GE Industrial Solutions Finger Clusters User Manual

GE Energy

Finger Clusters
Accessory Manual

Circuit Breaker Primary Disconnects

The primary disconnects are flexible connections between the breaker line
and load terminals, and between the equipment line and load terminals.

imagination at work

1 Finger Clusters (Assemblies) Accessory Manual DEH-41533 02/12

Table of Contents

Related Publications ......................................................................................................................................................2

Estimated Time to Complete Tasks ........................................................................................................................2

Description .........................................................................................................................................................................3

Assembly and Components.................................................................................................................................................... 3

Remove.............................................................................................................................................................................................4

Replace.............................................................................................................................................................................................4

Mechanical Views........................................................................................................................................................................6

Ordering Information ................................................................................................................................................................. 8

Notes.....................................................................................................................................................................................9

2 Finger Clusters (Assemblies) Accessory Manual DEH-41533 02/12

Related Publications

Publication

Publication Number

Brochure

DEA-532
Snapshot

DEE-543
Installation Manual AKD8

DEH-41549
Installation Manual AKD6

DEH-41548
Installation Manual AKD5

DEH-41547
Accessory: Door Interlock (Door Interlock Kit)

DEH-41529
Accessory Retrofill Doors Assembly

DEH-41563
Accessory: Position Switch Plate & Position Switch Assembly & Wiring
(Position Switch Kit)

DEH-41530

Accessory: Neutral Rogowski CT Disconnect (Neutral Assemblies)

DEH-41531
Accessory: Programmer Disconnects

DEH-41532
Accessory: Finger Clusters (Cluster Assemblies)

DEH-41533
Accessory: Secondary Disconnects

DEH-41534
FAQ

DEQ-171
Application Guide

DET-753
Guideform Spec

DET-754
Spare/Renewal Parts Guide

DET-755

Estimated Time to Complete Tasks

It takes about 20 minutes to install or replace the assembly.

WARNING: Improper Installation,
Operation, and Maintenance

• Ensure only qualified personnel install,
operate, service, and maintain all
electrical equipment.

• Do not adjust or install the cluster
fingers when the breaker is mounted
on the compartment rails or partly
inserted into the compartment.

• It should be ensured that the breaker has
been extracted from the compartment and
placed on a level table/floor before any
replacement or re-installation is
conducted.

• Failure to comply with these instructions
could result in death or serious injury.

• Ensure only qualified personnel install, operate, service, and maintain all electrical
equipment.

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.