JPH07141979A - Earth leakage breaker - Google Patents

Abstract

PURPOSE:To provide an earth leakage breaker having a dial type sensitivity changeover switch and time limit changeover switch, wherein the breaker can work well with a high speed operation mode as well as retardant operation mode using the same specifications by equipping an interlock lever, etc. CONSTITUTION:When a time limit changeover knob 12 is set to a high speed mode, an interlock lever 17 is held in the retreat position by a spring 19, so that a sensitivity/current changeover knob 9 can be switched freely between the high sensitivity (30mA) and low sensitivity (100mA, 200mA). Even if a trial to change over the knob 12 to the retardant mode while the setting is in high sensitivity, the rotation of the lever 17 by a lever actuating arm 16 is locked by a time limit changeover stopper 15 so that the knob 12 will never be switched to the retardant mode. In case the knob 12 is being set to the retardant mode, the lever 17 is rotated by the arm 16 against the action of the spring 19, and a sensitivity/current changeover stopper 14 is locked by a lock claw 17a so that the knob 9 is locked in the position of low sensitivity. Accordingly the rotation can be conducted only in the direction of low sensitivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker having a sensitivity current changeover switch and a time delay changeover switch.

[0002]

2. Description of the Related Art FIG. 5 is an external view showing a conventional earth leakage breaker disclosed in, for example, Japanese Utility Model Laid-Open No. 62-82546, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 6 is an exploded perspective view of FIG. In the figure, 1 is a circuit breaker housing composed of a base 1a and a cover 1b, 2 is an operation handle, 3 is a leakage display button, 4 is a test button, 5 is a substrate, and 6 is a dial capable of switching from high sensitivity to low sensitivity. Type sensitivity current changeover switch, 7 a dial type time changeover switch capable of switching between high speed and time delay, 8 a reinforcing holding plate, 9 a sensitivity current changeover knob for rotating the sensitivity current changeover switch 6, and a cover 1b.
It is fitted in the hole 10 and can be rotated by a driver 11 from the outside. Reference numeral 12 is a time-shifting knob for rotating the time-shifting switch 7, which is a hole 13 in the cover 1b.
It is fitted into the and can be rotated by a driver 11 from the outside.

[0003]

As described above, the conventional earth leakage breaker has the sensitivity current switching knob 9 and the timed switching knob 12 as described above.
Since and can be rotated independently, it is necessary to make a high-speed type specification and a time delay type specification separately. It was necessary to use properly.

That is, in the case of the high-speed type, when the high sensitivity is set, the time limit switching knob 12 can be rotated to the time delay side as in the conventional one, and in the time delay type specification, the sensitivity current switching knob 9 is used. However, if it can rotate to the high sensitivity side like the above-mentioned conventional one, it is unacceptable from the viewpoint of protecting the human body. Therefore, for the high-speed type specification, the timed switching knob 12 is not rotated to the time delay side. In the extended type, the sensitivity current switching knob 9 is not rotated to the high sensitivity side and is separately provided.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an earth leakage circuit breaker which is of one specification and can be applied to both high speed type and time delay type.

[0006]

SUMMARY OF THE INVENTION An earth leakage breaker according to the present invention has a sensitivity current changeover knob for rotating a sensitivity current changeover switch, a time limit changeover knob for rotating a time limit changeover switch, and a time delay operation position. It is provided with an interlock lever that locks so that it cannot be set to high sensitivity.

Further, a lever operating arm is provided on the time limit switching knob, and a time limit switching stopper is provided on the sensitivity current switching knob.

[0008]

According to the present invention, when the time limit switching knob is set to high speed, the sensitivity current switching knob can be freely switched between high sensitivity and low sensitivity, but the time switching knob is set to the time delay side by the interlock lever. It is locked so that it cannot be switched, and when the timed switching knob is set to delay, the sensitivity current switching knob is locked by the interlock lever so that it cannot be switched to the high sensitivity side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of essential parts, FIG. 2 is a connection diagram when the time limit switching knob is set to a high speed, FIG. 3 is a connection diagram showing a state in which the time period switching knob is locked at a high speed side, and FIG. It is a connection diagram when it is set to the time delay side, and the same or corresponding parts as those of the above-mentioned conventional one are denoted by the same reference numerals and the description thereof will be omitted.

