EP2758977B1 - Electrical line protection device provided with means of indicating an electrical fault on the line - Google Patents

Description

The present invention relates to the signaling of an electrical fault on a circuit-breaker type electrical protection device equipped with a mechanism for abrupt closing of the contacts. This kind of device will be described a little further.

The invention essentially relates to an indicator means which signals a fault and which must also memorize the information until the device is reset. More specifically, the invention consists in indicating to a user whether the device in question has been opened manually or whether it has been opened due to an electrical fault on the line, whether overload or overload. 'A short-circuit.

To improve safety, the signaling system of the invention is mechanical, not electrical and operating in dependence on a power source of the electrical installation that the circuit breaker protects.

Many mechanical signaling systems exist, but are systematically adapted to different devices from that of the invention. In fact, the internal triggering mechanisms differ from one device to another, depending on their function, their shape, the number of poles, etc.

The object of the present invention is therefore to set up a fault indicator within the apparatus as described below, without inducing a substantial change in the mechanism of the device. The installation of this indicator inside the device must be easy and must fit easily into the current manufacturing process of the product. In addition, the solution must be economically advantageous.

The type of apparatus in question comprises at least one movable contact intended to cooperate with at least one fixed contact, the movable contact being pivotally arranged relative to a contact holder (s) of a mechanical lock, their positioning relative to the rest being ensured by the action of a said contact spring to ensure a correct pressure to the closing contacts. This contact carrier (s) is itself driven by a rotational movement to position the movable contact alternately against and away from the fixed contact, in particular by manual action on a control lever pivoting between two stable positions (ON position closing the contacts and OFF contact opening position), and causing the rotation of the contact carrier (s) by a conventional toggle mechanical system.

The contact carrier can also be rotated due to a mechanical action of an actuator echoing an electrical fault on the line. In this case, the contact carrier first positions the moving contact at a distance from the fixed contact, and secondly causes the rotation of the control lever to the OFF position.

Such a sudden closure mechanism, for example disclosed in the patent EP 1 170 769 , mainly comprises two members pivoting respectively with the control handle and the movable contact, with trajectories that interfere during a fraction of their combined rotation. These members are provided for cooperating in order to block the moving contact at a distance from the fixed contact during said rotation fraction, before sudden release at the end of the cooperation phase, and subsequent closing of the contacts at a speed independent of the speed exerted. on the controller.

The members of the invention participating in the abrupt closure function consist of a cam driven by the control lever, in which it is arranged free to rotate at an angular displacement between two indexing positions, and a finger integral with the lock, the positioning of which with respect to the cam and the movable contact is such that the finger and the cam come into contact when the fixed and movable contacts are spaced apart by a predetermined residual distance, the cam having an external surface along which the finger slides when the rotation of the joystick continues, of length and shape such that said finger remains locked in rotation during a fraction of rotation of the joystick less than its residual travel to reach its stable position of closure of the contacts.

The contact carrier (s) continues its course, while the contact spring accumulates energy that releases suddenly when the contact cam / finger stops, in the last portion of the travel of the joystick. The cam can then continue to rotate relative to the joystick.

• en deuxième position d'indexation dans la manette en position ON;
• en première position d'indexation dans la manette en position OFF suite à son accrochage avec le doigt de la serrure lors d'une action manuelle sur la manette ;
• en deuxième position d'indexation dans la manette en position OFF suite au basculement de la serrure entraînant la rotation de la manette en cas de défaut électrique.

Concretely, the cam is:

• in second indexing position in the joystick in the ON position;
• in first indexing position in the lever in the OFF position following its hooking with the finger of the lock during a manual action on the joystick;
• in second indexing position in the lever in the OFF position following the tilting of the lock causing the rotation of the handle in the event of an electrical fault.

The invention essentially comprises indicator means signaling the appearance of an electrical fault and storing this information until the reset of the joystick in the ON position. Said indicator means consist of a portion of said cam visible through a window made in the drum in the OFF position of the joystick following an electrical fault, and not visible in the ON / OFF positions of the joystick following a manual action.

More specifically, said window of the drum is positioned radially in front of said portion when the cam is in the second indexing position in the handle in the OFF position following an electrical fault.

According to the invention, the window is made in the outer face of the drum visible by a user when the handle is in the OFF position.

Preferably, the surface of the portion of the cam visible from the outside through the window carries a signaling marking of a defect.

According to one possible configuration, said signaling marking of a defect may consist of a distinct color or surface condition (e) of the color or surface condition of the inner walls of the drum. For example the portion may be colored red while the drum is generally gray as the circuit breaker case.

