AT2870U1 - PROTECTIVE DEVICE - Google Patents

Abstract

Protective device, residual current device, miniature circuit breaker or the like, with memory element. Protective device, residual current device, miniature circuit breaker or the like, which works with contacts or switch contacts - a switch lock and / or a tripping device and / or a test or monitoring device, and against thermal Overload is protected. It is provided that a memory element (1, 3, 4, 5, 7, 8, 9), hereinafter referred to as the M element, is made of metal or plastic with a sudden change in shape at a shape change temperature that can be used as a limit temperature, and in the existing switch-off chain is arranged in such a way that a disengaging intervention takes place due to a change in shape at the change in temperature.

Description

AT 002 870 Ul

The invention relates to a protective device, residual current device, a circuit breaker or the like, which works with contacts or switch contacts - a switch lock - and / or a trigger device - and / or a test or monitoring device,

Id and the " is protected against thermal overload.

In the case of protective switching devices designed as line protection switches, thermal tripping devices, for example bimetal elements, are common. In the case of protective switching devices designed as residual current circuit breakers or as residual current circuit breakers, it is known to connect a temperature-dependent switching element in a heat-conducting manner to the summation current transformer (DE-A-1 588 723). When the intended limit temperature is reached, a resistance of a test device is applied to generate a fault current.

The object of the invention is to develop an electrical protective device of the type described at the outset, which is itself protected against thermal overload according to a universally applicable principle.

The described task is solved by a protective device according to claim 1. According to this, a memory element, hereinafter referred to as an M element, is made of metal or plastic with a sudden change in shape at a shape change temperature that can be used as a limit temperature, and in the existing shutdown chain arranged that a shutdown takes place by changing the shape at the shape change temperature. With all protective devices, or in the following also installation devices, which have a switch-off chain made of functional links, one of the 2 AT 002 870 Ul

Arrange function elements an appropriately designed M element so that the shutdown chain is activated.

In this way, in the case of residual current protective devices, mains voltage independence can be ensured without electronic power supplies or electronic circuits.

This makes it unnecessary, for example, to design the electrical system * separately, taking into account the expected load in individual cases. The triggering element, the M element, does not require any components through which current flows. The existing components are largely sufficient. For example, the Austrian installation regulations ÖVE-EN 1, Part 1 in Section 12.12 require that residual current protective devices be specially protected against thermal overload.

In general, an M-element in the form of a bending arm or bimetallic strip can be arranged in an installation device with a switch lock and unlatching device, for example in the case of a residual current circuit breaker or line circuit breaker, in such a way that it has a unlatching effect when the shape changes.

In the case of a tripping device, for example a residual current circuit breaker, residual current circuit breaker or circuit breaker, the M element can be arranged in the form of an armature spring in such a way that it actuates the tripping device when the shape changes.

In the case of a residual current circuit breaker or residual current circuit breaker with a holding magnet release and armature spring, the armature spring can be made as an M element in such a way that the armature spring contracts at the temperature change temperature, whereby the triggering is initiated. One can also mechanically parallel to the anchor spring a tensile body as M- 3 AT 002 870 Ul

Arrange the element, the tensile body being manufactured in such a way that it contracts at the temperature change. It is then no longer necessary to manufacture the more complex anchor spring as an M element. In the case of a circuit breaker with a tripping device, a spring washer with a snap function can be designed as an M element, which is arranged in such a way that the kinematics of the tripping device are acted upon at the change in shape.

In the case of a residual current circuit breaker or residual current circuit breaker with a holding magnet release, an M-element in the form of a plastic pressure element can be arranged in such a way that it has an opening effect on the kinematics of the holding magnet release at the shape change temperature. A plastic pressure body can be arranged under the armature plate in the holding magnet release so that the plastic pressure body opens or pushes the armature plate open at the change in shape.

In the case of a residual current device or residual current device with a test device and test button that can close a test contact path, an M element in the form of a test contact spring can be arranged in such a way that the test contact path is closed at the change in shape temperature so that the flowing test current triggers the protective device. The test contact of the test contact path can also be designed as an M element in such a way that the test contact path is closed at the change in shape temperature.

The invention will now be explained in greater detail on the basis of examples shown roughly schematically in the drawing:

FIG. 1 shows a side view of an installation device in the form of a switching device, for example a residual current circuit breaker, with the latch release device being released, an M element being used in the form of a bending arm. 4 AT 002 870 Ul

Figures 2 to 5 show tripping devices in the manner of holding magnet triggers, which are protected in various ways by M elements against thermal overload:

In Figure 2, the armature spring is designed as an M element, which contracts at the change in shape temperature.

In Figure 3, a tensile body is arranged as an M element mechanically parallel to an ordinary armature spring.

An M element in the form of a snap disk is used in FIG.

A further exemplary embodiment is illustrated in FIG. 5 with the aid of an opened trigger device, according to which the anchor plate can be lifted off by a plastic pressure element as an M element.

FIG. 6 illustrates a test button with a test contact path for a residual current circuit breaker, in which the test contact spring is designed as an M element.

