JP2010153148A - Branch breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch breaker capable of improving safety by preventing electric conduction in an incompletely connected state of a load wire. <P>SOLUTION: A power supply connecting part 13 to which power is supplied, a load connecting part 15 to which a load wire is connected, and a circuit breaking part 14 to connect a circuit between the power supply connecting part and the load connecting part so as to be able to break it are housed in a casing 12 to form this branch breaker. This branch breaker includes an operating lever 24 which makes it possible to insert and remove the load wire in and from an wire insertion opening 22 for inserting the load wire connected to the load connecting part 15 when it is in an open state, and fixes the load wire inserted in the wire insertion opening 22 when it is in a closed state, and a lock mechanism 26 which locks a handle 18 to perform opening and closing operation of the circuit breaking part 14 when the load wire is not inserted in the wire insertion opening 22, and releases the lock of the handle 18 when the load wire is normally inserted in the wire insertion opening 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a branch breaker attached to, for example, a single-phase three-wire distribution board.

  For example, as a branch breaker used for a single-phase three-wire distribution board, wire insertion for inserting the load wire into the SL terminal to connect the load wire without screws in order to easily and surely connect the load-side wire Some have a mouth (for example, Patent Document 1).

  In such a branch breaker, by raising the operation lever, the SL terminal inside the housing is deformed into a connectable state, and the load electric wire inserted into the electric wire insertion port can be connected to the SL terminal. Then, by lowering the operation lever, the SL terminal returns to the state before deformation, and the SL terminal is connected to the load electric wire, and a part of the SL terminal is engaged with the load electric wire, thereby preventing the load electric wire from coming off.

  However, since the operation lever can be operated regardless of whether or not the load wire is inserted to the back of the wire insertion port, the operation lever is lowered and used without being inserted to the back. Sometimes.

  In this case, the load wire may be removed from the wire insertion port, or the SL terminal and the load wire may be used in a poor contact state, and an accident such as ignition may occur near the wire insertion port. .

  Therefore, a display lever is provided in the housing in order to notify the user of such insertion failure of the load wire, and when the load wire is inserted deep into the wire insertion port, the display lever protrudes from the housing. There is a thing which shows the insertion state of a load electric wire.

This confirms the insertion state of the load wire by confirming that the display lever protrudes from the housing when the branch breaker is installed, and the load wire is not inserted sufficiently (the load wire connection is still insufficient) Is designed to prevent the use of branch breakers.
JP 2003-31102 A

  However, when the branch breaker is installed, the state of the display lever has not been confirmed, and the circuit breaker may be closed and used when the display lever does not protrude from the housing (under load cable insertion). Accidents such as fire may occur at the connection.

  Further, when used with the operation lever raised, the SL terminal may not be securely engaged with the load wire, and may be disconnected from the wire insertion port during use, resulting in poor contact between the SL terminal and the load wire.

  The objective of this invention is providing the branch breaker which can prevent the electricity supply in the incomplete connection state of a load electric wire, and can improve safety | security.

  The branch breaker according to the invention of claim 1 is capable of interrupting a circuit between the power supply connection portion to which power is supplied, the load connection portion to which a load wire is connected, and the power supply connection portion and the load connection portion. A housing containing a circuit breaker to be connected; a handle provided on the housing for opening and closing the circuit breaker; and a load electric wire provided on the housing and connected to the load connection. A wire insertion port for the operation; an operation lever for fixing the load wire inserted into the wire insertion port in the closed state, enabling insertion and removal of the load wire in the wire insertion port in the open state; A first locking mechanism that locks the handle when a load wire is not inserted into the wire insertion port, and releases the lock of the handle when the load wire is normally inserted into the wire insertion port; It is characterized by having

  In the present invention and the following inventions, definitions of terms and technical meanings are as follows.

  A branch breaker refers to an open / close device provided in an electric wire routed from a main breaker attached to a single-phase three-wire distribution board. A power supply connection part refers to a terminal part connected to, for example, a single-phase three-wire distribution line, and a load connection part refers to a terminal part to which a load electric wire is connected. The circuit interrupting unit refers to an opening / closing unit having a predetermined interrupting capability at the time of overcurrent. The handle is an operation unit that opens and closes the circuit breaker. The handle can be manually opened and closed, and is automatically opened when an overcurrent exceeds a predetermined value.

  The electric wire insertion port refers to an insertion port for inserting a load electric wire into an SL terminal that connects the load electric wire without a screw. The operation lever is an operation part for fixing the load wire inserted in the wire insertion port.When the operation lever is opened, the load wire can be inserted into and removed from the wire insertion port. When in the closed state, fix the load wire inserted in the wire insertion slot.

