Isolation Switch - Toshiba JK 400 Series Instruction Manual

Basic Installation and Operation Guide

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 (Fig. 47), 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
WARNING
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.
TOSHIBA
JK 400 Series Fixed Controllers
Fig. 47 Checking Isolation Switch
31