JP2610818B2 - Circuit breaker with timer function - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit breaker with a timer function.

(Background technology)

For time-scheduled operation of equipment that uses late-night power such as night lighting, conventionally, a circuit breaker with a time switch added, a circuit breaker with an electromagnetic contactor and a time switch added in consideration of current capacity, In addition, a remote control circuit breaker provided with an interface circuit constituting a time switch and a sensor interlocking unit was considered.

However, these measures can cause troubles such as a voltage drop due to poor contact due to an increase in the number of contacts, and a failure of the time switch and the contact of the electromagnetic contactor to be reusable in the event of a short circuit on the load side. There is a drawback that the probability of occurrence is high. In addition, there are disadvantages in that installation work and power supply wiring work are complicated, space is increased, and total cost is increased.

[Object of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit breaker with a timer function which can reduce the occurrence of the trouble and can omit a space and wiring.

[Disclosure of the Invention]

The present invention includes a base having a terminal for external connection, a fixed contact provided on the base and connected to the terminal, and a movable contact facing the fixed base, and the movable contact is opened by a spring. An opening / closing mechanism for urging the pole and linking the movable contact and the handle in an operable manner, and breaking and tripping the link in response to an abnormal current such as an overcurrent; and the handle provided on the table base. A bistable electromagnet in which a plunger is coupled to the operation sequence to link with the movable contact and hold the on and off positions of the movable contact at its own stable position, and a timer function provided on the base Unit, the timer function unit has an input unit connected to a power supply connection side of the terminal of the pedestal, has a time setting unit, further in the predetermined time set by the time setting unit Contact The has a time switch circuit for outputting a signal to turn on or off, receives the output signal of the time switch circuit having an output circuit for outputting an exciting current to the bistable electromagnet.

According to the present invention, since the bistable electromagnet is driven by the output of the timer function unit to open and close the movable contact of the circuit breaker, the contact of the conventional time switch provided in the main circuit can be omitted. For this reason, occurrence of troubles is reduced and contact reliability is improved. The timer function unit and the bistable electromagnet 7 are housed in the base 9 together with the opening / closing mechanism unit 5, and the input side of the timer function unit 8 is connected to the power supply side terminal 12, so that the power of the timer function unit 8 is controlled. Since power can be supplied from the electric paths in the bases 9 and 9 ', external terminals and wiring for the timer function section are not required. It is possible to further achieve erroneous connection, disconnection, noise trouble, and the like.

Embodiment An embodiment of the present invention will be described with reference to FIGS. That is, the circuit breaker with a timer function includes a base 9 having terminals 12 and 32 for external connection, a fixed contact 1 provided on the base 9 and connected to the terminal 12, and a movable contact opposed thereto. The movable contact 2 is urged to open by a spring 3 and the movable contact 2 and the handle 4 are operatively linked to each other, and the linkage is broken in response to an abnormal current such as an overcurrent. An opening / closing mechanism 5 that trips,
A bistable electromagnet 7 provided on the base 9 and coupled to the operation sequence of the handle 4 and connected to the movable contact 2 and holding the ON and OFF positions of the movable contact 2 at its own stable position. And a timer function unit 8 provided on the base 9 ′.
12 has an input unit connected thereto and a time setting unit 41
And a time switch circuit 42 for outputting a signal for turning on or off the contact at a predetermined time set by the time setting unit 41. An output circuit 43 that outputs an exciting current to the electromagnet 7 is provided.

The opening / closing mechanism section 5 and the bistable electromagnet 7 are housed in a base 9 constituting an outer shell of the circuit breaker. Table 9
Is formed for each pole, has an opening on the side surface for mounting the above parts, is closed by a side plate 9b, and the timer function part 8 is built in a base 9 ′ having the same shape as the base 9, As shown in Fig. 2
9, 9 'are arranged side by side. Note that an upper cover 9a is attached to the upper surface so as to straddle the bases 9, 9 '.

The fixed contact 1 is provided on the bottom of the base 9. The fixed contact 1 is provided with a fixed contact 10, and is connected to a power supply terminal 12 via a flexible wire 11.

