Field of Invention The invention belongs to the field of devices for electronic surge protection, more precisely for a mechanism in a base part in combination with actuating elements of an overvoltage circuit breaker that allows simple electronic and position signalisation of a state of a surge protective device. Technical Problem

The technical problem solved by the present invention is a constructional solution to a mechanism both for signalling disconnection in a module of a surge protective device and for insulating a disconnection site. Signalling of disconnection must be carried out both visually and mechanically indirectly through a base part. Immediately after the surge protective device has been disconnected, the mechanism must protect the disconnected site with an insulation material, which prevents formation of arc and a further transfer of current from a disconnecting tongue to an electrode of a varistor. A further task of the invention is also conversion of a mechanical signal triggered by the mechanism for signalling disconnection of the surge protective device to an electronic signal, which enables a user to detect a breakdown of the surge protective device in an electronic way. A further task of the invention is to provide a possibility of detecting presence of the module and also a control of a properly inserted module in the base part.

Prior Art

A solution to mechanical protection of a disconnected site is known from the concept of a rotational disc of the applicant of patent No. SI23303 A dated 19/02/20 0. Optimisation of signalling the state of an overvoltage circuit breaker is not known, and it is further not known that some additional component parts having specific shapes can be added for the needs of signalling disconnection on the rotational disc and additionally on the base part of the circuit breaker. Since the concept of disconnection that is conceived on disc rotation is protected, the current prior art does not have any similar solutions of other applicants that could be cited here neither for protecting a disconnection site nor for visual and mechanical signalisation, if use of rotational movement of a disconnecting assembly is taken into account.

As far as a transfer of a disconnection signal from a module into a base part is concerned, a similar principle of operation is disclosed in patent DE202004006227U1 , wherein a principle of a movable element is applied, which element, when in a standby mode, changes the position upwards by means of a spring upon disconnection in the module, presses against a third element and enables a change in the state of a micro switch in the base part. In this solution additional levers for activating the micro switch upon disconnection are used. The micro switch in the present solution is always active in the initial position and gets disconnected only after the indication pin has been removed. Movement is only performed in vertical direction and there is only one element that transfers the movement.

A similar principle of signalisation is also disclosed in WO20061 1 1793A1 , where the transfer of a disconnection signal is made possible by an element, whose force of the spring causes a movement upwards when a space in the module is free and activates a third element. The third element connects the mechanical movement of all poles to one micro switch, which calls for high precision of production of this element, precise positioning and preserving this position, which considerably increases a possibility of a mistake in the transfer of movement due to a torque that appears with multi-pole products. A way of transfer of the movement from the indication pin to the micro switch in the present invention is minimal and thus much more efficient and reproducible. The movement assembly does not comprise a third element between the indication pin and the micro switch, and the link between the poles is electronic and not mechanical. Solution to the Technical Problem

The essence of the mechanism for signalling disconnection in a surge protective device of the invention lies in that due to mechanical links between individual module parts a rotational disc gets moved after a protective module has been disconnected and a tooth of the rotational disc disengages from a tooth of a plate in the base of the module and moves the plate to the left. Because of a spring, a pin of an actuator in the base part moves vertically into a round opening on the plate. As a side wall of the actuator is shaped in a slant manner, a switch of a micro switch is released, which micro switch electronically signalises disconnection. As the rotational disc moves its cylindrical holder simultaneously runs on a bend of the upper plate and actuates a button that moves and mechanically indicates module disconnection. The mechanism for signalling disconnection in a surge protective device of the invention will be described in more detail in the continuation by way of drawings representing in:

Figure 1 - Elevation of a base part with a rotational circuit breaker in an active