  The first locking mechanism is a mechanism that locks the handle so that the handle cannot be operated when a load wire is not inserted into the wire insertion slot. This lock mechanism releases the lock of the handle when the load wire is normally inserted into the wire insertion port.

  For example, the first locking mechanism may be provided with a display lever that moves according to the insertion state of the load electric wire in the housing, and locks the handle in conjunction with the operation of the display lever. Any configuration may be used as long as the handle can be locked in a state in which the handle is normally inserted into the wire insertion port.

  A branch breaker according to a second aspect of the present invention is the branch breaker according to the first aspect, wherein the handle is locked when the operating lever is open, and the second lock of the handle is released when the operating lever is closed. A locking mechanism is provided.

  According to the present invention, in addition to the first lock mechanism, a second lock mechanism is provided by opening and closing an operation lever. The lock mechanism by opening and closing the control lever locks the handle when the control lever is open (load cable can be inserted into the cable insertion slot), and locks the handle when the control lever is closed (load cable is fixed). Is released.

  According to the invention of claim 1, the lock mechanism locks the handle for opening and closing the circuit breaker when the load wire is not inserted into the wire insertion port. Can be prevented, and safety can be improved.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the handle is locked when the operation lever is in the open state, and when the operation lever is in the closed state and the load cable is in the fixed state, Since the lock is released, it is possible to more reliably prevent energization when the load wire is incompletely connected.

  FIG. 1 is a configuration diagram of a branch breaker according to an embodiment of the present invention. The casing 12 of the branch breaker 11 is formed of an insulating synthetic resin. A power connection portion 13 to which power is supplied is housed in the rear side portion of the housing 12, a circuit breaker portion 14 is housed in the center portion, and a load wire is connected to the front side portion as the other end portion. The load connection part 15 to be performed is accommodated. The circuit breaker 14 is a part that connects the circuit between the power supply connection 13 and the load connection 15 so as to be able to be cut off. The circuit breaker 14 includes a fixed contact 16 and a movable contact 17. An opening / closing operation for connecting to or releasing from the fixed contact 16 is performed.

  When the handle 18 is operated in the arrow A direction, the pressing body 20 pushes down the movable contact 17 by the link mechanism 19 to contact the fixed contact 16, and the movable contact 17 is connected to the fixed contact 16. In this state, when the handle 18 is operated in the direction opposite to the direction of the arrow A, the movable contact 17 is pushed up by the spring 21 and is separated from the fixed contact 16, and the movable contact 17 is released from the fixed contact 16 to be in a disconnected state. Become.

  The housing 12 on the load connection portion 15 side is provided with a wire insertion port 22 for inserting a load wire, and the load wire is connected to the load connection portion 15 without a screw inside the wire insertion port 22. SL terminal 23 is provided. The SL terminal 23 of the wire insertion port 22 allows the load wire to be inserted / removed when the operation lever 24 is open, and the load wire inserted into the SL terminal 23 of the wire insertion port 22 when the operation lever 24 is open. Fix it.

  The display lever 25 protrudes from the housing 12 when the load electric wire is normally inserted into the electric wire insertion port 22, that is, when the load electric wire is inserted into the SL terminal 23, and the load electric wire is inserted into the electric wire insertion port 22. Is notified to the outside that has been inserted normally. The display lever 25 is provided with a lock mechanism 26. The first lock mechanism 26 provided on the display lever 25 locks the handle 18 when no load wire is inserted into the wire insertion port 22, and when the load wire is normally inserted into the wire insertion port 22. Unlocks the handle 18. As a result, the handle 18 can be operated when the load wire is normally inserted into the wire insertion port 22.

  The SL terminal 23 is provided with a second lock mechanism 27. The second lock mechanism 27 provided in the SL terminal 23 locks the handle 18 when the operation lever 24 is open, and releases the lock of the handle 18 when the operation lever 24 is closed. That is, the handle 18 is locked when the SL terminal 23 of the wire insertion port 22 allows the load wire to be inserted and removed, and the handle is locked when the load wire inserted into the SL terminal 23 of the wire insertion port 22 is fixed. 18 lock is released. Accordingly, the handle 18 can be operated when the load electric wire is inserted and fixed to the SL terminal 23 of the electric wire insertion port 22.

  2A and 2B are explanatory views of the first locking mechanism 26 provided on the display lever 25. FIG. 2A is a plan view when the handle 18 is locked, and FIG. It is a top view when the lock is released.

