JPH0112757Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a closed-envelope type circuit breakers and breakers composed of a molded base and a molded cover made of an insulating material. It is an object of the present invention to provide an improved circuit and disconnector which can be easily attached to either a connecting terminal conductor or a surface connecting terminal conductor.

Generally, in this type of circuit breakers and disconnectors with relatively small current capacity, the main fixed conductor is extended inside the closure jacket and exposed from the side end of the closure jacket, and this exposed part is As a surface connection terminal conductor, in the case of back connection, it is configured to be connected to the back connection terminal conductor in a direction perpendicular to the front surface connection terminal conductor,
As the current capacity increases, the cross-sectional area of the main fixed conductor on the fixed contact side and the arc extinguishing device become larger. Extending the conductor through the closure envelope and exposing it as a surface connection terminal conductor from the side end of the closure jacket causes the circuit and disconnector to become larger. Therefore, if the connection method is limited to back side connection, this configuration increases the amount of copper in the main fixed conductor and is not economical. A device in which the back side connection terminal conductor is made to protrude through the hole has been implemented. However, due to the direction of introduction of the external conductor,
In some cases, a device having a surface connection terminal conductor is required, and a device having only a back surface connection terminal conductor has the drawback that such a request cannot be easily met.

Therefore, this invention takes advantage of the miniaturization and economical advantages of the circuit and disconnector dedicated to the back connection terminal conductor, and allows easy installation by selecting either the back connection terminal conductor or the front connection terminal conductor. The present invention provides a circuit breaker and a disconnector. Note that this problem does not exist in the terminal on the side that does not have an arc extinguishing chamber, since the main circuit conductor required for the structure is necessarily led out almost to the end of the mold base.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The circuit and disconnector of this invention will be described below with reference to the accompanying drawings showing embodiments thereof.

FIG. 1 shows a closed type circuit breaker equipped with back side connection terminal conductors, and an insulating box is formed by a mold base 1 and a mold cover 2 made of an insulating material. The main fixed conductor 3 is the mold base 1
The main fixed contact 4 and the arc runner 5 are attached to the upper surface of the main fixed contact 4, and the arc fixed contact 6 is attached to the arc runner 5. A back connection terminal conductor 7 is removably attached to the exposed portion of the bottom surface of the main fixed conductor 3 and led out in a right angle direction.

It projects from the vicinity of the opening 1a of the bottom wall of the mold base to the back side of the bottom wall so as to be at approximately the same height as the central bottom wall protrusion 1b, and partitions each pole extending toward the side edge of the closure jacket. Groove wall 1c forming a groove
are integrally formed.

The movable contact rod 8 is provided with a main movable contact 9 corresponding to the main fixed contact 4 and a movable arc contact 10 corresponding to the arc fixed contact 6 at one end thereof, and a flexible conductor 11 at the other end. It is connected to the fixed conductor 12 via. Current transformer penetrating fixed conductor 13
are integrally connected to the upper surface of the fixed conductor 12,
The terminal fixed conductor 14 is connected by contacting the lower surface of the current transformer penetrating fixed conductor 13, and a back connecting terminal conductor 7' is detachably attached to the back side, and the back connecting terminal conductor 7' is connected in a right angle direction from the bottom wall. It is derived so that it stands out.

The opening/closing operation mechanism 15 of the circuit and disconnector of this invention is constructed as follows.

An operating handle 16 made of an insulating material is attached integrally with an opening/closing lever 18 rotatably supported on a frame shaft 17 fixed to a mold base 1 of the insulating container, and its tip protrudes from the mold cover 2. Toggle link 19 is another toggle link 2
0 via a pin 22, and the trip lever 21 via a pin 23. On the other hand, the toggle link 20 is connected to a contact holder 26 via a pin 25. An operating spring 24 is installed between the opening/closing lever 18 and the connecting pin 22 of the toggle link. The contact holders 26 are integrally connected by a cross bar 27 connected to the other poles, and are configured to simultaneously move the multi-pole contact holders to open and close positions using a contact holder rotation shaft 28 as a fulcrum. Further, a contact spring 29 is provided between the movable contact rod 8 and the contact holder 26, and the arc extinguishing device 30 includes a large number of arc extinguishing grids 31 made of magnetic material arranged in parallel.

The main hook 32, which forms part of the trip mechanism together with the trip lever 21, connects via a secondary hook 33 to a trip bar provided in a trip unit case 34 that accommodates a thermal and electromagnetic automatic trip overcurrent response device. It is releasably engaged with a locking pawl 36 of 35. Trip unit case 34
is formed from bisectable insulators and houses thermal and electromagnetic automatic trip overcurrent response devices. As is well known, this automatic tripping overcurrent response device includes a trip bar 35 having a locking pawl 36;
It is composed of a thermal bimetal 37, a current transformer 38, an instantaneous tripping electromagnet 39, and an instantaneous tripping rod 40.