In the figure, 14 is a sensitivity current switching knob 9
To the sensitivity current switching knob 9, 15 is a time-sensitive switching stopper projected to the sensitivity current switching knob 9, 16 is a lever operating arm projected to the time-sensitive switching knob 12, 1
An interlock lever 7 is rotatably mounted on the reinforcing holding plate 8 by a shaft pin 18 and has a lock claw 17a. 19 is a spring for urging the interlock lever 17 to the unlocked position, and 20 is the interlock lever 17
It is a holding pin that supports the rotation of the.

Now, a case where this product is used in a high-speed type will be described. When the timed switching knob 12 is set to a high speed as shown in FIG. 2, the interlock lever 17 is biased and held at the retracted position by the spring 19, so that the sensitivity current switching knob 9 has the high sensitivity (30 mA) shown in FIG. ) Position to rotate in the direction of arrow 21 and low sensitivity (100mA → 200m
You can freely switch to A) and vice versa. This time,
In the high sensitivity setting state of FIG. 2, the time limit switching knob 12
3 is switched to the time delay side, the lever operating arm 16 which rotates in the direction of arrow 22 in FIG. 3 is locked by the time switching stopper 15 even if the interlock lever 17 is rotated against the spring 19. The time limit switching knob 12 cannot be switched to the time delay side. In this way, a high speed type product is obtained.

Next, the case where the product is used in the time delay type will be described. As shown in FIG. 4, when the time switch knob 12 is set to the time delay 1 (the same applies to the time delay 2), the lever operating arm 16 rotates the interlock lever 17 against the spring 19 to the position shown in FIG. Therefore, the sensitivity current switching stopper 14 is locked by the lock claw 17a as shown in FIG. 4, and the sensitivity current switching knob 9 is locked at the low sensitivity (100 mA) position. Therefore, the sensitivity current switching knob 9
Can rotate in the direction indicated by arrow 23, that is, in the direction of low sensitivity (200 mA) without rotating in the direction of high sensitivity (30 mA). In this way, it becomes a time delay type specification product.

[0013]

As described above, according to the present invention, it is possible to obtain the effect that one specification is applicable to both the high speed type and the time delay type.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention.

FIG. 2 is a connection diagram when the time limit switching knob is set to high speed.

FIG. 3 is a connection diagram showing a state in which the time limit switching knob is locked on the high speed side.

FIG. 4 is a connection diagram when the time limit switching knob is set to the time delay side.

FIG. 5 is an external view showing a conventional one.

6 is a cross-sectional view of the main part taken along the line VI-VI of FIG.

FIG. 7 is an exploded perspective view of FIG.

[Explanation of symbols]

 1b Cover 5 Substrate 6 Sensitivity Current Changeover Switch 7 Time Limit Changeover Switch 8 Reinforcement Holding Plate 9 Sensitivity Current Changeover Knob 12 Timeline Changeover Knob 14 Sensitivity Current Changeover Stopper 15 Timed Changeover Stopper 16 Lever Actuating Arm 17 Interlock Lever 19 Spring

Claims (2)

[Claims] 1. An earth leakage circuit breaker having a dial type sensitivity current changeover switch capable of switching from high sensitivity to low sensitivity and a dial type time limit changeover switch capable of switching between high speed operation and time delay operation. A sensitivity current switching knob for rotating the switch, a time-limiting switching knob for rotating the time-limit switching switch, and an interlock lever for locking the time-delay operation position so that high sensitivity cannot be set. Earth leakage circuit breaker. 2. The interlock lever is retracted to a position where it does not interfere with the sensitivity current switching knob when the time switching switch is set to the high speed operation position and the time switching switch is set to the high speed operation position. The lever operation arm that moves the interlock lever to a position that prevents the sensitivity current switching knob from being set to the high sensitivity position, and the interlock when the sensitivity current switching knob is set to the high sensitivity position. 2. The earth leakage circuit breaker according to claim 1, further comprising a time limit switching stopper which engages with the lock lever to prevent the time period switching knob from being set to a high speed operation position.