SI21153A - Varistor fuse - Google Patents

Abstract

Subject of the invention is a varistor fuse which consists of a varistor, a current and thermal fuse, and is used in systems for protecting electric power devices against overcurrent (lightning) and increased currents. The varistor fuse according to the invention features two varistor electrodes (2, 3) on the internal and external part of the insulating body (1), while inside the insulated body (1) there is a current (4) and thermal (5) protection immersed in slaked material (6).

Description

VARISTOR'S SECURITY INSERT

The subject of the invention is a varistor circuit breaker, which consists of a varistor, a current and a thermal fuse, and is used in the system of protection of electric power devices against surges (lightning) and high currents. The invention belongs to class H 01C 07/10 of the international patent classification.

A technical problem that is successfully solved by the design of a varistor protection cartridge is the implementation of such an element that will react quickly to electrically damaging impacts and will be able to be installed in existing wiring housings.

Known solutions for the protection elements of electrical devices and electronic circuits against surges, high currents, or overheating solve individual protection partially. Thus, there are a number of differently shaped varistors that protect the first position of the electrical device from overvoltage, different designs of overcurrent protection through the circuit at the second position, and protection elements that shut off power at an elevated temperature at the third position. All of these elements are designed only to protect the abnormal condition in its position. The disadvantage of such safety elements is the slow response of interdependent parameters. This can lead to certain defects in the elements themselves as well as in the security devices.

The varistor protection insert according to the invention has varistor electrodes on the inside and outside of the insulating body and a current and thermal protection enclosed in the insulating body, surrounded by extinguishing material.

The invention will be explained in more detail on the basis of an embodiment and accompanying drawings, of which:

Fig. 1 is a schematic diagram of a varistor protection insert according to the invention;

Fig. 2 is a schematic view of a cross-sectional view of a varistor protection insert according to the invention;

Figure 2 is a schematic representation of a varistor protection insert according to the invention. It consists of an insulating body 1 having electrodes 2 and 3 of the varistor in the inner and outer parts, and in the insulating body 1 there is a current protection 4 and a thermal protection 5 surrounded by extinguishing material 6, while on one and the other side of the insulating body 1 implemented input contacts 7 and output contacts 8 and, if necessary, intermediate contacts 9.

The electrodes 2 and 3 of the varistor are implemented in a known manner on a part of the outer and inner surfaces of body 1. The input contact 7 and the output contact 8 are metal parts mounted on one and the other side of the body 1. If necessary, an intermediate contact is made on the one hand 9. Current protection 7 is connected between the input contact 7 and the output contact 8, e.g. reduced conductor wire shape and thermal protection 8, e.g. bonded wire with a material that allows disconnection at elevated temperature.

The shape of the body 1 can be adjusted so that it is possible to use the varistor guard insert according to the invention in all standard safety element housings. In this way, virtually a single guard insert io provides protection in all three positions, which enables rapid reaction to electrically damaging shocks and, on the other, rationalization in the dimensioning and number of enclosure housings.

For:

ALFA & OMEGA, d.o.o.

Claims (1)

1. A varistor protection insert, characterized in that 5 that electrodes (2, 3) of the varistor are made on the inner and outer part of the insulating body (1), and in the insulating body (1) there is a current protection (4) and a thermal protection (5), surrounded by extinguishing material (6), meanwhile when input contacts (7) are made on one side of the insulating body (1) and output contacts (8) on the other side of the insulating body (1) and, if necessary, an intermediate contact (9).