The movable contact 2 has a movable contact 13 at its distal end which comes into contact with and separates from the fixed contact 10, and is supported at its proximal end by a first movable shaft 14 on a movable contact support frame 15. Is interposed.

The handle 4 is supported on the table 9 by a fixed shaft 17,
One end of the link 19 is connected by the second movable shaft 18 and the link
The other end of 19 is connected to the first movable shaft 14.

The means for tripping when the linkage is broken in response to an abnormal current such as an overcurrent of the opening / closing mechanism 5 is mainly as shown in FIG.
Bimetal 20 for overcurrent detection and electromagnet device for short circuit detection
An abnormal current detecting means 22 consisting of 21; a tripping member 23 responsive to the abnormal current detecting means 22;
Latch link 24 latched by
And a spring 3 for urging the movable contact 2 to open. The trip member 23 and the latch link 24
Are supported by fixed shafts 25 and 26, respectively, and a fixed member 25 is provided with a trip member return spring 27.
Is provided. The other side of the latch link 24 opposite to the side latched by the latch portion 28 is connected to the movable contact support frame 15 by a third movable shaft 29. As shown in FIG. 5, the electromagnet device 21 for short-circuit current detection is
Is provided so that the movable contact 2 can be locked. The load side terminal 32 is provided on the opposite side of the power supply side terminal 12 of the base 9 and the coil 33 (the fifth
(See Fig.), The flexible wire 34, the overcurrent detecting bimetal 20, the frame 35, and the flexible wire 36 are connected to the movable contact 2.

The bistable electromagnet 7 is a polarized type having a pair of permanent magnets 37 mainly as shown in FIG. 4. The plunger 6 has a lower end contacting a large yoke 38 and an upper end contacting a small yoke 39, respectively. 5 and a second stable state in which the upper end of the plunger 6 contacts the large yoke 38 and the lower end contacts the small yoke 39 in FIG. The coil 40 is the plunger 6
When the pulse current is supplied, the plunger 6 is driven to the other stable state by its polarity. The plunger 6 is connected to the handle 4 via a connecting link 6a as shown in FIG.

As shown in FIG. 1, the timer function unit 8 mainly includes a time setting display unit 41 and a time switch circuit 42 having an input unit.
And an output circuit 43. The time setting display section 41 has a time setting button 44 for setting the current time and the like, a time display section 45, and two types of time (for example, the first midnight power (23:00 to 7:00)
And a switching lever 46 for setting a second midnight electric power (1:00 to 6:00). These are provided from the upper cover 9a of the base 9 as shown in FIG. It is provided so as to be exposed. As shown in FIG. 1, the time switch circuit 42 has an input section connected to the power supply terminal 12, operates at a set time based on the switching lever 46, outputs a signal, and operates the output circuit 43. ing. Further, the output circuit 43 is configured so as to output a pulse as an exciting current, and its output terminal is connected to the coil 40 of the bistable electromagnet 7. The power of the timer function unit 8 is received from the electric circuit on the power supply terminal 12 side inside the circuit breaker. Therefore, at the set time, the pulse of the output circuit 43 drives the bistable electromagnet 7. Since a more specific circuit configuration of the timer function unit 8 is known, it is omitted.

47 (FIG. 1) is a normally-closed trip interlocking contact connected in series to the coil 40 of the bistable electromagnet 7, and is constituted by a microswitch 48 (FIG. 4). This micro switch 48 is latched via an interlocking lever 49.
The micro switch 48 is driven in conjunction with the trip operation of the latch link 24 by engaging with the protrusion 50 on the side of the 24.

51 (FIG. 3) is a trip test button for tripping the tripping member 23, 52 is an arc extinguishing device, 53 is a trip display mechanism,
54 (FIG. 2) is a lock nut for mounting a concealing cover (not shown) for concealing the time setting button 44 and the like of the upper cover 9a.

56 is a connecting hole for the base 9, 9 ', 57 is a mounting groove for the base 9, 9',
58 is a trip interlocking member that trips the tripping member 23 of the other pole in response to the latch link 24, and 59 is a handle interlocking rod that interlocks the handle (not shown) of the other pole.