Any other type of marking may however be considered within the scope of this invention.

According to a first possibility, said portion of the cam constituting the indicator means consist of an angular sector of the cam.

According to another possibility, the portion of the cam constituting the indicator means consist of a lug secured to said cam in rotation inside the drum of the joystick.

• un fût d'allure cylindrique creux tournant autour d'un tourillon central équipant le centre du tambour de la manette ;
• une excroissance radiale s'étendant à partir dudit fût et comportant une extrémité libre constituant un secteur angulaire protubérant coopérant avec le doigt de la serrure ;
• un élément élastique consistant en une languette fixée à la surface externe du fût et se développant sensiblement parallèlement au fût tout en s'en écartant progressivement en direction de son extrémité libre, cette dernière étant dirigée vers l'excroissance radiale et placée du côté de l'excroissance entrant en premier en contact avec ledit doigt lors de la fermeture des contacts ;
• ladite portion d'indication de défaut localisée au niveau de la surface externe du fût et située sensiblement à l'opposé de la languette par rapport à l'axe de symétrie centrale du fût.

In a particularly preferred embodiment, the cam comprises:

• a barrel of hollow cylindrical shape rotating around a central spigot equipping the center of the drum of the lever;
• a radial protuberance extending from said barrel and having a free end constituting a protruding angular sector cooperating with the finger of the lock;
• an elastic element consisting of a tongue attached to the outer surface of the drum and developing substantially parallel to the drum while gradually moving away towards its free end, the latter being directed towards the radial protuberance and placed on the side of the protrusion first entering into contact with said finger during closure of the contacts;
• said fault indication portion located at the outer surface of the barrel and located substantially opposite the tongue relative to the central axis of symmetry of the barrel.

The drum of the lever meanwhile has an opening disposed substantially opposite the lever and allowing the passage of the radial protrusion and the free end of the tongue, the radial edges of the opening defining the angular space where the cam is free to rotate.

According to a possible configuration of indexing, these radial edges constitute abutments between which the cam is free in rotation, the cam being in first (respectively second) indexing position in contact with the stop.

Specifically, during the rotation of the cam in the drum, the free end of the tongue is adapted to come into contact with one of the stops of the opening of the drum, while the edge of the protrusion not facing with the tongue is adapted to come into contact with the other stop of the opening of the drum during a reverse rotation.

Thus, the fault indication portion is located opposite the window when the free end of the tongue is in contact with one of the stops in the OFF position of the joystick following an electrical fault.

In addition, a lug protruding from the tongue also cooperates with the stop so as to maintain the cam in the second indexing position during an automatic opening following a fault.

More specifically, said lug is then either at an end ramp of the abutment when the protrusion is in contact with the stop or in contact with an inner wall of the handle drum when the free end tongue comes into contact with said ramp.

In fact, each indexing position is then characterized by the existence of a rotational abutment and a holding means in said abutment, which consists of the ramp / lug cooperation in one case and the friction lug / inner wall. drum in the other case.

According to another possible configuration, the indexing can be performed via the fault indicator portion, when it corresponds to a tab. For this purpose, the inner wall of the handle is provided with a protruding spur near the window and adapted to fit into one of the two notches made in the inner face of the fault indication tab, the cam being in first or second indexing position following the notch in which the spur is housed.

Thus, the fault indication tab is located opposite the window when the spur is housed in the proximal notch of the radial protrusion of the cam in the OFF position of the joystick following an electrical fault.

• la figure 1 a représente un disjoncteur ayant déclenché manuellement ;
• la figure 1b montre un disjoncteur ayant déclenché suite à un défaut électrique ;
• la figure 2 est une vue en perspective d'une manette de commande selon l'invention ;
• la figure 3 illustre une came selon l'invention ;
• les figures 4a à 4c montrent un cycle d'ouverture manuelle n'induisant pas d'indication de défaut ;
• les figures 5a à 5c représentent un cycle d'ouverture automatique conduisant au signalement d'un défaut électrique ;
• les figures 6a à 6d illustrent un cycle de fermeture des contacts suite à une ouverture manuelle ;
• les figures 7a à 7c présentent un cycle de fermeture des contacts suite à une ouverture automatique ;
• les figures 8a et 8b illustrent une autre configuration de tambour et de came selon l'invention.

