DE400146C - Circuit breaker with a conductor connected in parallel to the tripping device with a high positive temperature coefficient - Google Patents

Description

Circuit breaker with a conductor connected in parallel to the release device with a high positive temperature coefficient. The previously known high-current circuit breakers, which are designed in the form of melting plugs and are intended to replace them suffer, especially if they have electromagnetic triggering, from the lack of one too quick effect. If z. B. a larger number of metal wire lamps at the same time or a motor with a high starting current is switched on, it works when it is switched on instantaneous current surge unintentionally tripping the switch while a fusible plug a short-term overload due to the heat capacity of the fusible wire tolerates.

There is therefore a need for automatic switches with switching delay to manufacture. The running or braking mechanisms that are common with larger apparatuses are, however Cannot be used for switches in plug form, as there is no space available stands. According to the invention, the release device is a wire with a high temperature coefficient, z. B. an iron wire, connected in parallel, which in the cold state a large part of the current. The resistance only increases with prolonged overload of the wire so strong that now a stronger branch current flows through the coil and triggers the switch. By sizing the conductor it is possible to give the self-switch any desired delay in the simplest possible way give.

The parallel connection of a conductor with a high temperature coefficient to the trip coil of a circuit breaker for the purpose described is already in itself known. However, this arrangement does not offer any for the usual larger devices special advantages, since the same end by different means in a perfect way is achieved.

It is also known that in fuse plugs a wire with high Temperature coefficient is placed in the plug, which is usually then also serves as a fuse wire. Here, however, the wire fulfills other conditions, because it is used as a fuse wire. The invention consists in the application the known arrangement on automatic switch in plug form, in which the intended purpose is to be achieved in the simplest possible way.

The execution is particularly simple if, as in the case of the present one Invention, the way is chosen to design the porcelain body (steatite or the like) so that in him, d. H. in special recesses of its interior or its surface, the device for delaying the switching process is accommodated. If the room is selected accordingly for the switching device inside the plug, so can the delay conductor can be brought into this room, if necessary on a rib body.

By placing them in recesses or elevations in the porcelain (Steatite o. The like.) Three things are achieved a comfortable insulation of the conductor, one space-saving, easy to connect with the other parts of the housing; at last it becomes possible through location, form and wall thickness or width of a specially attached opening that consists of a continuous slot or individual Holes can exist that affect the temperature of the conductor.

The heat absorption can also be achieved by filling in the areas containing the wire Porcelain cover with sand or the like or special putty. Even by ribs the heat capacity can be influenced.

Claims (3)

PATENT CLAIMS: i. Automatic switch with parallel to the release device switched conductor with a high positive temperature coefficient, characterized in that, that the conductor in closed or open channels in the wall of a fuse body is embedded in the plug shape. 2. circuit breaker according to claim i, characterized in that that the channels run in a ring or spiral. 3. circuit breaker according to claim i or 2, characterized in that the channels depending on the desired cooling of the conductor are sized or arranged or provided with filler material.