JPS5850587Y2 - circuit break - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in the terminal structure of a circuit breaker.

In a circuit breaker, the terminal that connects the external conductor of the circuit breaker with a large current carrying capacity must have a large cross-sectional area so as not to exceed the temperature rise value specified in the equipment standard.
Circuit breakers, which are required to be small and compact, have limitations in terms of width, so conventionally the current-carrying part of the terminal has been made thicker to reduce the current density.

In Figures 1 and 2, 1 is the circuit breaker body, 2
, 2' are internal conductors of the circuit breaker main body 1, and 3, 3' are terminals fixed to the internal conductors 2, 2' with screws so as to protrude from the back surface of the circuit breaker main body 1.

The terminal 3 is formed by casting, die forging, and machining a conductive material as shown in Fig. 3, or by machining a plate of a conductive material and silver soldering as shown in Fig. 4. Ta.

Therefore, in order to increase the current-carrying capacity, the current-carrying portion must be made thicker.

The object of the present invention is to provide a circuit breaker in which the terminals are made of thin plates of conductive material and bent to increase the surface area and have an economical structure with a large current carrying capacity.

An embodiment of the present invention shown in the drawings will be described below.

Fig. 5 shows a terminal 3 in which two terminals 3a are bent in an L-shape by pressing a thin plate of conductive material so that the bending radius of the bent portion 3b is increased, and the terminals 3a are placed facing each other. A screw connection is made to the conductor, and a screw connection is made to the outer conductor at hole 5.

The bent portion 3b of the terminal 3a is curved with as large a bending radius as possible, so when it is attached to the internal conductor 2, there will be a gap between the internal conductor 2 and the terminal 3a, so the overall The cooling surface area increases, and the current carrying capacity of the terminal 3 can be increased.

Also, by arranging the holes 4 in a square shape, the terminals 3 can be bent at 90°.
It can be rotated and attached to the inner conductor 2.

Furthermore, by attaching only one of the terminals 3a to the inner conductor 2, circuit breakers of the same frame size can be used for lower rated currents.

Figure 6 shows another embodiment, in which the terminal 3a is made by bending a thin plate of conductive material with an L-shaped bent part to form an inclined surface 3C and minimizing the contact surface between the two mating surfaces, thereby reducing the cooling surface area. It's a big one.

FIG. 7 shows another embodiment in which the terminal 3a has a folded portion 3d that curves outward between the L-shaped bent portion and the contact surface with the external conductor to increase the cooling surface area. be.

As described above, in this invention, the terminal of a circuit breaker is made of two thin plates facing each other, and the parts other than the connecting part are bent to create a gap.This gap increases the cooling surface area and has a cooling effect. As a result, the thickness of the conductive part can be reduced.

Also, you can make two pieces of the same shape and place them facing each other, and you can also make 9
It can be installed by rotating it by 0°, and the number of terminals can be increased or decreased relative to the rated current, making standardization easy.

In addition, since it is a thin plate, it is possible to make terminals with various shapes, which has the advantage of being economical.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing a general circuit breaker, Fig. 2 is a longitudinal sectional view taken along line A-A in Fig. 1, and Figs. 3 and 4 are respectively of a conventional circuit breaker. FIG. 5 is a perspective view showing one embodiment of the terminal of the circuit breaker of the present invention, and FIGS. 6 and 7 are perspective views showing other embodiments. 1... Circuit breaker body, 2... Internal conductor, 3... Terminal.

Claims (1)

[Scope of utility model registration request] It consists of a circuit breaker main body and a terminal attached to the circuit breaker main body to connect an external conductor.The terminal consists of two thin plates bent in an L shape facing each other, and the part other than the connecting part bent to form a gap. A circuit breaker characterized by being provided with.