  As shown in FIG. 2A, the first locking mechanism 26 contacts the locking portion 28 of the handle 18 and locks the handle 18 when the load electric wire is not inserted into the electric wire insertion port 22. . In this state, the display lever 25 does not protrude from the housing 12. On the other hand, as shown in FIG. 2B, when the load electric wire 29 is inserted into the electric wire insertion port 22, the load electric wire 29 presses the rear end portion of the display lever 25. Rotate around 30. As a result, the tip of the display lever 25 protrudes from the housing 12 to notify that the load wire 29 has been normally inserted into the wire insertion port 22. Further, the first lock mechanism 26 is detached from the engaging portion 28 of the handle 18 and unlocks the handle 18.

  As described above, the first lock mechanism 26 provided on the display lever 25 locks the handle 18 when the load wire 28 is not inserted into the wire insertion port 22, so that the load wire 28 is incompletely connected. It is possible to prevent energization in the state and improve safety.

  3A and 3B are explanatory views of the second locking mechanism 27 provided in the SL terminal 23. FIG. 3A is a plan view when the handle 18 is unlocked, and FIG. It is a top view in case the is locked.

  As shown in FIG. 3A, the second lock mechanism 27 unlocks the handle 18 when the operation lever 24 is in the closed state (positioned in the lateral direction). That is, the SL terminal 23 grips the tip end portion of the load electric wire 29 with the grip portion 31 and does not receive the pressing force from the operation lever 24 when the operation lever 24 is positioned in the lateral direction. Is brought into contact with the contact portion 32 to fix the load electric wire 29. In this state, the second lock mechanism 27 is detached from the engaging portion 28 of the handle 18 and the handle 18 is unlocked. Therefore, the handle 18 can be opened and closed.

  On the other hand, as shown in FIG. 3B, the handle 18 is locked when the operation lever 24 is in the open state (when positioned in the vertical direction). That is, the SL terminal 23 grips the tip end portion of the load electric wire 29 with the grip portion 31 and receives the pressing force from the operation lever 24 when the operation lever 24 is positioned in the vertical direction. Is pushed into. As a result, the tip end portion of the load wire 28 gripped by the grip portion 31 of the SL terminal 23 is detached from the contact portion 32 and the load wire 29 is released from being fixed. In this state, the second lock mechanism 27 is engaged from the engaging portion 28 of the handle 18 and the handle 18 is locked. Therefore, the opening / closing operation of the handle 18 is prevented.

  As described above, the handle 18 is locked when the operation lever 24 is open, and the handle 18 is unlocked when the operation lever 24 is closed and the load wire 29 is fixed. It is possible to prevent energization when the electric wire 29 is incompletely connected.

  In the above description, the case where both the lock mechanism 26 provided on the display lever 25 and the second lock mechanism 27 provided on the SL terminal 23 are provided has been described, but either one may be omitted. Good.

The block diagram of the branch breaker concerning embodiment of this invention. Explanatory drawing of the locking mechanism provided in the display lever in embodiment of this invention. Explanatory drawing of the locking mechanism provided in SL terminal in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Branch breaker, 12 ... Housing, 13 ... Power supply connection part, 14 ... Circuit interruption part, 15 ... Load connection part, 16 ... Fixed contact, 17 ... Movable contact, 18 ... Handle, 19 ... Link mechanism, 20 ... Press Body, 21 ... Spring, 22 ... Electric wire insertion port, 23 ... SL terminal, 24 ... Operation lever, 25 ... Display lever, 26 ... First lock mechanism, 27 ... Second lock mechanism, 28 ... Locking portion, 29 ... Load wire, 30 ... Shaft, 31 ... Holding part, 32 ... Abutting part

Claims (2)

A housing that houses a power supply connecting portion to which power is supplied, a load connecting portion to which a load wire is connected, and a circuit blocking portion that connects the circuit between the power supply connecting portion and the load connecting portion so as to be cut off. When;
A handle provided on the housing for opening and closing the circuit breaker;
An electric wire insertion opening for inserting a load electric wire provided in the casing and connected to the load connecting portion;
An operation lever for enabling insertion / removal of the load electric wire into / from the electric wire insertion port when in the open state and fixing the load electric wire inserted into the electric wire insertion port when in the closed state;
A first locking mechanism that locks the handle when a load wire is not inserted into the wire insertion port, and that unlocks the handle when the load wire is normally inserted into the wire insertion port;
A branch breaker characterized by comprising   The branch breaker according to claim 1, further comprising a second lock mechanism that locks the handle when the operation lever is in an open state and releases the lock of the handle when the operation lever is in a closed state.

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