JPH0110846Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to circuits and disconnectors.

When performing construction work with circuits and disconnectors turned off to change wiring or install wiring equipment, there is a risk that the circuits or disconnectors will be turned on by mistake. For this reason, conventionally,
Closing jigs, etc., and devices to prevent disconnection were prepared. The same applies to earth leakage circuit breakers (for example, Japanese Utility Model Application No. 137770/1983) having a trip test button device that can be tripped by pressing a push button.

Therefore, an object of this invention is to provide a circuit breaker that can very easily prevent the breaker from closing without using a closure jig or the like.

A circuit or disconnector to which an embodiment of this invention is applied is shown in FIGS. 1 to 5. That is, this circuit breaker has an outer shell formed by a base 1 and a cover 2, and the base 1 has a power supply side terminal device 3, a load side terminal device 4, and a movable contact that is biased to open by a return spring 5a. A contact section 7 consisting of a contact element 5 and a fixed contact element 6, a bimetal 8 which detects an overcurrent among the abnormal current detection means, a plunger type electromagnet device 9 which detects a short circuit current among the abnormal current detection means, and a cutting mechanism. A section 10 and an arc extinguishing device 11 are provided. The electric circuit includes a terminal device 3,
4, contact part 7, bimetal 8 and electromagnet device 9
The tripping lever 12 is driven against the return spring 12b by the current detection operation of the bimetal 8 and the electromagnetic device 9.

The mechanism part 10 has a structure in which connecting shafts 17 of a pair of links 15 and 16 are slidably engaged with a long groove 14 of a latch fitting 13, and the first link 15 is connected to a handle 18, and the second link 16 is connected to a handle 18. The latch engaging portion 13 of the latch fitting 13 is connected to the movable contact 5.
a is latched by the tripping lever 12.

Furthermore, a recess 19 is formed in the cover 2, a small hole 20 is formed in the center of the bottom of the recess 19, and a vertical slit 21 is cut in the small hole 20 as shown in FIG. The test button 22 is connected to the head 22 as shown in FIG.
A driver groove 23 is formed in the leg 22b, a split 24 is formed in the tip of the leg 22b to make it bifurcated, a retaining pawl 26 is formed in the forked part 25, and the forked part 2 of the leg 22b is formed with a retaining claw 26.
A protrusion 27 serving as a holding means that fits into the vertical slit 21 is formed on the 5 side. When the return coil spring 28 is passed through the leg 22b, the test button 22 is inserted into the recess 19, and the split 24 is narrowed using the resin elasticity of the fork 25 and pushed into the small hole 20, the return coil spring 28 is compressed. The test button 22 is urged outward from the recess 19 and is prevented from coming out by the retaining claw 26 that has passed through the small hole 20. Then, insert the test button 22 into the recess 1.
9, the protrusion 27 passes through the slit 21 (Fig. 4), and when further rotated, the protrusion 27 passes through the recess 1.
It engages with the outer bottom surface of 9 and is held in the pressed state (FIG. 5).

This circuit breaker is turned on when the latch fitting 13 of the mechanism section 10 is latched to the tripping lever 12 and the handle 18 is tilted to the right as shown in FIG. That is, the first link 15 with the handle 18
By pressing , the connecting shaft 17 is slid into the long groove 14 and the second link 16 is pushed, and the second link 16 presses the movable contact 5 against the fixed contact 6 against the return spring 5a. ). Conversely, if you tilt the handle 18 to the left, links 15 and 16
The movable contactor 5 operates in the opposite manner to the above, and the movable contactor 5 is opened and separated by the return spring 5a.

Next, when it is in the on state and an overcurrent or short-circuit current flows in the electrical circuit, the tripping lever 1 is activated by the time-limited operation of the bimetal 8 or the instantaneous operation of the electromagnetic device 9.
Rotate 2. This rotation of the tripping lever 12 causes the latch engaging portion 13a of the latch fitting 13 to disengage from the lever 12, causing the movable contact 5 to open and separate due to the repulsive force of the return spring 5a. Accompanying this, the connecting shaft 17 slides in the long groove 14, but it engages the constriction 29a of the trip display window 29 of the mechanical frame, thereby placing the handle 18 in a neutral position to display a trip.

Furthermore, if you press the test button 22 in the on state,
The tip of the leg 22b presses the tip 12a of the tripping lever 12 to rotate the lever 12 and release the latch engaging portion 13a of the latch fitting 13. This causes the same tripping operation as described above.

If the test button 22 is further pushed in and rotated to maintain the pushed state, the test button 22 will always be in the state where the release lever 12 is pushed, so even if the handle 18 is turned on, the latch metal fitting 13 will not be latched. Therefore, it is not possible to insert a disconnector.

Note that the push-holding means may include a protrusion in the small hole 20 and a slit in the leg 22b.

As described above, the circuit breaker of the present invention has an abnormal current detecting means and a tripping lever that is biased to return by a return spring and responds to the operation of the abnormal current detecting means, It has a latch metal fitting that is latched to a tripping lever and is released by the operation of the tripping lever, and a handle that is supported by the latch metal fitting in the latched state and operates the movable contact on or off, and a test button for rotating the tripping lever to a state in which the latch metal is released when pushed in, and a test button for rotating the tripping lever to a state in which the latch metal is released by pushing the movable contact in the latch metal fitting. Since the present invention includes a trip test button device having a holding means that maintains the pressed state by rotating the button, the following effects are achieved.

That is, when the trip test button device is pushed in, the test button allows the trip lever to be rotated to the released state, and when returned, the trip lever is in a state in which it can latch the latch fitting. Further, if the holding means holds the test button in the pressed state, the latch metal fitting cannot be latched, so the movable contact will not turn on even if the handle is operated. Therefore, it is possible to easily prevent the disconnector from closing without using a closing jig or the like, and the construction work can be carried out safely even if the handle is accidentally closed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the invention, Fig. 2 is a perspective view of the test button, Fig. 3 is a cross-sectional view of the test button device, and Figs. 4 and 5 are sectional views of the operating state. be. 5...Movable contact, 5a...Return spring, 8...
Bimetal as abnormal current detection means, 9...Plunger type electromagnet device as abnormal current detection means, 1
0...mechanism section, 12...tripping lever, 12b...
...Return spring, 13...Latch fitting, 18...Handle, 22...Test button, 27...Protrusion serving as push-holding means.

Claims (1)

[Scope of utility model registration request] and a tripping lever that is biased to return by a return spring and responds to the operation of the abnormal current detection means, and is latched to the tripping lever in the restored state and released by the operation of the tripping lever. and a handle supported by the latch in the latched state to operate the movable contact on or off, the movable contact in the on state being tripped by the release action of the latch. It has a mechanism part that opens the pole, a test button that rotates the tripping lever to a state where the latch metal fitting is released when pushed in, and a holding means that maintains the pushed state by rotating the test button. Circuit breakers and disconnectors with trip test button devices.