Figure 2 shows the closed type circuit breaker shown in Figure 1, with the rear connection terminal conductor replaced with a surface connection terminal conductor.The differences from Figure 1 are explained below. , a mounting screw 41 for the connection between the exposed part of the main fixed conductor 3 from the bottom wall and the back connection terminal conductor 7;
42 and remove the back side connection terminal conductor 7, and make the front side connection terminal conductor 43 protrude from the vicinity of the bottom wall opening 1a to the back side of the bottom wall to form a groove partitioning each pole extending toward the side end of the closure jacket. It is arranged along the back surface of the bottom wall so as to fit within the groove wall 1b to be formed, and one end is attached to the exposed part of the main fixed conductor 3 using the mounting screws 41 and 42, and the other end is attached to the side of the closing jacket. It is fixed with a mounting screw 44 using an embedded nut 45 provided at the side end of the mold base 1 so as to protrude from the end. Furthermore, remove the back side connection terminal conductor 7' and the terminal fixed conductor 14 on the other side in FIG. The other end is made to protrude from inside the mold base to the side end.

As described above, this invention is designed to provide a closed circuit breaker with a relatively large current capacity, with an opening hole in the bottom wall of the mold base 1 that exposes the flat surface of the back of the switching contact part of the main fixed conductor 3. , integrally provided with a groove wall 1c forming a groove projecting from the vicinity of the opening hole to the back side of the bottom wall and extending toward the side end of the closure jacket,
This is very convenient because the back connection terminal conductor 7 and the front connection terminal conductor 43 can be easily attached and detached from the exposed portion of the main fixed conductor 3. In addition, both the front connection method and the back connection method are available.
The length of each conductor from the contact portion to the terminal portion can be set to the minimum necessary length. In addition, when the surface connection terminal conductor 43 is attached, it is attached so as to be stored in the groove wall 1b along with the back surface of the bottom wall of the mold base 1, so there is no need to worry about insulation between different poles of the surface connection terminal conductor 43. Compared to the conventional method in which the surface connection terminal conductor 43 passes below the arc extinguishing device 30 in the closure envelope and is led out from the side end of the closure envelope, the circuit breakers and disconnectors are made smaller, and the surface connection terminal conductor 43 is The action of pushing back the arc current attracted into the arc extinguishing device by the action of the magnetic flux of the current flowing through the connecting terminal conductor is transmitted to the arc extinguishing device 30 and the surface connecting terminal conductor 43 through the bottom wall of the mold base 1.
The distance between the arc extinguishing device 30 and the arc extinguishing device 30 is increased, the action of pushing back the arc current is reduced, the arc extinguishing performance is improved, and the shear capacity can be increased. Therefore, the strength of the closure jacket is increased, and there are effects such as the closure jacket being prevented from being damaged by the internal pressure of the arc gas generated in the arc extinguishing chamber at the time of crinkling.

[Brief explanation of the drawing]

The drawings show an embodiment of the circuit breaker and disconnector of this invention. Figure 1 is a side sectional view of the circuit breaker equipped with a back connection terminal conductor, and Figure 2 is a side sectional view of the circuit breaker equipped with a front connection terminal conductor. FIG. 3 is a simplified side sectional view of the circuit and disconnector in this case, and FIG. 3 is a perspective view showing the main part of the bottom surface of the mold base. In the figure, 1: mold base, 2: mold cover, 3: main fixed conductor, 4: main fixed contact, 5: arc runner, 6: fixed contact, 8:
Movable contact rod, 9: Main movable contact, 10: Arc movable contact, 11: Flexible conductor, 15: Opening/closing operation mechanism, 16: Operating handle, 18: Opening/closing lever, 1
9, 20: Toggle link, 26: Contact holder, 27: Cross bar, 30: Arc extinguisher, 3
2: Main hook, 33: Secondary hook, 34: Unit case, 35: Trip bar, 36: Locking claw,
38: Current transformer, 39: Electromagnet, 40: Instantaneous trip rod, 41, 42, 44: Mounting screw, 45:
Embedded nut.

Claims (1)

[Scope of utility model registration request] In a closed envelope type circuit or disconnector in which a switching contact device and a switching operation mechanism are housed by a molded base and a molded cover made of a separable insulating material, the molded base is connected to the switching contact portion of the main fixed conductor. An opening hole exposing the flat surface of the back side and a groove wall forming a groove protruding from the vicinity of the opening hole toward the back side of the bottom wall and extending toward the side end of the closure jacket are integrally molded, and the main A back connection terminal conductor is led out to protrude perpendicularly from the exposed part of the fixed conductor to the back side, and a back side connection terminal conductor is housed in a groove along the back side of the bottom wall and led out to the outside of the side end of the closure jacket. A circuit board or a circuit breaker, one of which is selected and detachably fixed to the main fixed conductor exposed in the opening hole of the mold base.