail (not shown). These two devices are arranged in a parallelepiped-shaped housing .These housings consist of a rear plate 1 fastened to the above-mentioned guide rails, bottom connecting plates 3, 4 and top connecting plates 5, 6, four side plates 7, 8, 9, 10, and a front plate with operating handles 13, 14 11, 12. The above-mentioned top connection plate includes the connection joint 18 of the above-mentioned device, and by means of the side plates 8, 9 therein, the above-mentioned two devices are abutted on the fixed position on the guide rail. The above-mentioned differential unit B includes a lock with the circuit breaker D The locking mechanism is mechanically connected to the release locking operating handle 14, and the circuit breaker can also be actuated by means of the handle 13. In Figures 1 and 2, it can be seen that the housing of the differential unit B consists of a connecting plate 4 in the differential unit B The narrow portion 16 extending above and the slightly wider portion 17 extending on the connection plate 3 of the circuit breaker D jointly form a wing 15. These portions forming the above-mentioned wings are used to accommodate the wires of the differential unit B, which can be connected with the circuit breaker D Connector 18 for electrical connection.

The two components B, D are fixed to each other by means of the fixing device 19 according to the invention. Referring to Figures 1-8, it can be seen that the device 19 comprises a slide 20 of substantially T-shaped cross-section comprising a rod 21 and a gripping member 22 extending perpendicularly to said rod. This rod 21 can be inserted into two openings 23, 24 provided respectively in the slightly wider part 17 forming the wings of the differential unit B and in the housing of the circuit breaker D, in order to facilitate the use of the corresponding connection plates 5, 6. The connected fixing buckle 25 prevents relative movement between the two components B and D during the mating process.

Referring to Fig. 3-8a, it can also be seen that the rod 21 includes a protrusion 55 cooperating with the groove 56 and the boss 57 provided in the opening 23 of the wing 15, so that the opening 23, 24 is in the translation process of the sliding part 20. An obstacle point is formed within. The protrusion 55, the groove 56 and the boss 57 form a fastening mechanism movable back and forth for the fixing device 19 in its fixed position. The aforementioned slide 20 includes catches 59 cooperating with slots in the housing 15 in order to obtain a mechanism for securing the slide in the open position.

The fixing device 19 is locked in a fixed position by means of a locking mechanism 26 or latch. This locking mechanism 26 comprises a plate 27 slidably mounted along the outer surface 32 of the slightly wider portion 17 of the wing 15 and from the side of the plate 27 in the direction of the slide 20 and on a plane slightly eccentric with respect to the plane of the plate 27. An extended portion 28 at one end. This portion 28 can cooperate with a groove 29 provided in the gripping part 22 of the slider 20 .

The above-mentioned locking mechanism 26 also includes a fastening mechanism for irreversibly fastening the locking mechanism 26 ( FIGS. 1 and 2 ). This mechanism comprises a sheet 30 folded into a V shape and fixed to the above-mentioned plate 27, which can be inserted into a third opening 31 provided on the above-mentioned wing 15, so that the above-mentioned plate 27 can be formed by the shell of the wing 15. carried by the body. The device is therefore slidably mounted relative to the wing 15 , the tab 30 sliding in the opening 31 and the plate 27 sliding along the outer surface 32 of the wing 15 . In the above-mentioned second opening 31, there is provided an inclined surface which is formed by the casing and cooperates with the one end 34 of the above-mentioned piece, and its operation will be described in detail below.

The operation of the fixing device and the fastening mechanism of the present invention will be described below with reference to FIGS. 1-8.

In Figures 3, 4 and 4a, two devices B, D are moved together to facilitate mechanical connection. Both the fixing device 19 and the fastening mechanism 26 are in an open state.

In Figures 5, 6, the slider 20 is fully inserted into the above-mentioned wings 15 and openings 23, 24 of the circuit breaker D housing. At the end of the translation ( FIG. 8 a ), the protrusion 55 passes the other side of the boss 57 . This boss 57 , forming a snag, then holds the slide 20 , the grip 22 of which rests on the outer surface 32 of the wing 15 , within the openings 23 , 24 . In this position, it can be seen that the end of the rod 21 of the slider 20 is located above the housing bottom position 35 of the above-mentioned circuit breaker D, thus keeping the above-mentioned devices B, D in an assembled state.

