JPS6187438U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a state in which both armatures are in the suction position in an embodiment of the present invention, FIG. 2 is a side sectional view showing a state in which both armatures of FIG. 1 are in the tripping position, Figure 3 is a plan view of Figure 1 with the front cover removed, Figure 4 is a bottom view with the front cover removed, Figure 5 is a front view with the front cover removed, and Figure 5 is a front view with the front cover removed. Figure 6 is the first
Fig. 7 is a side sectional view showing the state of the slide plate when the front cover in Fig. 2 is removed; Fig. 8 is an exploded perspective view of the main body of the main body shown in Fig. 7; It is a bottom view with this removed. In the figure, 1 is a magnetic frame, 3 is a permanent magnet, 4 is a fixed armature, 5 is a movable armature, 8 is an operating piece, 9 is a tripping spring as a first biasing means, 11 is an excitation coil, and 13 16 is a front cover, 16 is a slide plate, and 18 is a slide spring as a second biasing means.

Claims (1)

[Claims for Utility Model Registration] (1) A movable armature and a fixed armature that contact and separate in correspondence with each other are provided within a magnetic frame formed of a magnetic material, and the state of contact between the two armatures is further provided. a permanent magnet forming a magnetic circuit to attract and hold the movable armature toward the fixed armature; a front cover is removably attached to the front surface of the magnetic frame; A first biasing means that biases the fixed armature in the opening direction engages with the movable armature, and an actuating piece that operates integrally with the movable armature is connected to one end of the movable armature, and both of the armatures When the voltage of the electric circuit reaches a predetermined trip value or less when the two armatures are in contact with each other, a magnetic flux is generated in a direction that cancels out the magnetic flux of the permanent magnet, and both armatures are separated, and both armatures are opened. When the voltage of the electric circuit exceeds a predetermined value when the armatures are separated from each other, a magnetic flux is generated in a direction that increases the magnetic flux of the permanent magnet and brings the two armatures into contact. Such an exciting coil surrounds the movable armature. The movable armature has a portion that protrudes and retracts from the magnetic frame as the movable armature moves, and a constriction is formed in the portion, and when both the armatures are in an open state, The magnetic frame is capable of protruding and retracting movement from the front surface of the magnetic frame toward the front cover to a position that prevents attachment of the front cover in accordance with the constriction, and the protruding and retracting movement is prevented when both the armatures are in contact with each other. be done,
An undervoltage tripping device for a circuit breaker, comprising such a slide plate, wherein the slide plate is biased toward the front cover side by a second biasing means. (2) An actuating piece disposed outside the magnetic frame, which operates integrally with the movable armature when the movable armature is attracted to the fixed armature, and rotates as the actuating piece moves. An undervoltage tripping device for a circuit breaker according to claim 1, comprising a switch lever that is moved and a limit switch that is operated by the rotation of the switch lever.