30- Akd 8, Primary Disconnects (Contacts) Or "Fingers - ABB AKR30S-800A Installation And Maintenance Manual

30- AKD 8, Primary Disconnects (Contacts) or "Fingers"
Finger Clusters Accessory Manual 2TSA451015PO000 covers the primary disconnects or
fingers.
The primary disconnects are flexible connections between the breaker line and load
terminals and between the equipment line and load terminals. All primary disconnect fingers
are factory-installed and are assembled on Emax 2 Retrofill circuit breakers. Use this
instruction sheet if damaged fingers need to be replaced. It takes about 5 minutes to install
a finger cluster, defined as a double pair of fingers on a breaker.
Figure 53 shows finger clusters or primary disconnects on a Retrofill circuit breaker.
Figure 54 details the finger-cluster assembly.
Figure 53 Circuit Breaker Removed, Featuring Primary Disconnects "Fingers" (Contacts)
Figure 54
Circuit Breaker, Fingers (Some Details)
contact finger
Remove and Theprimary disconnect assembly is factory-adjusted to apply a 95 + 10 Ib. force to a1/2-inch
Replace thick copper bar, inserted between the upper and lower fingers. Set this force range, in the
field, by tightening the nuts to set the spring dimension shown in Figure 55. Note that this
dimension is measured between the top of the retainer and the underside of the washer.
Also note that no bar is inserted between the fingers when setting this dimension. Figure 56
shows the cluster components.
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