state

Figure 2 - Detail A

Figure 3 - Elevation of the base part with the rotational circuit breaker in a

disconnected state

Figure 4 - Detail B

Figure 5 - Base part assembly

Figure 6 - Plate 21 , rotational disc 22 and plate 24

Figure 7 - Printed circuit boards for one, two, three or four modules

Figure 8 - Printed circuit board for eight modules

Figure 9 - Base part for eight modules

A construction of the mechanism for signalling disconnection in a surge protective device, preferably with a rotational circuit breaker, is characterized by the shape of a base part 1 for receiving a surge protection module 2. The base part 1 has a middle portion 1 1 , in which cylindrical lugs 1 1 1 , 1 12, 1 13 and 1 14 are arranged. A printed circuit board 3 is arranged on the cylindrical lugs 1 1 1 , 1 12, 1 13 and 1 14 through round openings 31 , 32, 33 and 34. After the board 3 is positioned, two springs 4 and 5 are arranged on the cylindrical holders 1 1 and 1 2, said springs being retained at the other side by a lower side of an actuator 6. The ends of the cylindrical lugs 1 1 1 and 1 12 are fixed on the actuator 6 in round seats 61 and 62, between which a cylindrical pin 63 with a semi-circular top is arranged. The actuator 6 has trapeze-shaped lateral sides 6a, wherein a shorter side 6a' of the trapeze is arranged in the lower part of the actuator 6. A micro switch 7 is arranged on the board 3 on the cylindrical holders 13 and 1 14 in a way that a switch 7a is closed by a longitudinal side 6b of the actuator 6.

The surge protective module 2 with the rotational circuit breaker is provided in the bottom with a lower part 21 with a side wall 21 a that is provided with a round hole 21 b to the right of the centre line. Perpendicularly to the side wall 21 a there is a part 21 c provided in its left part with a tooth 21 d, and in its right part with a tooth 21f, between which a bend 21 e is arranged. A rotational disc 22 is formed to have in its lower part a tooth 22a, a cylindrical lug 22b, and a cylindrical lug 22d in the projecting portion 22c of a disc 22. The module 2 is provided in its upper part by a plate 24 having an opening 24a and a substantiall oval opening 24b, in which a button 26 for mechanical signalisation of the state of the module 2 is arranged. The module 2 has a helical spring 23 and a disconnecting tongue 25.

The mechanism of the present solution to the disconnection and visual indication comprises: a support 27 of the rotational disc, the rotational disc 22, a cover 28 of the support of the rotational disc, the plate 24 for visual indication, the plate 21 for locking the indication, the helical spring 23 and the disconnecting tongue 25. In its initial position, the rotational disc 22 with its special shape retains the visual indicator in its upper position and the lock of the indication in its lower position in a way that the cylindrical lug 22d keeps the button 26 on the left side, and the tooth 22a keeps the tooth 21d of the plate 21 in the initial position. With its shape and position, the disconnecting tongue 25 prevents the rotation of the rotational disc 22 driven by the helical spring 23. After the disconnecting tongue 25 has been mechanically disconnected or retracted, the helical spring 23 moves the rotational disc 22 from the initial position to the end position. Due to its special shape the rotational disc 22 pushes at the upper side the visual indicator and at the lower side the lock of the indication into the final position in a way that the cylindrical lug 22d moves the button 26 to the right side, and the tooth 22a disengages from the tooth 21 d of the plate 21 and the latter moves to the right. The rotational disc simultaneously covers the disconnection area.

The solution of electronic signalisation is carried out by a transfer of mechanical movement from the rotational circuit breaker assembly in the module to the assembly of the micro switch 7, the indication pin 63, the printed circuit 3 and two pressure springs 4 and 5 in the base part 1 of the surge protective device. In the initial position, when the active module 2 is inserted in the base part 1 , the indication pin 63 is pressed with the side wall 21 a of the plate 21 and consequently the micro switch 7 is activated. When in this position, the module of the surge protective device is in the operative state and present. Immediately when disconnection occurs in the module 2 and consequently the rotational disc 22 moves, the indication lock or the plate 21 moves to the extreme left position with respect to Figure 2, thus allowing the indication pin 63, which is driven from below by two pressure springs 4 and 5, a free path upwards. The pin 63 of the actuator 6 gets positioned in the round hole 21 b of the plate 21 , and this movement of the actuator 6 releases the switch 7a of the micro switch 7, which causes deactivation of the micro switch 7 and consequently a change in the signal on the state of the surge protective module 2. The signalisation of disconnection and control of the state of the module 2 in the base part 1 is herewith solved. The solution can be embodied for the base part designed for one, two, three, four, five, six, seven or eight modules. The printed circuit board changes in accordance with the number of modules. The shapes of printed circuit boards for one, two, three and four modules are shown in Figure 7, and the shape for eight modules is shown in Figure 8. The solution of the invention is also suitable for variants of wider modules, wherein there is a change in the shape and size of printed circuit boards and also in other component parts and an _. adequate quantity of micro switches. Each pole is allocated an independent micro switch, wherewith an unfavourable transfer of movement by third elements to one common micro switch is avoided.