In FIG. 7, the test contact device according to FIG. 6 is modified in such a way that the test contact 9 itself is designed as an M element which expands at the change in shape temperature until the test contact spring is at rest.

The switching lock with unlatching device according to Figure 1 has in the unlatching device with the half-wave 2 an M-element in the form of a bending arm 1, which moves in the direction 1 'at the shape change temperature and raises the half-wave 2 to position 2', in which one Pawl can fall off the half-wave 2.

FIGS. 2 to 5 each show a triggering device of an installation device in the manner of a holding magnet trigger for residual current protective devices, residual current circuit breakers or residual current circuit breakers, *. The functional principle of the triggering device can be seen from the illustration of an opened triggering device according to FIG. 5. If the premagnetization is largely compensated for by a triggering current, an armature plate 6 drops under the action of an armature spring 3, as a result of which a switch lock can be unlatched in the switch-off chain, which leads to the opening of switch contacts and to switch-off.

In the release device according to FIG. 2, the M element in the form of an armature spring 3 has a triggering effect on the release device when the shape changes, in that the armature spring contracts and the armature plate 6 - see FIG. 5 - is lifted off. In the exemplary embodiment according to FIG. 3, the triggering device has a tensile element 4 made of M element mechanically connected in parallel with the armature spring 3. The tension member Jij is designed such that it contracts at the temperature of the deformation. With correspondingly modified kinematics, it is also possible to work with an M element that expands.

In the triggering device according to FIG. 4, an M element in the form of a roughly schematically represented snap disc 5 acts on the trigger lever, which is also acted upon by the armature spring 3.

In the release device according to FIG. 5, a plastic pressure element 7 is arranged in such a way that it has an opening effect on the kinematics of the holding magnet release at the change in shape temperature by gripping under the armature plate 6 as it expands and lifting it open.

In the case of a residual current circuit breaker or residual current circuit breaker which has a test device with a test button which can close a test contact path, an M element in the form of a test contact spring 8 is arranged in the exemplary embodiment according to FIG. 6. It is arranged in such a way that the test contact path b to the test contact 9 is closed at the shape change temperature. The test button T of a residual current device acts on the test contact spring 8. In the exemplary embodiment according to FIG. 7, the test contact 9 itself is designed as an M element, which extends up to the test contact spring 8 at the change in shape temperature. The test contact path b is overcome in a contact-making manner.

It is in your hand to design M elements so that they

either contract at the shape change temperature or contract. The properties depend on the production method. Both types of M elements are on the

Market. 7

Claims (10)

AT 002 870 Ul Claims 1. Protective device, residual current device, miniature circuit breaker or the like, which works with contacts or switch contacts - a switch lock - and / or a triggering device - and / or a test or monitoring device, each. and dgtßf is protected against thermal overload, characterized in that a memory element (1, 3; 4/5/7, '8,' 9), hereinafter referred to as M-element, made of metal or plastic with a sudden change in shape at a usable as a limit temperature Shape change temperature is produced in such a way and is arranged in the existing switch-off chain in such a way that a switch-off intervention takes place due to shape change at the shape change temperature. 2. Protection device according to claim 1, characterized in that an M-element in the form of a bending arm (1) or bimetallic strip is arranged in a switch lock with a release device, for example in a residual current circuit breaker or circuit breaker, so that it acts in a decoupling manner when the shape changes . 3. Protection device according to claim 1, characterized in that in a triggering device, for example in a residual current circuit breaker, residual current circuit breaker or Lei- 8 AT 002 870 Ul tion protection switch, an M-element in the form of an armature spring (3) is arranged so that it changes the shape Trigger device actuated. 4. Protection device according to claim 3, characterized in that in a residual current circuit breaker or residual current circuit breaker with holding magnet release and armature spring (3), the armature spring is made as an M element such that the armature spring (3) contracts at the change in shape temperature. 5. Protective device according to claim 3, characterized in that in a residual current device or residual current device with a magnetic release and armature spring (3) mechanically parallel to the armature spring (3), a tensile member (4) is arranged as an M element, the tensile member being made in such a way that it contracts at the strain temperature. 6. Protection device according to claim 3, characterized in that a spring washer (5) with a snap function is designed as an M-element in a switch lock with triggering device and is arranged such that it has a triggering effect on the kinematics of the triggering device in the shape change temperature. 9 AT 002 870 Ul 7. Protection device according to claim 3, characterized in that an M-element in the form of a plastic pressure body (7) is arranged in a fault protection device or in a differential current device with a holding magnet release such that it acts opening at the change in shape on the kinematics of the holding magnet release. 8. Protection device according to claim 7, characterized in that the plastic pressure element (7) is arranged in the holding magnet release under its anchor plate so that the plastic pressure element (7) at the change in shape, the armature plate (6) lifts open. 9. Protection device according to claim 1, characterized in that an M element in the form of a test contact spring is arranged in a residual current device or a differential current device having a test device with test button (T) which can close a test contact path (b) is that the test contact path (b) is closed at the shape change temperature. 10. Protection device according to claim 9, characterized in that a test contact (9) is designed as an M element such that the test contact path (b) is closed at the shape change temperature. 10th