The invention will now be described in more detail, with reference to the appended figures, for which:

• the figure 1 a represents a circuit breaker that has tripped manually;
• the figure 1b shows a circuit breaker tripped due to an electrical fault;
• the figure 2 is a perspective view of a control lever according to the invention;
• the figure 3 illustrates a cam according to the invention;
• the Figures 4a to 4c show a manual opening cycle that does not induce a fault indication;
• the Figures 5a to 5c represent an automatic opening cycle leading to the signaling of an electrical fault;
• the Figures 6a to 6d illustrate a closing cycle of the contacts following a manual opening;
• the Figures 7a to 7c have a closing cycle of the contacts following an automatic opening;
• the Figures 8a and 8b illustrate another drum and cam configuration according to the invention.

With reference to figures 1 a and 1b, the circuit breaker (1) comprises a molded plastic casing (2) which protrudes from a control handle (3) whose two stable positions ON and OFF respectively correspond to the closing and opening of the contacts. The handle (3) is in the OFF position on the figures 1 a and 1 b.

A window (4) located under the lever (5) of the handle (3) cooperates with the signaling means of the invention. More specifically, on the figure 1 a, the signaling means are not visible through the window (4), meaning that the circuit breaker (1) has triggered following a manual action on the control handle (3). On the contrary, on the figure 1b , a signal of color (6) appears through the window (4), signifying that the circuit breaker (1) has tripped due to an electrical fault on the line.

The window (4) is made in the handle (3) and is clearly visible on the front panel of the circuit breaker (1).

As illustrated in figure 2 , the handle (3) consists mainly of a drum (7) and a control lever (5) extending radially from the drum (7). The latter is composed of two coaxial walls, namely an inner wall (9) and an outer wall (8). The window (4) is formed in said outer wall (8), and located under the lever (5). A central pin (10) equips the center of the drum (7) delimited by the inner wall (9).

With reference to the figure 3 , the cam (11) comprises a barrel (12) of hollow cylindrical shape able to rotate around the central pin (10) of the drum (7). A radial projection (13) extends from the shank (12) and has a free end (14) constituting a relatively large protuberant angular sector coaxial with the cylindrical surface of the shank (12).

An elastic member consisting of a tongue (15) is attached to the outer surface of the barrel (12). This tongue (15) develops substantially parallel to the shaft (12), however gradually moving away towards its free end (16), the latter being directed towards the protuberance (13) radial.

A lug (27) protrudes from the tongue (15) near its middle.

A defect lug (17) is attached to the outer surface of the shank (12) and located substantially opposite the tongue (15) relative to the central axis of symmetry of the shank (12). The outer surface (6) of the tab (17) is preferably colored red, symbolic color of a fault signal.

Concretely, this lug (17) is able to circulate inside the hollow space defined between the two walls (8, 9) of the drum (7) when the cam (11) pivots around the pin (10). Depending on its position, the tab (17) is visible through the window (4), or hidden under the outer wall (8) of the drum (7).

So that the cam (11) can pivot about the pin (10), an opening (18) is formed in the walls (8, 9) of the drum (7). This opening (18) is disposed substantially opposite the lever (5) and allows the passage of the radial protrusion (13) and the free end (16) of the tongue (15), the radial edges (19). 20) of the opening (18) constituting the stops between which the cam (11) is free to rotate.

In practice, as can be seen in the Figures 4a to 7c during the rotation of the cam (11) in the drum (7), the free end (16) of the tongue (15) is adapted to come into contact with one (20) of the stops of the opening (18) of the drum (7), the cam (11) then being in first indexing position in the handle (3), while the edge of the protuberance (13) not facing the tongue (15) is adapted to come into contact with the other stop (19) of the opening (18) of the drum (7), the cam (11) then being in the second indexing position in the handle (3).

The Figures 4a to 7c show all the relative positions of the cam (11), and even more so of the tab (17), relative to the drum (7) during the opening and closing phases of the contacts.

In general, the control mechanism of the circuit breaker (1) consists of a handle (3) (as described above) connected to a contact carrier (21) by a rod (22). It is therefore a conventional toggle lock system for tilting the contact carrier (21) following the pivoting of the handle (3) by a manual action on the lever (5). The contact carrier (21) further supports a trigger (31) adapted to switch it in case of detection of an electrical fault on the line.

A torsion spring (not shown) is placed between the movable contact (23) and the contact carrier (21). This spring is used to store energy to make a sudden closure of the contacts when the movable contacts are immobilized by the abrupt closure mechanism, then to maintain the pressure between the fixed contacts (24) and movable (23).

