Installation and maintenance instructions UniGear type ZS2 UniSafe-36 1YTW571780-012 Rev:E 01-2005 en Page: 20 of 25
Closing the earthing switch:
Check that the circuit breaker is in test or withdrawn position.
Open the lever entrance(11) by turning 90º the handle(10) anti-clockwise. This will not
be possible if:
-the CB is in service position
-keylocked (7) for Esw at open position.. Do not force.
Insert operating lever.(12+13)
Assure that the circuit to be earthed has no voltage.
Turn the lever (12+13) clockwise 180º to close the earthing switch. This will not
be possible if:
-electrical interlocking of ES position is on. Do not force.
Remove the operating lever, the lever entrance (11) is open.
See the closed (Earthed) position of Esw on indicator from the lower inspection window.
Key-lock if necessary the Esw in closed position (8)
Opening the earthing switch
Check that the circuit breaker is in test or withdrawn position.
The crank entrance (11) is open.
Insert the operating lever (13). This is not possible if the Esw is keylocked(8) at closed position.
Turn the lever anti-clockwise 180º to open the earthing switch. This is not possible if electrical
interlocking coil is on. Do not force.
Withdraw the operating lever.
Close the crank entrance by turning handle(10) 90º clockwise. (Note: The crank entrance must be
closed before the circuit breaker can be racked into service position)
See the open ( 0 ) position indicator from the lower inspection window.
Key-lock if necessary the Esw in open position (7)
Key-lock if necessary the CB against racking into service position (9)
Fig:4.1.4
Fig:4.1.5
Fig:4.1.6
Front view with operating
handle inserted
View from front the position
indicator and auxiliary contacts
View from inside the cubicle,
electro magnetic interlock for
earthing switch
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