Electromagnetic switching device

1. An electromagnetic switching device, comprising:

a case defining an outer appearance of the electromagnetic switching device;

a fixed contact point assembly detachably inserted into the case and including a fixed contact point;

a coil terminal assembly detachably coupled to one side of the fixed contact point assembly and including a coil assembly and a frame, the coil assembly including a coil and an internal yoke that are received in the frame; and

a shaft assembly detachably inserted into the coil terminal assembly, wherein the shaft assembly includes:

a shaft formed with an opening and movable in the coil terminal assembly;

a movable core connected to a lower side of the shaft;

an elastic member received in the shaft; and

a movable contact point assembly connected to the shaft, wherein the movable contact point assembly includes:

a movable contact point selectively contacting the fixed contact point; and

a contact point support part inserted into the opening and fixed to one side of the shaft, the contact point support part supporting the movable contact point,

wherein the internal yoke includes a first internal yoke spaced apart from a second internal yoke,

wherein the first internal yoke is inserted into the frame from an upper portion of the frame and the second internal yoke is inserted into the frame from a lower portion of the frame,

wherein the frame includes a protrusion formed at an interface between the first and second internal yokes and configured to fix positions of the first and second internal yokes, and

wherein the fixed contact point assembly further includes a groove and the coil terminal assembly further includes a protrusion that is detachably coupled to the groove and the shaft assembly is detachably coupled to the coil terminal assembly such that each of the contact point assembly, the coil terminal assembly and the shaft assembly are separately detachable.

2. The electromagnetic switching device of claim 1 , wherein

the shaft is inserted into the first and second internal yokes.

3. The electromagnetic switching device of claim 1 , wherein one surface of the protrusion protrudes a predetermined distance toward the internal yoke.

4. The electromagnetic switching device of claim 2 , wherein the coil terminal assembly further includes:

an external yoke surrounding a portion of an outer surface of the frame; and

a housing coupled to the external yoke.

5. The electromagnetic switching device of claim 4 , wherein:

the external yoke and the housing each have holes; and

the shaft passes through the holes.

6. The electromagnetic switching device of claim 1 , wherein the coil terminal assembly further includes a housing on which that coupling protrusion is formed.

7. The electromagnetic switching device of claim 6 , wherein the fixed contact point assembly further includes:

a fixed panel provided with the fixed contact point, the fixed panel formed at one side of the fixed contact point assembly.