To shorten the initial magnetic gap between the magnetic pole of a fixed core and a movable core without reducing the trip stroke of the movable core, and to ensure a high attraction of the movable core to the fixed core.
On the magnetic pole 31f side of a fixed core 31 in a movable core 37, a magnetic auxiliary core 41 provided to face the magnetic pole 31f of the fixed core 31 and configuring the movable core part 51 together with the movable core 37 is provided. The magnetic attraction generated between the magnetic pole 31f and the attracted part 37a of the movable core 37, is combined with the magnetic attraction between the fixed core 31 and the auxiliary core 41 to generate the operation of attracting the movable core part 51 to the fixed core 31 thus interrupting the circuit breaker automatically.
JPH0697590 | [Title of the Invention] Breaker |
KOMOTO SHIGEKI
SHINODA HIDEO
SATO HITOSHI
JPH1125840A | 1999-01-29 |
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami