RU66115U1 - CIRCUIT BREAKER - Google Patents

Abstract

The device relates to electrical engineering and is intended to increase the reliability and manufacturability of circuit breakers. The pole of the circuit breaker is made of several (two or more) common-type low-ampere circuit breakers controlled by a common handle, the corresponding terminals of which are connected in parallel using connecting elements. The mechanisms of free uncoupling of small-current circuit breakers are interconnected by a disconnecting rail, a clip for connecting external conductors of the corresponding cross section is placed on each connecting element, the screw holes in the terminals of small-current circuit breakers are closed with plugs. This embodiment of one pole of a circuit breaker increases its reliability, improves manufacturability, and extends operational capabilities.

Description

1. The technical field to which the utility model relates.

The utility model relates to electrical engineering, in particular, to maximum protective circuit breakers with electrothermal (thermal) and electromagnetic automatic opening, in which the contacts open automatically with excess current.

2. The level of technology

Known circuit breakers with electrothermal (thermal) and electromagnetic releases, which automatically open the contacts, for example, according to the patent for the invention No. 21115975. An analogue of the claimed utility model can be considered a circuit breaker according to the patent for utility model No. 53815. According to a known technical solution, the contact system in each pole is divided into two parallel parts, each of which has its own arcing system, with each pole having one common thermal and electromagnetic overcurrent release.

The disadvantage of this analogue is that the current distribution between the parallel parts will be unequal due to the spread of the resistance of the contact pairs, which will lead to a decrease in the reliability of the circuit breaker.

3. Disclosure of utility model

The main task, the solution of which the claimed utility model is directed, is to increase the reliability of the circuit breaker. To this end, each pole of the circuit breaker is made of several (two or more) single-type small-ampere circuit breakers controlled by a common handle with thermal and electromagnetic automatic opening, corresponding to

the findings of which are connected in parallel with the help of connecting elements.

4. Brief Description of the Drawings

The figure 1 presents a drawing of a possible variant of one pole of the proposed circuit breaker.

On the figure:

1, 2 - low-amp circuit breakers with thermal and electromagnetic automatic opening;

3 - common handle;

4, 5 - connecting elements;

6, 7 - clamps for external conductors;

8-11 - plugs of holes for access to terminal screws in small-amp circuit breakers.

5. Implementation of a utility model

The pole of the circuit breaker consists of two (or more) small-ampere circuit breakers with thermal and electromagnetic automatic opening 1, 2 with a common handle 3. The terminals of the switches for connecting external conductors are connected by connecting elements 4, 5, which may contain clamps 6, 7 for connecting large conductors sections. The openings for accessing the terminal screws in the low-current circuit breakers can be closed with plugs 8-11.

With closed contacts, current flows in parallel parts - low-amp circuit breakers, the corresponding terminals of which are connected by connecting elements. Since each small-current circuit breaker has its own thermal and electromagnetic releases, which are identical and have a resistance much higher than the resistance of contact pairs, the current between them will be distributed evenly, which will increase the reliability of the circuit breaker.

The implementation of each pole of the switch from several (two or more) of the same type of low-amp circuit breakers will increase the manufacturability of production (no production of a new set of parts and assemblies is required).

To reduce the dispersion between the moments of opening of the contacts at maximum current, the mechanisms of free uncoupling of the small-current circuit breakers can be interconnected by a trip rail (not shown in the figure), which will also increase the reliability and wear resistance of the circuit breakers.

The connecting elements can have clamps for connecting external conductors of the appropriate section, which will expand their functionality.

The screw holes in the terminals of the small-current circuit breakers can be closed with plugs, which makes it difficult to access the terminals of the internal circuit breaker, which will increase electrical and fire safety.

Thus, the reliability of the circuit breaker increases, its manufacturability improves, and its operational capabilities expand.

Claims (4)

1. Automatic circuit breaker with thermal and electromagnetic releases, characterized in that each pole is made of several (two or more) single-type small-ampere circuit breakers controlled by a common handle, the corresponding terminals of which are connected in parallel using connecting elements. 2. The switch according to claim 1, characterized in that the mechanisms of free uncoupling of the small-ampere circuit breakers are interconnected by a trip rail. 3. The switch according to any one of claims 1 or 2, characterized in that on each connecting element there is a clip for connecting external conductors of the corresponding section. 4. The switch according to claim 1, characterized in that the screw holes in the terminals of the small ampere switches are closed with plugs.