Eaton VacClad-W Instruction Booklet

Also see for VacClad-W: Instructions for installation, operation, maintenance

21Instruction Booklet IB32267ARCEffective December 2010VacClad-W 38 kV arc-resistantswitchgear indoor housingseaton Corporation www.eaton.com8.8 Breaker pan assemblyFigure 28. 38 kV Breaker Pan Assembly—Arc Resistant DesignDescription of Figure 28 callouts1. Ground bus, keeps breaker frame grounded in all positions2. Prevents removal of breaker in any position other than test/disconnect3. Figure shows sliding socket type receptacle for connections ofsecondary control wires between the stationary housing andthe removable breaker element Each circuit breaker is providedwith a matching plug, which automatically engages the abovereceptacle as the breaker is levered into the compartment, butprior to engagement of breaker primary disconnects to cell studsAs the breaker is levered out of the connected position towardthe disconnected position, the plug and socket connections areautomatically broken In the disconnected position, breaker con-trols can be manually engaged for testing by pulling the slidingsocket handle, Item 4, forward (toward the operator), and it canbe disengaged again by manually pushing the handle away fromthe operator Refer to circuit breaker instruction book for furtherdescription4. Sliding socket handle (see Item 4)5. Racking screw and moving block permits breaker insertion andwithdrawal6. Slider used with (7) to prevent levering a closed breaker May beused to padlock a breaker in any position7. Prevents removing a closed breaker8. These are levers used in conjunction with assembly on breakerdoor to mechanically close and trip the breaker with the doorclosed The left-hand lever closes the breaker and the right levertrips the breaker9. The mechanism-operated cell switch (MOC switch) is anassembly of switches that is operated by a lever on the breakermechanism Refer to the shop order drawings for the number ofNO and NC contacts providedThe MOC switch is mounted beneath the cover to the right withthe operating mechanism directly to the left It is activated whenthe breaker is closed Breaker mechanism extends a lever outthe bottom, pushing down on the plunger of the MOC switchoperating mechanism that operates the switch The switchprovides additional NO and NC contact for breaker status(open, close), which can be used for electrical controls,alarm, or interlocking10. The truck operated cell switch (TOC switch) has nine poles Fourcontacts make and five break as the breaker is levered to theconnected position As the breaker is being levered into theconnected position, a bracket on the breaker pushes the TOCswitch lever during the last 1 00-inch (25 4 mm) of the travelcausing the switch to operate The TOC switch is generallyused to electrically indicate whether or not the breaker is inthe connected position, and also for electrical interlocking inthe breaker control circuit11. Code plates Refer to Section 8 5, Safety Features12. Provision for padlocking a breaker in any position This is anoptional feature that allows placement of up to four padlocks13. Picture frame seals primary compartment when breaker isconnected14. Breaker rail guides the breaker in and out of the cell duringlevering in and out15. This is an interlock, which prevents the racking of the breakerwhen the door is open16. This is an interlock, which is used in conjunction with the breakerdoor to prevent opening the breaker door, if the breaker is not inthe disconnect or test position17. Provision for key lock18. Breaker guide rails, which guide the breaker into the cell andensure the breaker alignment with the breaker rail guides (14)12345 6789101112131415 16 1718 8