The operation of the circuit breaker with a timer function will be described. That is, FIG. 3 shows the ON state and the movable contact 13
Contacts the fixed contact 10 and, as described above, the bistable electromagnet 7
Is held by A contact pressure is applied by a contact pressure spring 16.

FIG. 5 shows the off state, and when the handle 4 is turned from the state shown in FIG. 3 to the state shown in FIG. 5, the plunger 6 of the bistable electromagnet 7 moves upward to be in a stable state. At the same time, the movable contact 2 rotates about the third movable shaft 29 to
13 is separated from the fixed contact 10.

Here, operations of the timer function unit 8 and the bistable electromagnet 7 will be described. An exciting current by a pulse is supplied from the output circuit 43 to the coil 40 of the bistable electromagnet 7 at a predetermined time by the timer function unit 8. The excitation of the coil 40 causes the plunger 6 to move to the opposite side to move the handle 4 from the on side to the off side or vice versa. As a result, the circuit breaker with the timer function automatically operates from on to off or vice versa at a predetermined time.

FIG. 6 shows a trip state caused by a short-circuit current from the ON state. When a short-circuit current flows through the coil 33 of the short-circuit detecting electromagnet device 21, the movable core 30 is attracted to the fixed iron core 55 against the return spring 54. The movable bar 56 operates in conjunction with the movable iron core 30 to push and rotate the tripping member 23, and the latch link 24 is released from the latch portion 28. Latch link 24
Is rotated by the spring 3 and the third movable shaft 29 is moved, so that the movable contact 2 is rotated about the first movable shaft 14 and the movable contact 13 is separated from the fixed contact 10. Since the forcibly opening rod 31 pulls the movable contact 2 so as to compress the contact pressure spring 16 momentarily faster than this operation, the movable contact 13 separates from the fixed contact 10 more quickly to realize high-speed current limiting.

On the other hand, when an overcurrent flows, the tripping member 23 is rotated by operating the overcurrent detecting bimetal 20, so that the same trip operation as described above is performed except for the operation by the forced opening rod 31.

The reset after the trip is performed by moving the handle 4 to the off position in a state where the tripping member 23 is returned by the return spring 27, thereby pulling up the movable contact 2 via the link 19 and returning the latch link 24, and Latch to 28.

Due to the operation of the latch link 24 accompanying this trip operation, the projection 50 in FIG.
, The lever 48a of the micro switch 48 returns from the on state to the off state, and the trip interlocking contact 47 is opened. As a result, the circuit of the coil 40 is opened, and the bistable electromagnet 7 is not driven by the timer function unit 8. That is, there is no automatic reset and re-input.

With this configuration, the circuit breaker with a timer function can omit the contacts of the time switch provided in the main circuit as compared with the conventional circuit breaker. Is improved. Therefore, space saving, contact saving material, and wiring saving are achieved. Further, the timer function unit 8 and the bistable electromagnet 7 are housed in the table 9 together with the opening / closing mechanism unit 5, and the input side of the timer function unit 8 is connected to the power supply terminal 12 side. Can be taken from the electric paths in the bases 9, 9 ', so that external terminals and external wiring for the timer function unit 8 are not required, so that further space and wiring savings can be achieved, and further rear connection, disconnection, and Noise trouble can be prevented.

In addition, since the bistable electromagnet 7 has polarity and is driven in two directions by pulses of different polarities, the coil 40 requires only one winding, and can be reduced in size and consume less power.
In addition, the trip interlocking contact 47 does not automatically reset or turn on again the bistable electromagnet 7 in an accident state such as a short circuit.

FIG. 7 shows another embodiment of the opening / closing mechanism 5, in which the abnormal current detecting means 22 of the above embodiment is located on the opposite side of the handle 4 and the bistable electromagnet 7 via the movable contact 2. Are provided on the same side as the handle 4 and the bistable electromagnet 7. That is, the movable contact 2 and the plunger 6 of the bistable electromagnet 7 are connected by the latch link / connection link 55, and the latch link / connection link 55
, The latch link / connection link 55 is rotatable in a direction perpendicular to the operation direction of the plunger 6, and the latch link / connection link 55 is latched by the tripping member 23, and the tripping is performed. Member 23 is an abnormal current detecting means
It is configured to trip at 22 (in this case, bimetal). Other members having the same functions as those in FIG. 3 are denoted by the same reference numerals.