In this position, the locking mechanism 26 is in a rest position. The end 34 of the tab 30 bears against the above-mentioned portion forming the slope 33 of the wing 15 . It can be seen that in FIG. 6, the plate 27 of the above-mentioned locking mechanism may also include two bifurcations 36, 37 extending from the two ends of the above-mentioned plate 27 respectively, and the bifurcations 36, 37 may respectively and two The sidewalls 40 , 41 provided in the opening 31 cooperate with the buckle members 38 , 39 so as to hold the above-mentioned mechanism in the opening 31 .

In Figures 7, 8 and 8a, the locking mechanism 26 is moved to an active position in which the portion 28 of the above-mentioned plate 27 engages in the groove 29 provided for the gripping part 22 of the slider 20, and the end of the plate 30 34 is bounded by a side wall 58 formed at one end of ramp 33 . Furthermore, the branches 36, 37 are blocked between the side walls 40, 62 and 41, 63 of the above-mentioned housing, respectively, so as to be positively snapped in this position. In this position, it is impossible for the operator to open the latch without damaging it, thus leaving a visible trace of the attempt. The latch is therefore in an irreversibly locked position.

It can be seen that the above-mentioned latch in the present invention is a separate element, which can be simply snapped onto the circuit breaker housing by manual pressure. The latch is movable until it is fixedly locked to the head of the above-mentioned sliding part. This This kind of latch can be locked irreversibly through the non-return structure.

In FIGS. 9 , 10 , 11 , another embodiment of the invention can be seen, in which the fixing device 19 is formed by a slide 20 with a T-shaped cross-section and comprises three slots 43 , 44 , 45 form two cutouts 41, 42, these grooves can cooperate with the flexible protrusion 46 that is fixed on the shell of wing 15. It can be seen in these figures that two of these grooves 43 , 44 are shaped such that the slider 20 can be easily moved from one groove 43 into the other groove 44 . On the other hand, the third groove 45 of these grooves 43, 44, 45 is formed with a side wall 65 perpendicular to the axis of the rod 21 of the slider 20, so that when the nose 46 is in this groove 45, the slider 20 Just can not move in the opening 23,24 again. In this embodiment, the locking mechanism 26 is formed by a lug 46 cooperating with a third slot 45 located in the vicinity of the intersection of the T-bars forming the slide 20 .

The operation of the fixing device and the locking mechanism in this embodiment will be described below with reference to FIGS. 9 , 10 , and 11 .

In Figure 9, the securing means 19 and locking mechanism 26 are stationary and the two devices B, D are simply moved together to establish a mechanical connection between them. The protruding head 46 is located in the first slot 43 , that is, the slot 43 is located at the position closest to the circuit breaker D. As shown in FIG. To perform fixation of the device, the operator presses on the slide 20 . During this movement, the nose 46 moves from the first slot 43 to the second slot 44, and the fixing means 19 is active in a certain position (FIG. 10). In this position, the slider 20 is irreversibly fixed in this position by the protrusion 46 engaging in the second groove 44 . In FIG. 11 , the sliding part 20 is fully engaged in the openings 23 , 24 , and the protrusion 46 moves into the third groove 45 , thereby locking the sliding part 20 . In this position, and due to the shape of the groove 45 , the slider 20 can no longer be removed from the openings 23 , 24 , without breaking the nose 46 and thus leaving no traces.

According to the embodiment in FIGS. 12-22, the sliding part 20 is formed by two cylindrical parts 47, 48, of which the cylindrical part 47 has a larger diameter and constitutes a gripping part, while the other cylindrical part 48 has a smaller diameter and is inserted into the above-mentioned Differential unit B and circuit breaker D inside wing 15 openings 23, 24 in the housing. Close to the free end 49 of the rod 48 of small diameter, the slider 20 comprises a bolt 50 extending perpendicularly to the axis of the rod 48 . The bolt 50 cooperates with a ramp 51 secured to the rear surface 52 of the housing of the wing 15 .

It can also be seen that in FIGS. 17 and 20, the rod 48 can also include a protrusion 55 that cooperates with the two bosses 53, 54 of the opening 23, so as to be able to move between the open position and the fixed position of the fixing device 19 ( FIG. 17 ). (Fig. 20) constitute two obstacle points respectively.

