8 User's manual UBB | 1ZSE 5492-156 en, Rev. 4
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Layout of on-load tap-changer, type UBB.
1. Bevel gear
2. Lifting eye
3. Flange
4. Cylinder
5. Change-over selector moving contacts
6. Change-over selector fixed contacts
7. Selector switch fixed contacts
8. Selector switch moving contacts
9. Selector switch shaft
10. Bottom drain screw
11. Bottom
12. Valve R½” for filling and draining of oil
13. Top cover
14. Connection to conservator
15. Pressure relay
16. Air release valve to transformer tank
17. Air release valve for tap-changer
18. Position indicator window
19. Current collector terminal
20. Transition resistor
21. Shielding rings
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