| 摘要 |
PURPOSE:To make it possible to operate accurately even for short-circuit current by intervening a coil that is transferred horizontally from the magnetic plug cover to the bottom side of a cylinder by the attraction force of magnetic flux developed between horizontal plates when a large current flows from the outer circumference and the horizontal plates of a yoke. CONSTITUTION:A coil 8 is positioned on the magnetic plug cover 2, and when overload current flows in this state, a plunger 3 is attracted to a magnetic plug cover 2 by the magnetic flux of a coil 8. Accordingly the coil 8 that is opposite to the plunger 3 through the magnetic plug cover 2 gets near to the magnetic plug cover 2, and the magnetic flux of the coil 8 that acts on the yoke 5 increases by the shortening of the air gap, compared with that in the original state (right side) and moves the plunger 3 and coil 5 faster to the magnetic plug cover 2 than before and outputs outside. |
