JP5680575B2 - Fuse holder - Google Patents

Description

  The present invention relates to a fuse holder used for mounting a fuse in an electric circuit so that it can be inserted and removed.

  Various electric circuits are provided with fuses for security. For example, in current distribution devices that supply power to a load, fuses are arranged to protect the load and the human body from high voltages, and these fuses are generally attached to a fuse holder provided in an electric circuit. It is mounted so as to be insertable / removable (see, for example, Patent Document 1).

  FIG. 3 shows an example of the configuration of a conventional fuse holder. Here, the fuse 30 is of a cartridge type in which a fusible portion that melts due to overcurrent and cuts off the current is housed in an electrically insulating cartridge, and a pair of blades extending perpendicularly to the bottom surface of the fuse 30 A fuse terminal 31 is provided on the bottom surface of the fuse 30.

  The fuse holder 10 has a substantially rectangular parallelepiped main body 11, and a concave portion that fits the cartridge of the fuse 30 is provided on the upper surface of the fuse holder 10, that is, the upper surface of the main body 11. A pair of holes 13 for receiving a pair of fuse terminals 31 are provided on the bottom surface of the recess, and a fuse holder terminal 14 corresponding to the fuse terminal 31 is provided inside each hole 13. . When the fuse 30 is fitted into the recess and the bottom surface of the fuse 30 comes into contact with the bottom surface of the recess, the lower half of the cartridge of the fuse 30 is accommodated in the recess, and each fuse terminal 31 is inserted into the hole 13 to cope with it. The fuse holder terminal 14 is electrically connected. On the lower surface of the fuse holder 10, a pair of connection terminals 15 provided when the fuse holder 10 is connected to an electric circuit are provided. The pair of connection terminals 15 and the pair of fuse holder terminals 14 are: They are electrically connected by a conductive path 16 provided in the main body 11. A screw hole for attaching the fuse holder 10 to, for example, a current distribution device or a bus bar of a distribution board is also formed at the position of the connection terminal 15.

  In such a fuse holder 10, since the electrical connection between the fuse 30 and the fuse holder 10 is completed only by fitting the fuse 30 in the recess, a portion to which a voltage is applied when the fuse 30 is inserted or removed (charging) Inadvertent contact with the part) is prevented.

JP 2007-200585 A

  In recent years, it has been considered to supply DC power via wiring from a power source to a load device in a customer's house. A fuse is also arranged in a current distribution device that supplies DC power, and the fuse is detachably attached to the fuse holder as described above. When a fuse is pulled out from a live circuit, arc discharge occurs at the moment when the fuse terminal and the fuse holder terminal are separated. In the case of an AC circuit, the moment when the voltage on the circuit becomes zero periodically exists (100 times per second for 50 Hz, 120 times for 60 Hz). It is expected that the arc discharge will stop within the time when is removed. On the other hand, in DC discharge, since there is no moment when the voltage on the circuit becomes zero, arc discharge continues for a long time, and in the case of the fuse holder as described above, the arc can advance to the upper surface side of the fuse holder. There is sex. High-temperature, high-voltage arcs generated by electric discharge can cause circuit damage, electric shock and burns for workers.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fuse holder capable of preventing the occurrence of harmful arc discharge when a fuse is removed even when used in a DC circuit or the like.

  A fuse holder according to the present invention is a fuse holder in which a package-type fuse having a pair of fuse terminals protruding from the bottom surface is detachably mounted, and a pair of connection terminals used for electrical connection with an electric circuit; A pair of holes provided on the mounting surface to which the fuse is mounted and each receiving a pair of fuse terminals, and a pair of holes provided inside the pair of holes, respectively, when the fuse is mounted on the mounting surface A pair of fuse holder terminals that establish electrical connection with the fuse terminals, a conductive path that electrically connects the pair of fuse holder terminals and the connection terminals, and provided on the mounting surface, from the mounting surface of the fuse A first position that at least partially covers the installed fuse, and a fuse covering the fuse so that it can be inserted or removed. A cover member movable between the second position, a contact point provided in the conductive path inside the fuse holder for connecting and disconnecting the conductive path, and a biasing point to the position where the conductive path is connected When the spring member and the cover member are in the second position and are covered with the cover member, the spring member is provided so as to penetrate the mounting surface, and one end is mechanically interlocked with the contact point and is pressed from the outside. An electrically insulative switch rod that disconnects the contact, and is configured such that when the cover member is in the second position, the switch rod is pushed down by the cover member and the contact is disconnected. .

