Instruction Book
Effective: November 2017 Page 54
For more information visit: www.Eaton.com IB131016EN
6-5.1 CONTACT WIPE MEASUREMENT (40KA)
Direct reading contact erosion indicators are not
provided on 31 .5/40kA VCP-T and VCP-TR breakers.
The contact wipe is measured using a dialed caliper
with breaker in the closed position (Figures 6-5 and 6-
6). Acceptable or unacceptable contact erosion is
deter-mined from the contact wipe measurement. The
measurement is 82mm as supplied from the factory. If
a measurement of 87mm or higher is taken, it indicates
that the contacts have eroded to an unacceptable
performance level. The entire vacuum interrupter
assembly must be replaced.
Vacuum interrupters on 31.5/40kA breakers are not
visible from the rear of the circuit breaker without
removing the individual rear covers (Figure 3-9). It is
not necessary to remove the rear covers to make the
wipe measurement. The rear covers are held in place
by the upper and lower primary conductors which must
be removed first to access the vacuum interrupters.
Measurements are taken at the very bottom of each
pole unit as shown in Figure 6-5.
Figure 6-5 Contact Wipe Measurement Being Taken
on Middle Pole of Closed 40kA Breaker
Figure 6-6 Graphical Representation of Exact Contact
Wipe Measurement Location
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