GE Industrial Solutions Finger Clusters - Manual (Page 4)

3 Finger Clusters (Assemblies) Accessory Manual DEH-41533 02/12
Description
The finger cluster assemblies are spring-loaded, flexible contacts that provide connection between
the breaker line and load terminals, and between the equipment line and load terminals. All finger
cluster assemblies are factory-installed and are assembled on EntelliGuard R Retrofill circuit
breakers. Use this instruction sheet if damaged fingers need to be replaced. It takes about 30
minutes to dismantle and reinstall a new set of finger cluster assemblies on each breaker.
Figure 1 shows finger clusters or primary disconnects on a retrofill circuit breaker. Figure 2 details the
finger-cluster assembly.
Figure 1. Circuit Breaker Removed, Featuring Primary
Disconnects “Fingers” (Contacts) Figure 2. Circuit Breaker, Fingers (Some Details)
Assembly and Components
The finger cluster assemblies are factory-adjusted with a gage to apply a 105-lb force to a 1/2-inch
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 3. 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 4 calls out cluster components.