Method for producing a circuit-breaker pole part

1. A method for producing a circuit-breaker pole part, comprising:

molding an external insulating sleeve with insulation material;

mounting a vacuum interrupter insert inside the insulating sleeve;

electrically connecting the vacuum interrupter insert with an upper electrical terminal and a lower electrical terminal arranged in a wall section of the insulating sleeve;

molding the insulating sleeve, wherein at least only the upper electrical terminal is embedded in the insulation material during molding;

coating the vacuum interrupter insert with an extra layer made of at least one of insulation material at least towards a bottom line open air gap directly between the extra layer and the insulator sleeve, and between the vacuum interrupter insert and the insulator sleeve for better electrical performance; and

mounting the coated vacuum interrupter insert by screwing on a threaded bolt onto the upper electrical terminal before molding or after molding.

2. The method according to claim 1 , comprising:

assembling or molding the lower electrical terminal in the wall of the insulating sleeve; and

electrically connecting the vacuum interrupter insert via a flexible connector band.

3. The method according to claim 1 , comprising:

preassembling the vacuum interrupter to the upper terminal;

disposing the preassembled arrangement into the mould; and

molding the external insulating sleeve together with the lower terminal order to form a complete assembly thereby.

4. The method according to claim 3 , comprising:

placing an insulation cover as a sealing part between the upper terminal and the mold.

5. The method according to claim 3 , comprising:

partly closing the gap with a suitable dielectric insulating after the complete assembly is moulded.

6. A pole part of a circuit-breaker produced by a method according to claim 1 , wherein the insulation material of the insulating sleeve is epoxy material thermal plastic material on the basis of polybutylenterephthalat (PBT) or thermoplastic polyurethane (TPUR).

7. The pole part according to claim 6 , wherein the extra layer on the outer surface of the vacuum interrupter insert is made of an insulation material.

8. The pole part according to claim 7 , wherein the insulation material is one of a shrinkage tube or hotmelts or epoxy or silicon rubber.

9. The pole part according to claim 6 , wherein an additional insulation cup made of an insulating material covers a bottom area of the upper terminal inner side between a front side of the vacuum interrupter insert and the insulating sleeve.

10. A circuit-breaker arrangement for medium-voltage applications comprising:

a magnetic actuator for generation of an operation force, transmitted via a jackshaft arrangement to at least one pole part according to claim 4 .

11. The circuit-breaker arrangement according to claim 9 , wherein for a 3-phase power grid, three pole parts are driven via a common jackshaft arrangement by a magnetic actuator, which could have one or multiple coils.

12. The circuit-breaker arrangement according to claim 10 , wherein the axial of the upper and lower terminal is arranged in with an angle to the axial of the pole between 0 to 180°.

13. The circuit-breaker arrangement according claim 1 , wherein the permanent magnetic actuator is a single coil or double coil magnetic actuator.

14. The circuit-breaker arrangement according to claim 13 , wherein the permanent magnetic actuator is mounted directly under the pole with direction to push rod.

15. The circuit-breaker arrangement according to claim 1 , wherein the pole part is made without extra insulation.