JPH03190030A - Circuit breaker - Google Patents

Abstract

PURPOSE:To enable adjustment of a size of a through hole to eliminate need of a spacer by providing stepped parts for allowing the through hole of a lid of a breaker to be increased in size according to a terminal member, and forming a cut groove between adjacent stepped parts. CONSTITUTION:A plurality of stepped parts 171 for allowing a through hole 17a of a lid 17 of a breaker to be increased in size along the direction of plate thickness according to the thickness of a plate of a terminal member are provided on one side of the through hole 17a, and a cut groove 172 is formed between the adjacent stepped parts. A breaker with large rated current and with plate thickness of the terminal member corresponding to l2 is to be assembled, the stepped part 171a is cut from the cut groove 172 and the lid 17 with the size of the hole 17a increased to l2 is used. By further removing the stepped part 171 from the cut groove 172, the size along the plate thickness direction of the terminal member can be increased to l3. Thus the size of the through hole can be adjusted and a spacer is not necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the terminal portion of a circuit breaker.

[Prior Art] Figures 4 to 6 show conventional circuit breakers. In the figure ([) is the casing, base (IA), cover (IB)
It consists of (2) is a cutoff part, and (3) is a power supply side terminal part. (4) is a terminal member with a fixed contact (
5), the other end of which is connected to an external conductor (not shown). The terminal member (4) has a plate thickness (cross-sectional area) that changes depending on the magnitude of the rated current. For this purpose, the base (IA) is provided with a hole (1a) through which the terminal member (4) having the maximum thickness can pass through. For example, when the rated current is small, a thin plate is used as the terminal member (4), so the base (IA)
There will be a gap between the two. (6) is an auxiliary metal fitting for attaching the terminal member (4) to the base (IA), and is designed to eliminate the above-mentioned gap. The auxiliary metal fitting (6) is attached to the terminal member (4) with a screw (7). The power supply side terminal section (3) consisting of the terminal member (4), fixed contact (5), auxiliary fitting (6), etc. is attached to the base (LA) with a thread 8).

(9) is a movable element having a movable contact (lO) at one end thereof opposite to the fixed contact (5). (11) is a shunt (copper stranded wire) with captivating properties, and the movable element (9)
and the load side terminal member (12).

The terminal member (12), the shunt (11) and the terminal member mounting member mounting bracket (13) are attached to the base (IA) with screws (15). (16) is attached to the terminal member (12) with a spacer, and the terminal member (12) is connected to the terminal member through hole (17a) of the lid (17), which will be described later.
) is designed to eliminate the gap. (18) is a contact pressure spring, and (19) is a CT inserted into the load-side terminal member (12), which detects the current flowing in the circuit and sends a signal to a tripping device (not shown) to interrupt the circuit. The lid (17) is made of an insulating material, and is attached to the base (IA) with screws (20) so that the CT (19) can be easily attached and detached from the outside and cannot be touched. The lid (17) has a through hole (17a) approximately in the center thereof, into which the load-side terminal member (12) is inserted. The through hole (17a) is large enough to allow the terminal member (12) with the maximum plate thickness to be inserted therethrough, similar to the hole (1a) for inserting the power supply side terminal member (4) provided in the base (IA). It is formed.

The movable element (9) is configured to open and close using an opening and closing mechanism (not shown).

[Problem to be solved by the invention] Since the conventional circuit breaker is configured as described above,
Depending on the rated current of the circuit breaker, the terminal member (12
) changes, the thickness of the terminal member (12) is thin when the rated current is small (and a gap is created. Because of this, foreign matter may get mixed in through the gap and scratch the CT (19). Therefore, the gap was
(16) is used. Furthermore, it is necessary to change the thickness of the spacer (16) depending on the magnitude of the rated current, which increases the number of types of parts.

Furthermore, there were other drawbacks such as the necessity of attaching the spacer (16) to the terminal member (12).

This invention has been made to solve the problems of the prior art as described above, and aims to provide a circuit breaker that is easy to assemble by eliminating the need for spacers and reducing the number of types of parts.

[Means for Solving the Problems] A circuit breaker according to the present invention has a plurality of step portions that can widen the size of the through hole of the lid according to the terminal member, and has a plurality of step portions that are cut between adjacent step portions. It is configured to have a groove.

[Function] The lid according to the present invention has a stepped portion that can increase the size of the through hole according to the terminal member, and also has a cut groove between adjacent stepped portions, so that the size of the through hole can be increased. It is adjustable and eliminates the need for a spacer.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, (17) is a lid, and a through hole (17a
) is provided. The - side of the through hole (17a) has a dimension e or ρ3 in the thickness direction depending on the thickness of the terminal member.
It has a plurality of steps (171) that can be expanded to (ρ+< (lt , a cut groove (172) is provided from the back side. (12) is a terminal member on the load side, and a shunt (11) and a terminal member mounting bracket (13) are attached as in the conventional device. Other symbols are the same as those in the conventional device, so explanations will be omitted.

In the above configuration, when assembling a circuit breaker whose rated current is thicker than the one in Figure 1 (for example, the thickness of the terminal member (12) corresponds to item 4 in Figure 3), it is necessary to A lid may be used in which the step (171a) is cut out from the groove (172a) and the through hole (17a) is enlarged to a size e.

Similarly, from the kerf (172b) to the step (171b)
By cutting out the thickness direction of the terminal member, e
It can be expanded to 3.

In this way, according to the above embodiment, the dimensions of the through hole (17a) can be changed in three steps depending on the terminal member, so the spacer that was conventionally required is no longer necessary, and the number of parts can be reduced. Further, since the work of assembling the spacer is not required, assembly becomes easy.

In the above embodiment, the size of the through hole (17a) is adjusted in three stages, but the same effect can be obtained even if the size of the through hole (17a) is adjusted in two stages or four stages or more.

In addition, although the size of the step portion (171) is configured such that the step portion (171a) located inside the through hole (17a) is successively smaller than the step portion (171c) located outside the through hole (17a), the size is not necessarily limited to this. It's not a thing. Although the cut grooves (172) are provided on both sides of the lid (17), they may be provided only on the negative side.

[Effects of the Invention] As described above, according to the present invention, the through hole through which the terminal member is inserted is configured to use a lid that can be expanded according to the cross-sectional area of the terminal member, so that no spacer is required. This has the effect of providing a circuit breaker that is easy to assemble.

[Brief explanation of drawings]

Member: (17) is the lid, (17a) is the through hole, (171)
is a stepped portion, and (172) is a kerf. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a blocking section disposed inside a housing; a terminal member provided penetrating the inside and outside of the housing and connected to the blocking section;
In a circuit breaker having a through hole and a lid fixed to the housing by inserting the terminal member into the through hole, the size of the through hole in the lid is determined by the cross-sectional area of the terminal member. 1. A circuit breaker characterized by having a plurality of step portions that can be widened according to the amount of time, and having grooves provided between adjacent step portions.