  In the present invention, a movable cover member for preventing the fuse from falling off is provided, a contact for connecting and disconnecting the circuit is provided inside the fuse holder, and the cover member is located at a position where the fuse can be inserted and removed. By configuring the cover member to press the switch rod so that the contact is disconnected, the circuit is reliably disconnected when the fuse is inserted and removed, thereby preventing the occurrence of harmful arc discharge associated with the removal of the fuse. .

It is a schematic cross section which shows the fuse holder of one Embodiment of this invention. It is a perspective view of the fuse holder shown in FIG. It is a schematic cross section which shows the conventional fuse holder.

  Next, a preferred embodiment of the present invention will be described with reference to the drawings.

  The fuse holder according to the embodiment of the present invention shown in FIGS. 1 and 2 is the same as that shown in FIG. 3, but is configured so that the circuit is surely disconnected in advance when the fuse is inserted or removed. This is different from that shown in FIG. Hereinafter, the fuse holder of this embodiment will be described in detail. In the following description, it is assumed that the fuse 30 is of a cartridge type as described above, and a pair of blade-shaped fuse terminals 31 are provided on the bottom surface of the fuse 30.

  The fuse holder 10 has a substantially rectangular parallelepiped main body 11 similar to that shown in FIG. 3, and a recess 12 that fits into the cartridge of the fuse 30 is provided on the upper surface of the main body 11. Are provided with a pair of holes 13 for receiving a pair of fuse terminals 31, respectively, and a fuse holder terminal 14 corresponding to the fuse terminal 31 is provided inside each hole 13.

  On the upper surface of the main body 11, a U-shaped cover member 17 composed of both side wall portions and an upper wall portion is provided. The cover member 17 is a member for preventing the fuse 30 from falling off, and the lower ends of both side walls of the cover member 17 are slidably fitted into two grooves 21 provided in parallel on the upper surface of the main body 11. It is. Such a cover member 17 covers the fuse 30 so as to allow a first position to at least partially cover the attached fuse 30 to prevent the fuse from falling off 30 and insertion and removal of the fuse 30. Is movable between a second position and no second position.

  The pair of fuse holder terminals 14 are electrically connected to a pair of connection terminals 15 provided on the bottom surface of the main body 11 through conductive paths 16 in the main body 11. In the fuse holder 10 of the present embodiment, a contact 18 for interrupting the conductive path 16 is provided in a part of the conductive path 16 inside the main body 11, and the contact 18 is biased by a spring 19. Normally, the conductive path 16 is connected. That is, during normal operation, the contact 18 leads the conductive path 16, the one fuse holder terminal 14, the one fuse terminal 31, the fuse 30, the other fuse terminal 31, the other fuse holder terminal 14, and the conductive path 16. A circuit up to the other connection terminal 15 is formed via the. An electrically insulating switch rod 20 is provided so as to penetrate the upper surface of the main body 11 at a place other than the position where the fuse 30 is attached. The lower end of the switch rod 20 is in contact with the contact 18. The switch rod 20 can be pushed downward from the upper surface side of the main body 11, and when the switch rod 20 is pressed, the contact 18 is separated from the conductive path 16 to cut the conductive path 16. It is like that. The position where the switch rod 20 is provided is a position where the cover member 17 is covered by the cover member 17 when the cover member 17 is in the second position described above. When not pressed, the upper end of the switch rod 20 is located further above the level of the upper wall portion of the cover member 17. As a result, when the cover member 17 is in the second position, the switch rod 20 is pressed by the upper wall portion of the cover member 17 so that the contact 18 is disconnected. Therefore, in order for the conductive path 16 to be in a conductive state by the contact point 18, the cover member 17 must be in the first position that prevents the fuse 30 from falling off. In this state, even if the cover member 17 is slid to the second position, the movement of the cover member 17 is prevented by the switch rod 20 and the cover member 17 is moved to the second position unless the switch rod 20 is intentionally depressed. It cannot be moved to position 2.