In fact, it can be seen in Figures 17 and 20 that the protrusions on the above-mentioned rods constitute obstruction points both in the unsecured, unlocked position and in the fixed and locked position.

The operation of the securing device and locking mechanism will now be described with reference to Figures 12-22.

First, the sliding part 20 provided with the bolt 50 is inserted into the two openings 23, 24 provided on the above-mentioned wing housing and the circuit breaker, and the shape and size of these openings can be formed to facilitate the above-mentioned insertion operation (Fig. , 13, 17, 18, 19).

Then, once said slider is engaged in the fixed position, the operator can move the slider 20 in rotation about its axis by a quarter of a turn. During this rotation, the bolt 50 cooperates with the slope 51 provided on the side wall of the opening in the wing 15, and via the other side of the slope 51, the fixing device is locked in a certain position. It is either impossible or necessary to break the above-mentioned bolt 50 to open the above-mentioned fixing device, so this attempt will leave traces (Figures 14, 15, 16, 20, 21, 22). This function is standardized with the purpose of preventing inactivity of the differential modules mentioned above.

For these operations, it should be noted that the locking can be performed immediately or on site after the installation test. If it is intentionally disassembled, the locking mechanism used for locking will be damaged, resulting in traces of disassembly.

This structure suppresses the risk of malfunctioning in the electrical characteristics of the select differential unit and the circuit breaker, which can remain locked at any time, for example after connecting the above-mentioned device to the power system or after installation tests.

When the latch is not engaged in the locked position, the latch should be colored and visible on the front surface, which makes it possible to check with a simple look whether the All devices on this system have been locked.

The sliding part and the locking mechanism are fixed by movement so that no tools are required to perform the operation, and the locking operation can be performed once the device is mounted on the plate in an easily accessible area.

The above-mentioned locking operation is performed by a simple translational (or rotational translational) movement. In order to avoid electric leakage of the circuit breaker when it is pre-installed in the factory, the design of the supporting frame enables the structure including the sliding part and the locking mechanism to be replaced by a simple element having both a fixing function and a locking function.

As long as the customer needs, the above structure in the present invention can perform reversible actions (this makes test installation possible). After moving from the rest position to the active position, the device is in an irreversible position, so that the sliding part can be accurately fixed in the active position.

The present invention is not actually limited to the above-mentioned embodiments, which are for explanatory purposes only.

Thus the present invention can be applied to any electrical distribution, electrical protection and modular control devices.

And on the other hand, the present invention may also include all technically equivalent examples and combinations thereof without departing from the spirit of the present invention.

Claims (17)

