Basic Installation and Operation Guide
JK Series 720 Controllers
TOSHIBA
Isolation Switch
The isolation switch provided in each controller is a bolted pressure type device. It is designed to maintain
proper adjustment and contact pressure over its mechanical life of 10,000 close-open cycles. Under normal
operating conditions, no maintenance is required other than periodic inspection and cleaning.
Wipe off any dust or dirt which may have accumulated on the switch housing, the insulating blade drive links,
and the shutter.
Open and close the switch and verify that no excessive force is required. Observe that the line terminal shutter
opens and closes properly. Lubricate the moving parts of the handle mechanism and, if necessary, apply a light
coat of Toshiba B9 grease to the inside contact surfaces of the switch blades. Contact the equipment supplier
or the factory to obtain B9, grease if required.
Grease is conductive. Do not allow grease to contact the switch housing or the
insulated shutter.
Examine the current-carrying switch blades for any sign of discoloration due to overheating.
Each bolted pressure switch blade assembly is pre-torqued and adjusted to the proper settings at the factory.
DO NOT attempt to change the torque settings or replace any individual parts of this assembly in the field.
If it is necessary to replace the blade assemblies, contact the nearest Toshiba representative.
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