Patent ID: 8461950

Claim:
An electromagnetic switching device, comprising: a housing; a plurality of fixed contacts disposed in the housing; a movable contact disposed in the housing and configured to contact the plurality of fixed contacts and to separate from the plurality of fixed contacts; and a driving unit disposed in the housing at one side of the housing and configured to drive the movable contact, the driving unit comprising: a coil configured to generate a magnetic force; a fixed core disposed at an inner side of the coil; a movable core configured to move toward the fixed core and to move away from the fixed core; an operation rod having one end connected to the movable core and another end connected to the movable contact; and a spring positioned between the movable core and the fixed core and configured to bias the movable core away from the fixed core and to bias the movable contact into contact with the plurality of fixed contacts when power supply to the coil is removed; and a contact spring disposed opposed to the plurality of fixed contacts with the movable contact interposed between the contact spring and the plurality of fixed contacts, and interposed between the movable contact and a plate coupled to the end portion of the operation rod connected to the movable contact, wherein the plate coupled to the end portion of the operation rod connected to the movable contact is configure to move with the operation rod, wherein the contact spring is configured to further bias the movable contact into contact with the plurality of fixed contacts, wherein the plurality of fixed contacts are disposed perpendicular to a moving direction of the movable contact, wherein one contact of the plurality of fixed contacts is configured to connect to a power source, wherein another contact of the plurality of fixed contacts is configured to connect to a load, and wherein a distance between the movable contact and the driving unit is greater than a distance between the fixed contacts and the driving unit.