1. A locking mechanism for two electrical device fixing devices, the two electrical devices are installed on the same mounting frame and arranged in the housing, each electrical device includes a back plate fixed to the mounting frame, two A connection board, a front board and two side boards, the above-mentioned front board is composed of the control device of the above-mentioned electrical devices, and the above-mentioned electrical devices are connected to each other, one of the two electrical devices is called the first device, and the other is called the second device, The second part is located on the same side as the first part, the first part is constituted by a part forming a wing, which includes a first part extending from the connecting plate of the first part and facing the connecting plate and being able to move to the The second part of the connecting plate of another device, characterized in that the above-mentioned fixing means (19) comprises: between the rest position and the fixed position of the first part (B) and the second part (D), between the rest position and the fixed position of the above-mentioned wing sliding part (20) moving inside and inside the housing of the second device (D), latch (26) moving between the rest position and the locking position of said fixing means (19) in said fixed position, and an irreversible fastening mechanism (27, 30, 33, 45, 46, 50, 51) capable of irreversibly fastening said latch to said locked position. 2. The locking mechanism according to claim 1, characterized in that, the above-mentioned fixing device comprises a reversible fastening mechanism (43, 44, 46, 53, 54, 55, 56, 57), and the above-mentioned sliding part (20 ) is reversibly fastened to the aforementioned fixed position. 3. The locking mechanism according to claim 1 or 2, characterized in that the above-mentioned sliding part (20) is movably installed between a rest position and a fixed position, and performs translation. 4. The locking mechanism according to claim 2, characterized in that, the above-mentioned sliding part (20) comprises a rod (21) and a gripping member (22), and the above-mentioned rod (21) can continuously pass through the ) on the second part (17) of the first opening (23) and an opening (24) called the second opening provided on the housing of the second device (D). 5. Locking mechanism according to claim 4, characterized in that said reversible fastening mechanism (55, 56, 57) comprises a protrusion (55) formed on the rod (21) of said slider (20) ), the protrusion can cooperate with a groove (56) behind the boss (57) on the wall defining the first opening (23), so as to reversibly fix the sliding part (20) in a fixed position superior. 6. The locking mechanism according to claim 4, characterized in that, said sliding part (20) has a T-shaped section, and said gripping part (22) is formed by a flat part, capable of being connected to said wing ( 15) in contact with the outer surface (32). 7. The locking mechanism of claim 1, wherein said latch (26) comprises a plate (27, 28) movable along said wing (15) between a first position and a second position The housing outer surface (32) slides, in the above-mentioned first position, the above-mentioned fixing device (19) is not locked, in the above-mentioned second position, the gripping parts of the above-mentioned plates (27, 28) and the sliding part (20) (22) cooperate so as to lock the above-mentioned fixing device (19) on the above-mentioned fixed position. 8. The locking mechanism according to claim 7, characterized in that, in the above-mentioned locked position, the irreversible fastening mechanism of the above-mentioned latch (26) includes a fixed and A piece (30) in the opening (31) called the third opening, which piece (30) is connected to the above-mentioned plate (27) by one end, and cooperates with an inclined surface (33) by the opposite end, so as to facilitate Said latch (26) is irreversibly fixed in said locked position, and said ramp is formed on a wall defining said third opening (31). 9. The locking mechanism according to claim 8, characterized in that, the above-mentioned piece (30) can be folded into a V shape. 10. The locking mechanism according to any one of claims 7 to 9, characterized in that said latch (26) comprises two bifurcations extending from the plate (27) perpendicular to the plane of the plate (27) (36, 37), which branch comprises at its ends elements (38, 39) that snap onto a part of the housing of said wing (15), so as to enable reversible snapping of said latch (26) in the rest position, and irreversibly stuck in the active position. 11. The locking mechanism according to claim 4, characterized in that the rod (21) of the above-mentioned sliding part (20) comprises two cutouts (41, 42) forming three slots (43, 44, 45), It is used to cooperate with the flexible protrusion (46) so as to fix the corresponding three grooves (43, 44, 45) of the sliding part (20) in the open position, the reversible fixed position and the irreversible locked position respectively , the three grooves (43, 44, 45) include a first groove (43), a second groove (44) and a third groove (45), and the above-mentioned protrusion is fixed on the third opening that limits the above-mentioned wing (15) On the wall of (31), the above-mentioned protrusion (46) and the third groove (45) form an irreversible locking mechanism. 12. The locking mechanism according to claim 11, characterized in that, starting from one end of the above-mentioned rod (21) on the side where the first part (B) and the second part (D) are located, the above-mentioned first slot ( 43) corresponds to the above-mentioned open position, the second slot (44) corresponds to the fixed position, and the third slot (45) corresponds to the irreversible locking position. 13. The locking mechanism according to claim 4, characterized in that, the rod (21) of the above-mentioned sliding part (20) comprises a bolt (50) extending perpendicular to the axis of the rod (21), and the bolt can be arranged on The fixed inclined surface (51) on the wall of the third opening (31) in the above-mentioned wing (15) cooperates so that the translation of the sliding part (20) and the bolt (50) passes through the first opening provided in the above-mentioned wing (15). Behind an opening (23) and the housing of the second device (D), said slider (20) can be driven in rotation between a first position and a second position, said first position corresponding to the first device (B) and the unfixed state of the second device (D), and in the second position, the above-mentioned sliding part irreversibly locks the above-mentioned latch (26), after the sliding part passes through the above-mentioned slope (51), the bolt (50) Located on the other side of the slope (51). 14. The locking mechanism according to claim 13, characterized in that, the rod (21) of the above-mentioned sliding part (20) includes two bosses (53, 54) corresponding to the wall of the first opening (23). The matching protruding head (55) is so as to be able to respectively form obstacle points on the unfixed position and the reversibly fixed position of the above-mentioned sliding part (20). 15. The locking mechanism according to claim 1 or 2, characterized in that the above-mentioned device is an electrical protection device. 16. The locking mechanism according to claim 1 or 2, characterized in that the first device is a differential unit (B), and the second device is a circuit breaker (D). 17. An electrical device comprising the locking mechanism of claim 1.

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