The present invention is not limited to the configuration of the opening / closing mechanism unit 5 in each of the above embodiments. Further, the bistable electromagnet 7 may be configured to be driven by a timer function unit 8 and to be remotely controlled by an operation signal from a remote place. In the above embodiment, the nut 54 for the concealment cover may not be provided.

〔The invention's effect〕

According to the present invention, since the bistable electromagnet is driven by the output of the timer function unit to open and close the movable contact of the circuit breaker, the contact of the conventional time switch provided in the main circuit can be omitted. For this reason, occurrence of troubles is reduced and contact reliability is improved. In addition, the timer function unit and the bistable electromagnet are housed together with the opening / closing mechanism unit in the table, and the input side of the timer function unit is connected to the power supply terminal side, so that power can be supplied from the electric circuit in the table. For,
External terminals and connection for the timer function section are not required, so that simplification due to the elimination of the above-mentioned contact points, space saving, installation work and wiring saving are achieved, and erroneous connection, disconnection and noise trouble can be prevented. This has the effect.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of an embodiment of the present invention, and FIG.
FIG. 3 is a plan view of a circuit breaker with a timer function unit function, FIG. 3 is a cross-sectional view in an ON state, FIG. 4 is a cross-sectional view in a different cross-sectional position, FIG. FIG. 7 is a sectional view of a trip state, and FIG. 7 is a sectional view of another embodiment in an on state. 1 fixed contact, 2 movable contact, 3 spring, 4
... handle, 5 ... opening and closing mechanism, 6 ... plunger,
7 ... Bistable electromagnet, 8 ... Timer function section, 9,9 '...
... Base, 12 ... Power supply side terminal, 32 ... Load side terminal, 41 ...
Time setting display section, 42: Time switch circuit, 43: Output circuit

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-101737 (JP, A) JP-A-57-72707 (JP, U) JP-A-59-85004 (JP, U) JP-B-45 1692 (JP, B1)

Claims (2)

(57) [Claims] 1. A base having a terminal for external connection, a fixed contact provided on the base and connected to the terminal, and a movable contact facing the fixed base. An opening / closing mechanism unit that urges the opening and operatively links the movable contact and the handle and that breaks and trips in response to an abnormal current such as an overcurrent, and provided on the base; A bistable electromagnet having a plunger coupled to the operation sequence of the handle and linked to the movable contact and holding the on and off positions of the movable contact at its own stable position, and a timer provided on the base A function unit, the timer function unit having an input unit connected to a power connection side of the terminal of the pedestal,
A time switch circuit for outputting a signal for turning on or off a contact at a predetermined time set by the time setting unit; A circuit breaker with a timer function that has an output circuit that outputs an exciting current to a stable electromagnet. 2. A base having a terminal for external connection, a fixed contact provided on the base and connected to the terminal, and a movable contact facing the fixed base. An opening / closing mechanism unit that urges the opening and operatively links the movable contact and the handle and that breaks and trips in response to an abnormal current such as an overcurrent, and provided on the base; A bistable electromagnet having a plunger coupled to the operation sequence of the handle and linked to the movable contact and holding the on and off positions of the movable contact at its own stable position, and a timer provided on the base The timer function unit has an input unit connected to a power connection side of the terminal of the pedestal, has a time setting unit, and further has a predetermined time set by the time setting unit. Contact A time switch circuit for outputting a signal for turning on or off a point, and an output circuit for receiving an output signal of the timer switch circuit and outputting an exciting current to the bistable electromagnet; The electromagnet operates in different directions when pulse currents having different polarities are supplied to the coil, and the coil has a series of trip interlocking contacts that open in conjunction with the trip operation of the opening and closing mechanism. Connected circuit breaker with timer function.