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Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
Chapter 5 Maintenance
Figure 48 - Isolation Switch Defeater
3. Phase 3 (far right linkage) must be measured for overall travel.
All three phases share the same main actuating shaft but the Phase 3 is
the easiest to measure.
Figure 49 - Isolation Switch Linkage Assembly Location
4. Rest the customer-supplied digital protractor on the bottom of the
isolation switch linkage assembly.
The angle of the linkage must be 180º or slightly higher, with a tolerance
of 0/+6º.
Closed position
Open position
Isolation Switch
Operating
Handle
Isolation
Switch
Defeater
Isolation Switch Linkage
Assembly (Phase 3)
If a digital protractor is unavailable, lay a straight edge
against the bottom of the steel lever on the operating
shaft to check for parallel alignment of the red link.