Electromagnetic contactor

An electromagnetic contactor which opens and closes a fixed contact by means of a movable contact provided in a movable insulation stand to be reciprocating in accordance with excitation and de-magnetization of an electromagnetic device, wherein said electromagnetic device, comprising:

• a first yoke member having a generally ]-shaped configuration with a hole at one side;
• a second yoke member of a plate-like configuration provided with a guide opening corresponding to the hole of the first yoke member;
• at least a pair of third yoke members installed within a space surrounded by the first and second yoke members;
• at least a pair of permanent magnets each inserted between the first yoke member and the third yoke member with placing the same polarity opposite to that of the other;
• a cylindrical coil with an opening provided between the pair of third yoke members;
• an iron core inserted slidably through the opening of the coil member of the first members, the iron piece to the core being moved slidingly along the coil member when the coil member is excited;
• and
• a pair of iron pieces fixed at both ends of the iron core and positioned against the pair of third yoke members, and embracing member being the iron piece to the movable insulation stand provided with the movable contact thereon, and wherein the fixed contact being provided at a stationary position facing the movable contact.

An electromagnetic contactor which opens and closes a fixed contact by means of a movable contact provided in a movable insulation stand to be reciprocating in accordance with excitation and de-magnetization of an electromagnetic device, wherein said electromagnetic device, comprising:

• a first yoke member having a generally ]-shaped configuration with a hole at one side;
• a second yoke member of a plate-like configuration provided with a guide opening corresponding to the first yoke member;
• at least a pair of third yoke members installed within a space surrounded by the first and second yoke members;
• at least a pair of permanent magnets each inserted between the first yoke member and the third yoke member with placing the same polarity opposite to that of the other;
• a cylindrical coil with an opening provided between the pair of third yoke members;
• an iron core inserted slidably through the opening of the coil member, the iron core being moved slidingly along the coil member when the coil member is excited, wherein a pair of iron pieces fixed at both ends of the iron core and positioned against the pair of third yoke members, and wherein the movable insulation stand is connected to the iron piece by an embracing member to allow the first yoke member to be accommodated between the iron piece and the movable insulation stand.