A finger (25) integral with the contact carrier (21) extends outwardly thereof in the direction of the protuberance (13) of the cam (11) inserted in the control handle (3). The free end (26) of the finger (25) is provided to cooperate with the outer surface (14) of the protuberance (13) of the cam (11).

Indeed, the finger (25) and the protuberance (13) have trajectories that interfere during manual opening of the contacts as illustrated in FIGS. Figures 4a to 4d .

In figure 4a , the contacts are closed, the handle (3) is in the ON position, and the protuberance (13) of the cam (11) is in contact with the stop (19) in the drum (7), the cam (11) being in second indexing position. If the control knob (3) is manually actuated clockwise, the cam (11) follows the rotational movement until the free end (14) of the protrusion (13) comes into contact with the finger (25) of the contact carrier (see figure 4b ), thereby immobilizing the cam (11) for a fraction of the rotation of the handle (3), until the tongue (15) of the cam (11) comes into contact with the stop (20) in the drum (7) (see figure 4c ). During this movement, the tongue (15) is then slightly deformed toward the shaft (12), the lug (27) moving in contact with the stop (20), which consists of a lug whose free end constitutes a ramp, until coming into frictional contact on the coaxial inner wall (9) of the handle (3). The cam (11) therefore changes its relative position inside the handle (3), between the figure 4b and the figure 4c , and passes from the second to the first indexing position thanks to the flexibility of the tongue (15) combined with the locations of the different stops (19, 20). The handle (3) ends its residual stroke to reach its OFF position, causing on the one hand with it the cam (11) in rotation, and on the other hand causing the tilting of the contact carrier (21) by the toggle mechanism , separating the finger (25) from the protrusion (13) and the movable contact (23) from the fixed contact (24). The figure 4d shows the final state of opening of the contacts. With the knob (3) in the OFF position, the window (4) is visible from the outside of the circuit breaker (1). The cam (11) being in first indexing position in the handle (3), the signaling lug (17) is hidden behind the outer wall (8) of the drum (7), and not in front of the window (4). There is no fault indication, the opening of the contacts having been caused by a manual action on the joystick (3) control.

The Figures 5a to 5c show the case of an automatic opening of the contacts. The figure 5a is identical to the figure 4a since it is the same starting position. The figure 5b differs from the figure 4b in that the handle (3) is not manipulated, but the contact carrier (21) has tilted by an action of the actuator (magnetic or thermal) on the trigger (31) following the detection of a defect , immediately causing the toggle switch to open and the contacts to open. Due to the release of the rod (22), the rotation of the contact-carrier assembly (21) / trigger (31) is independent of the rotation of the joystick, and is carried out quickly - under the effect of means specific reminder - at first. The handle (3) and the rod (22) are then, in a second step, returned to the OFF position, corresponding to the figure 5c by means of a return spring of the handle (3). When this opening of the contacts, the finger (25) and the protrusion (13) do not collide, and the cam (11) remains pressed against the stop (19) during the pivoting of the lever (3) in particular thanks to the lug (27) which is in contact with the end of the end ramp of the abutment (20) so as to retain the cam (11) in its second indexing position in the handle (3). In the OFF position, the window (4) is thus visible from the outside of the circuit breaker (1), and the tab (17) is this time in front of the window (4). The red outer surface (6) of the tab (17) is therefore clearly visible by a user, and indicates a tripping of the circuit breaker following an electrical fault.

The Figures 6a to 6d represent the reset of the circuit breaker (1) following a manual opening of the contacts.

In figure 6a , identical to the figure 4d , the handle (3) is shown in its OFF position following manual opening, with the cam (11) in the first indexing position, and the signaling tab (17) not visible at through the window (4). In this position, the finger (25) is located at a distance from the protrusion (13) of the cam (11).

When the lever (3) is pressed in the direction of closing the contacts, as appears in figure 6b , that is to say, when it is rotated counterclockwise, the movable contact (23) is rotated by the contact carrier (21) in the clockwise direction. In this case, the finger (25) as well as the protuberance (13) of the cam (11) progress towards each other, substantially in the same direction, until their free ends (26, 14 ) meet. This collision causes on the one hand the stop of the movement of the finger (25), and on the other hand the stop of the rotation of the cam (11) while the lever (3) continues its rotation. The cam (11) is rotated again by the handle (3) from the moment when the stop (19) of the drum (7) comes into contact with the protrusion (13) of the cam (11), as illustrated in Figure 6c . The cam (11) is therefore passed from the first to the second indexing position in the handle (3).

