GE Industrial Solutions AMCB4QD, AMCB6QD User Manual

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DEH065 Installation Instructions R02

Spectra Series™ Power Panelboards

Bolt-On Circuit Breaker Kits

Application

These instructions apply to bolt-on circuit breaker kits
with catalog numbers AMCB6QD and AMCB4QD.

For use with circuit breaker types TQD and THQD.

For use with circuit breaker cover kits AFP2QDD and
AFP3QDD.

Installation

WARNING: Danger of electrical shock or injury.

OFF

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

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 Spectra TQD and THQD circuit breakers into
Spectra APNB bolt-on–style interiors. The parts
included in these kits are listed in Table 1.

Item Description

1 A & C pole outer strap 2 2
2 A & C pole inner strap 2 2
3 Carriage bolt, 1/4-20 x 11/2"2 3
4 Conical spring washer, 1/4"2 3
5 Nut, 1/4-20 2 3
6 B pole strap 2 2
7 Inner mounting bracket 2 2
8 Thread-forming screw 8 8

9 Outer mounting bracket 2 2
10 Screw, 1/4-20 x 3/4"46
11 Conical spring washer, 1/4"4 6
12 Screw, #10-32 x 23/4"44
13 Lock washer, #10 4 4
14 Antiturn clip 2 3

Table 1. Parts included in kits AMCB4QD and AMCB6QD.

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

reference distance. The circuit breaker straps are

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

ower ahead of the panelboard or

inside the

ment or removing any component.

Qty. in

AMCB4QD

Qty. in

AMCB6QD

3. Install the circuit breaker straps. For three-phase
applications (kit AMCB6QD), begin installing the
breaker straps with the A or C phase poles, as shown
in Figures 1 and 2. Slide an antiturn clip [14] over the
square shank of a carriage bolt [3]. Insert the carriage
bolt assembly into the appropriate square hole in the
bus, so that the pin of the antiturm clip rests on the
front of the bus. Place the square holes in the inner
strap [2] and outer strap [1] over the bolt so that the
pin of the antiturn clip fits into the small holes on the
straps. Secure the assembly to the vertical bus with a
conical spring washer [4] and nut [5], leaving the
connection finger tight. Repeat the process for the
center pole straps [6] and the other end pole straps
[1, 2].

For single-phase panels, dc applications, and phase­balancing purposes (kit AMCB4QD), Table 2 lists the
possible configurations. Align the appropriate strap
assemblies [1, 2, 6] with the corresponding holes in
the vertical bus, as shown in Figures 1 and 2. Fasten
each strap assembly loosely to the vertical bus with a
carriage bolt [2], conical washer [3], and nut [4], as
described for the three-phase kit. When installing any
of the two-pole strap configurations in Table 2, be sure
to install the straps in standard phase-rotation order.
When installing a two-pole and a three-pole breaker in
a double-branch assembly, arrange the straps in the
typical three-pole configuration, as shown in Figure 1.

A Phase B Phase C Phase

XX

X* X*

XX

* Use for single-phase panels and dc

applications.

Table 2. Possible pole configurations with kit AMCB4QD.

4. Install the circuit breaker mounting brackets and
cover supports. Attach the inner breaker mounting

brackets [7] to the panel side rails with thread­forming screws [8], as shown in Figure 1. Tighten the
screws to 35 in-lb. Slide the uppermost slot on the
cover supports (supplied with the breaker cover kit),
with the mounting tabs oriented inward, onto the
outer mounting brackets [9] until they snap into
place. Cover supports can be easily removed by
inserting a screwdriver blade into the slot on the
underside of the mounting bracket assembly and
gently prying downward while pushing the support
off. Install the completed outer mounting bracket
assemblies on the panel side rails with thread-forming
screws [8], as shown in Figure 1. Tighten the screws to
35 in-lb.

Cover

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Figure 1. Mounting TQD and THQD circuit breakers into Spectra APNB bolt-on interiors.

Strap Mounting Side

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Cover

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Figure 2. Mounting TQD and THQD circuit breakers into Spectra APNB bolt-on interiors, assembly end view.