GE Industrial Solutions AMCB4GB, AMCB6GB User Manual

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Application

These instructions apply to bolt-on circuit breaker kits
with catalog numbers AMCB6GB and AMCB4GB.

For use with circuit breaker types SGH, SGL and SGP.

For use with circuit breaker cover kit AFP4SGD.

Installation

WARNING: Danger of electrical shock or injury.

OFF

Turn
switchboard before workin
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Equipment is to be installed and maintained b
properly trained and qualified personnel only.

ower ahead of the panelboard or

inside the

ment or removing any component.

DEH40129 Installation Instructions R03

Spectra Series™ Power Panelboards

Bolt-On Circuit Breaker Kits

Figure 1. Parts included in the kits AMCB4GB and AMCB6GB.

In the following instructions numbers in brackets in the
text and figures refer to the items in Table 1.

1. Confirm the contents of the kit. These kits are used to
install double-branch G-frame Spectra circuit breakers
into Spectra APNB bolt-on–style interiors. The vertical
space required for each kit is 5.50 inches (4X).

Figure 1 illustrates the parts included in this kit, which
are listed in Table 1.

Item Part # Description

1 192A6976P189 Thread-forming screw, #10-32 x 7/16"44
2 252B3575P1 Circuit breaker mounting bracket 2 2
3 208C2291P1 Filler center 2 2
4 252B3613P1 Antiturn clip 2 3
5 252B3618G10 G Frame double strap 2 2
6 252B3618G11 G Frame double strap 1 1
7 75A105503P101 Conical spring washer, 1/4" 44
8 75A105503P105 Conical spring washer, 5/16" 46

9 DEH40129 Installation instructions 1 1
10 N22P23012B6 Hex-head bolt, 5/16-18 x 3/4" 46
11 N245P21B6 Nut, 1/4-20 2 3
12 N37P21969B6 Machine screw, 1/4-20 x 33/4" 44
13 N402P11B6 Flat washer, 1/4" 44
14 N657P21024B6 Carriage bolt, 1/4-20 x 11/2" 23
15 N730BP1308B6 Thread-forming screw, #6 x 1/2" 44

Table 1. Parts list for kits AMCB4GB and AMCB6GB.

Qty. in

AMCB4GB

Qty. in

AMCB6GB.

2. Locate the side of the interior with a 2.75-inch

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reference distance. The circuit breaker straps are
mounted on the side of the panel interior bus at
which the distance from the vertical bus face to the
inner face of the bus-support rail is 2.75 inches, as
indicated in Figure 2.

4. Three-phase installations. Use the following procedure
for all three-phase installations (kit AMCB6GB).

4a. Install carriage bolt assemblies. Position the

carriage bolt [14] and antiturn clip [4] assemblies
as shown in Figures 5 and 6.

Edge of G

Frame

Edge of G

Frame

Figure 2. Illustration of the 2.75-inch reference distance.

3. Assemble antiturn clips onto carriage bolts. Slide an
antiturn clip [4] over the square shank of each
carriage bolt [14], as shown in Figure 3. Figure 4
illustrates the installation of a bolt and antiturn clip
onto the interior, as called for in the remaining steps.

Figure 3. Assembling an antiturn clip [4] with a carriage bolt [14].

Figure 5. Carriage bolt and antiturn clip installation for three-phase

connections.

Figure 6. Carriage bolt and antiturn clip installation for three-phase

connections, isometric view.

4b. Install straps. Place the G frame straps [5, 6] over

the carriage bolts and antiturn clips, as shown in
Figures 7 and 8. Place conical washers [7] on the
bolts and secure with nuts [11]. Leave the
connections finger tight.

If the group assembly selection is three-phase and
the assembly looks like Figure 8, then go to step 6.

Edge of G

Frame

Figure 4. Installing a carriage bolt [14] and antiturn clip [4] into the

interior.

NOTE: For three-phase installations, continue
with ste

4. For two-pole installations, proceed

to step 5.

Edge of G

Frame

Figure 7. Installing the straps for three-phase connections.

Figure 8. Installing the straps for three-phase connections, isometric

view.