While the finger (25) is always stopped by the outer surface (14) of the protrusion (13), a relative sliding occurs between the two (25, 13) when the cam (11) continues its rotation. Thus, although the rotation of the control lever (3) has progressed well, the movable contact (23) has remained stationary, and at the same distance from the fixed contact (24).

When the finger (25) stops being in contact with the outer surface (14) of the protuberance (13), a sudden release occurs because nothing is more opposed to the further rotation of the movable contact (23). ), thanks to the energy stored by the torsion spring interposed between said contact (23) and the contact carrier (21). The protrusion (13) is thus rejected at a distance from the free end (26) of the finger (25) and the contacts (24, 23) close abruptly. The figure 6d thus illustrates the ON position of the handle (3) with the contacts closed and the cam (11) in the second indexing position in the handle (3).

The Figures 7a to 7c present the different phases of a reset circuit breaker (1) following an automatic opening of contacts (23, 24) caused by an electrical fault. The closing cycle of the contacts is almost identical to that described above. The main difference with the resetting following a manual opening lies in the initial position of the cam (11) in the lever (3), which is already in the second indexing position. Therefore, when the finger (25) collides with the protrusion (13), the cam (11) is not immobilized but continues its rotational movement led by the handle (3), and the relative slip s' operates between the finger (25) and the protrusion (13). The abrupt closing takes place in the same way. The final position of the cam (11) in the handle (3) after closing the contacts is always identical, and is found in the Figures 4a , 5a , 6d and 7c . In this position, the handle (3) is in the ON position and the window (4) is not visible to the user.

The Figures 8a and 8b illustrate another solution for indexing the cam (11) within the handle (3). In this configuration, the rotation of the cam (11) is no longer limited by the radial edges (19, 20) of the opening (18) of the handle (3) but by the interlocking of a spur (30). ) of the handle (3) in two notches (28, 29) of the cam (11). More specifically, the spur (30) protrudes from the inner coaxial wall (9) of the drum (7) of the handle (3), in the vicinity of the window (4). At the same time, two notches (28, 29) are formed in the inner surface of the defect index tab (17) forming part of the cam (3). These two notches (28, 29) are distal to an arc corresponding to the angular displacement of the cam (11) in the handle (3) between its two indexing portions.

Specifically, when the spur (30) is housed in the notch (29) (respectively (28)), the cam (11) is in its first (respectively second) indexing position.

The notches (28, 29) have chamfered edges to facilitate passage of the spur (30) from one notch to the other. This passage is allowed by the force exerted by the finger (25) on the cam (11) during collisions.

The invention has been described by means of a particular example of configuration, in particular as regards the fault indication means characterized by a tab (17) on the cam (11) and on the indexing means of the cam (11). ) in the lever (3), which are however not limiting. The invention encompasses all variants of shape and configuration that are within the reach of those skilled in the art.

Claims (15)

1. Electrical line protection device of the circuit-breaker type (1), comprising a handle (3) for controlling at least one movable contact (23) capable of being moved between two stable positions, respectively resting against and distant from a fixed contact (24), the said handle (3) being linked to the movable contact (23) by means of a mechanical lock suitable to be rocked so as to cause the opening of the contacts (23, 24):

   - following a manual action on the lever (5) of the handle (3), which pivots between an ON position in which the contacts (23, 24) are closed and an OFF position in which the contacts (23, 24) are open;

   - following a mechanical action of an actuator reflecting an electrical fault on the line;

   a mechanism for the abrupt closure of the contacts (23, 24) being inserted between the handle (3) and the lock and comprising:

   - a cam (11) moved by the handle (3) and arranged to freely rotate in the drum (7) of the handle (3) according to an angular clearance between two indexing positions;

   - a finger (25) integral with the lock and suitable for coming into contact with the cam (11) until it is immobilised for a portion of the rotation of the handle (3) when the contacts (23, 24) are manually opened/closed, causing a change of position of the cam (11) inside the handle (3);

   said cam (11) being:

   - in the second indexing position in the handle (3) in the ON position;

   - in the first indexing position in the handle (3) in the OFF position following its latching with the finger (25) of the lock when a manual action is performed on the handle (3);