  Next, mounting and removal of the fuse 30 in the switch holder 11 will be described.

  When the fuse 30 is attached, first, the switch rod 20 is pressed to bring the contact 18 into a disconnected state, and the cover member 17 is slid to the second position while being pressed. If the cover member 17 is in the second position, the contact 18 is in a cut state, and then the fuse 30 is fitted into the recess 12 and attached. At this time, the bottom surface of the fuse 30 comes into contact with the bottom surface of the recess 12, for example, the lower half of the cartridge of the fuse 30 is accommodated in the recess 12, and each fuse terminal 31 is inserted into the hole 13 and the corresponding fuse holder terminal. 14 is electrically connected. Thereafter, the cover member 17 is slid to a first position that at least partially covers the fuse 30. As a result, the switch rod 20 is moved upward by the urging force of the spring 18, and the contact 18 is in a conductive state, so that the fuse 30 can be energized.

  When removing the fuse 30, first, the switch rod 20 is pressed to bring the contact 18 into a disconnected state, and the cover member 17 is slid to the second position while being pressed. Then, the fuse 30 can be removed by pulling out the fuse 30 from the recess 12. Since the circuit is cut by the contact 18, there is no possibility that harmful arc discharge occurs when the fuse 30 is removed. Note that when the switch rod 20 is pressed to bring the contact 18 into a disconnected state, arc discharge may occur at the contact 18, but the contact 18 is inside the main body 11 of the fuse holder 10 and is isolated from the outside. Therefore, this arc discharge does not cause circuit damage or electric shock / burn of the operator.

  As described above, in the fuse holder 10 of the present embodiment, the insertion and removal of the fuse 30 in the live line state is prevented, and the circuit is turned on / off inside the news holder 10, thereby preventing an accident or damage due to an arc. it can.

DESCRIPTION OF SYMBOLS 10 Fuse holder 11 Main body 12 Recess 13 Hole 14 Fuse holder terminal 15 Connection terminal 16 Conductive path 17 Cover member 18 Contact 19 Spring 20 Switch rod 21 Groove 30 Fuse 31 Fuse terminal

Claims (2)

A fuse holder in which a pair of fuse terminals protruding from the bottom surface is mounted so that a package type fuse can be inserted and removed,
A pair of connection terminals used for electrical connection with an electrical circuit;
A pair of holes provided on a mounting surface to which the fuse is mounted to receive the pair of fuse terminals respectively;
The pair their Re respectively provided inside the bore of a pair of fuse holder terminals for establishing said pair of fuse terminals and electrical connection when mounting the fuse on the mounting surface,
A conductive path for electrically connecting the pair of fuse holder terminals and the pair of connection terminals, respectively .
A first position that is provided on the mounting surface and at least partially covers the fuse in the mounted state so as to prevent the fuse from dropping off from the mounting surface; A cover member movable between a second position that does not cover the fuse,
A contact that is provided in the conductive path inside the fuse holder and connects and disconnects the conductive path;
A spring member for urging the contact at a position where the conductive path is connected;
Wherein a position where the cover member is covered by the upper wall of the cover member when in the second position, presses capable provided in a direction perpendicular to the mounting surface through said mounting surface, the lower end the contact and mechanically contact, and electrically insulating switch rod the contact is disconnected when the upper end is pressed from the outside,
Have
The switch rod is
When the cover member is in the first position, the spring member biases the contact so that the upper end protrudes further above the level of the upper wall portion of the cover member,
Wherein when the cover member is in the second position, the contact is disconnected and sent down push by the upper wall portion of the upper end the cover member, the fuse holder.   2. The fuse holder according to claim 1, wherein a recess for fitting with the fuse is provided on the mounting surface, and the pair of holes are formed on a bottom surface of the recess.

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