GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
prolec.energy/prolecge
26
5.4 Contact Inspection
Total contact life can be determined after this inspection based on the amount of arcing material left in proportion to that which
has been eroded.
Refer to the regulator nameplate for the rating; then determine the contact inspection point from Figure 14.
On the same basis, other VR-1 regulators rated less than 100 kVA and not appearing in Table 7 can operate in excess of 1
contact life must be considered.
The moving contacts and the tips of the stationary contacts are made of an arc-resistant material as shown in Sketch A.,
Figure 14. Note dimensions in Table 6.
Normal contact wear will produce a contact erosion. (See Sketch B., Figure 14.)
The contacts are satisfactory for service until either the stationary or moving contacts are worn to the condition shown in
Sketch C., Figure 14., at which time the entire set of stationary and moving contacts must be replaced.
Switch T L
Low Current 0.188 (4.8) 0.125 (3.2)
Mid Current 0.250 (6.4) 0.156 (4)
High Current & High Voltage 0.250 (6.4) 0.188 (4.8)
Table 6. Arconite Dimensions in Inches (mm) on Stationary Contacts
Reference Number R2033
Figure 14. Contact Wear (See Tables 6 and 7)
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