   - in the second indexing position in the handle (3) in the OFF position following the rocking of the lock causing rotation of the handle (3) in the event of an electrical fault;

   characterised in that it comprises indicator means indicating the occurrence of an electrical fault and storing this information until the handle (3) is reset in the ON position, the said indicator means consisting of a portion of said cam (11) which is visible through a window (4) formed in the drum (7) in the OFF position of the handle (3) following an electrical fault, and is not visible in the ON/OFF positions of the handle (3) following a manual action.
2. Electrical line protection device of the circuit-breaker type according to the preceding claim, characterised in that the said window (4) of the drum (7) is positioned radially opposite to the said portion when the cam (11) is in the second indexing position in the handle (3) in the OFF position following an electrical fault.
3. Electrical line protection device of the circuit-breaker type according to one of the preceding claims, characterised in that said window (4) is made in the outer face of the drum (7) and visible to a user when the handle (3) is in the OFF position.
4. Electrical line protection device of the circuit-breaker type according to one of the preceding claims, characterised in that the surface (6) of the portion of the cam (11) that is visible from the outside through the window (4) carries a fault indication marking.
5. Electrical line protection device of the circuit-breaker type according to one of the preceding claims, characterised in that the said fault indication marking may consist of a colour or surface state different from the colour or surface state of the inner walls of the drum (7).
6. Electrical line protection device of the circuit-breaker type according to one of the preceding claims, characterised in that said portion of the cam constituting the indicator means consists of an angular section of the cam (11).
7. Device according to one of claims 1 to 5, characterised in that said portion of the cam constituting the indicator means consists of an arm (17) integral with said cam (11) rotating inside the drum (7) of the handle (3).
8. Electrical line protection device of the circuit-breaker type according to one of the preceding claims, characterised in that the said cam (11) comprises:

   - a hollow cylindrical barrel (12) turning about a central spindle (10) fitted in the centre of the drum (7) of the handle (3);

   - a radial appendage (13) extending from the said barrel (12) and comprising a free extremity (14) forming an protruding angular sector cooperating with said finger (25) of the lock;

   - an elastic element consisting of a tongue (15) fixed to the outer surface of the barrel (12) and extending essentially parallel to the barrel (12) while progressively separating from the barrel (12) in the direction of its free extremity (16), the latter being directed towards the radial appendage (13) and placed at the side of the appendage (13) that first comes into contact with the finger (25) when the contacts (23, 24) are closed;

   - said fault indicator portion situated at the level of the outer surface of the barrel (12) and essentially opposite to the tongue (15) with respect to the central axis of symmetry of the barrel (12).
9. Electrical line protection device of the circuit-breaker type according to the preceding claim, characterised in that the drum (7) of the handle (3) comprises an opening (18) arranged essentially opposite to the lever (5) and allowing the passage of the radial appendage (13) and the free extremity (16) of the tongue (15), the radial edges of the opening delimiting the angular space where the cam (11) is free to rotate.
10. Electrical line protection device of the circuit-breaker type according to the preceding claim, characterised in that the radial edges of the opening (18) form stops (19, 20) between which the cam (11) is free to rotate, said cam (11) being in the first (respectively second indexing position when in contact with the stop (20) (respectively (19)).
11. Electrical line protection device of the circuit-breaker type according to the preceding claim, characterised in that while the cam (11) rotates inside the drum (7), the free extremity (16) of the tongue (15) is suitable for coming into contact with the stop (20) of the opening (18) of the drum (7), while the edge of the appendage (13) not facing the tongue (15) is suitable for coming into contact with the other stop (19) of the opening (18) of the drum (7).
12. Electrical line protection device of the circuit-breaker type according to the preceding claim, characterised in that the fault indicator portion is situated opposite to the window (4) when the free extremity (16) of the tongue (15) is in contact with the stop (20) in the OFF position of the handle (3) following an electrical fault.
13. Device according to one of claims 8 to 12, characterised in that a foot (27) protruding from the tongue (15) also cooperates with the stop (20) in such a way as to maintain the cam (11) in the two indexing positions, said foot (27) then being situated either at the level of an end ramp of the stop (20) when the appendage (13) is in contact with the stop (19) or in contact with an inner wall (9) of the drum (7) of the handle (3) when the free extremity (16) of the tongue (15) comes into contact with the said ramp.
14. Device according to one of claims 8 and 9, characterised in that the inner wall (9) of the handle (3) is provided with a spur (30) protruding in the vicinity of the window (4) and suitable for being inserted into one of the two notches (28, 29) made in the inner face of the fault indicator arm (17), the cam (11) being in the first (respectively second) indexing position when the spur (30) is housed in the notch (29) (respectively 28).
15. Device according to the preceding claim, characterised in that the fault indicator arm (17) is situated opposite to the window (4) when the spur (30) is housed in the notch (28) in the OFF position of the handle (3) following an electrical fault.

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