8
Figure 15.
Type VR contact structure.
Figure 16.
Type VCR contact structure.
NOTE: The contact structure for Type VCR
switches below serial 1770 uses wedge-
shaped contacts for load-carrying as well as
arcing. It is strongly recommended that these
old-style contact assemblies be replaced
with the updated version. A contact assembly
kit, KA704VCR is available for this purpose.
Three kits are required per switch. Instruc-
tions for replacing the contact structure are
included in the kit.
The Type VLR switch utilizes a set of
bayonet-type moving contacts which
operate within self-blast interrupter
chambers (Figure 4). Separate service
and alignment procedures are included
for the Type VLR switch.
Contact service and alignment will be
greatly simplified if the head assembly
is inverted; bushings down. The head
assembly can be supported on its bush-
ings.
TYPE VR AND VCR SWITCHES
If it has been determined that the con-
tacts must be replaced, refer to Figures
15 or 16, as appropriate, and proceed
as follows.
1. Remove and discard the moving con-
tact assembly by removing the two
screws and stop nuts that attach the
assembly to the contact rod.
2. Remove the stationar y contact
assembly.
A. Type VR switch (Figure 15)
(1) Remove the hardware that
attaches the stationary con-
tact assembly block to the
contact support housing and
discard the entire contact
assembly.
Type VCR switch (Figure 16)
(1) Disconnect the resistor from
the bracket attached to the
arcing contact assembly.
(2) Remove the attaching hard-
ware that secures the entire
stationary contact assembly
to the contact housing.
(3) Remove the spacer, the arc-
ing contact assembly and
the insulator.
(4) Complete the disassembly by
removing the stud, lock-
washer, and load-carrying
contact assemblies.
(5) Discard the arcing and load-
carrying contact assemblies.
