RU1814103C - Automatic switch - Google Patents

Abstract

The invention relates to electrical apparatuses. The purpose of the invention is to simplify the design, increase the reliability and service life of circuit breakers due to the fact that the switching device acting as a free trip mechanism is made in the form of a pusher and a plate-rail. 2 ill.

Description

FIELD OF THE INVENTION This invention relates to electrical apparatuses, in particular, circuit breakers designed to automatically turn off electrical circuits during short circuits and overloads.

The purpose of the invention is to simplify the design, increase the reliability and service life of the circuit breaker.

The goal is achieved in that the switching device, which performs the function of a free trip mechanism, is made in the form of a pusher with a breaking spring and a plate-rail. The closing device turns off the circuit breaker, since in the initial state, when the pusher does not interact with the contacts, the contacts of the circuit breaker are closed,

In said device, the switching device ensures independence of the contact failure from the trip mechanism of the switching device and the constant contact failure.

Figure 1 shows a circuit breaker, a vertical section; figure 2 - including device.

The circuit breaker consists of a base 1, to which the cover 2 is attached. On the base there is a conductor 3 of fixed contacts and a movable contact 4. Contact pressing is provided by a contact spring 5. On the base 1, an arcing chamber 6 is installed. The switching device consists of a push rod 7, disconnecting springs 8 and handles 9. A thermal release 10 and an electromagnetic release 11 are installed on the current lead 3.

The inclusion device is presented in figure 2. The structure of the disconnecting device, in addition to the pusher 7, the disconnecting spring 8 and the handle 9, includes a plate-rail 12.

The circuit breaker operates as follows. In the initial state, when the pusher 7 of the switching device does not interact with the movable contact 4, the contacts 3 and 4 are closed. For

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To quickly open the contacts (turn off the switch), it is necessary to turn the handle 9, which drives the pusher 7, which, in contact with the movable contact 4, breaks the contacts.

To turn on the switch, it is necessary to return the handle 9 to its original position. In this case, the pusher 7 rises upward under the action of the elasticity of the plastic strip 12 (Fig. 2), releasing the movable contact 4, which closes the current lead 3 of the switch under the action of the contact spring 5.

In case of emergency shutdowns, when the thermal release 10 or electromagnetic release 11 is triggered, the plate-rail 12 is released when the release 10 or 11 is exposed to it, and the pusher 7, under the action of the breaking spring 8, opens the contact 4 of the switch,.,: ....: . .

Simplification of the design is achieved by the fact that the switching device, which also performs the functions of the free flow mechanism

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chaining, has the simplest design, since there are no traditional rods and axles.

Improving the reliability and service life of the circuit breaker is ensured by the fact that:

1) as the contacts wear, the contact dip practically does not change, i.e. contact touch supported;

2} wear of the parts of the switching device does not affect the failure and contact pressing of the contacts,

Claims (1)

Formula and shade of shade A circuit breaker comprising a base, a cover including a device kinematically connected to a contact system, an arcing system, a thermal release and an overcurrent release, characterized in that, in order to simplify the design, increase the reliability and service life of the circuit breaker, the switching device is made in the form of a sense atel with a breaking spring and a plate-rail, Phage 1 figure 2