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Installation Instructions
The following instructions are for the installation of Siemens Type GB2 breakers (NGB2, HGB2 or LGB2) as
branch devices in a Switchboard or Type P4 or Type P5 Panelboard. The parts provided in this kit connect
Type GB2 breakers to 3-phase/3-wire or 3-phase/4-wire systems ONLY. Kit SGB2 is for shallow (P4)
installations; kit SGB2D is for deep (P5 and Switchboard Distribution Section) installations. This kit requires
3-3/4" of unit space.
NOTE: The breakers are NOT included in this kit and must be purchased separately.
DANGER
Hazardous voltage.
Will cause death or
serious injury.
Keep out.
Qualified personnel only.
Disconnect and lock off all
power before working on
this equipment.
1. Lock off power supplying this equipment
before working on it.
2. Refer to Figure 1
Remove the gutter covers and cover plates.
Figure 1
COVER
PLATES
GUTTER
COVERS
3. Refer to Figure 2
To mount a Siemens Type GB2 circuit breaker,
3-3/4" of empty unit space is required. To locate
the proper mounting position, measure from the
top deadfront support to the intended location of
the empty unit space (filler) on the deadfront.
Transfer this dimension from the deadfront
support along the Z-rail and mark. This will be
the unit space (as shown in Figures 3 & 4). After
marking the Z-rail, remove the deadfront rails.
DEADFRONT
SUPPORTS
Figure 2
Z-RAIL
DEADFRONT
RAIL
WARNING: Do NOT use with NGB, LGB or HGB breakers. ONLY use with NGB2, LGB2 or HGB2 breakers.
4. If an existing branch module occupies the same
location chosen for this kit, remove all of its
devices, components and parts.
5. Open the shipping box and inspect the contents.
THIS KIT CONTAINS THE FOLLOWING ITEMS:
ITEM
DESCRIPTION
A/C-phase Runback *
1
2
A/C-phase Strap
3
B-phase Runback *
4
B-phase Strap
5
GB2 Barrier Support Bracket *
6
GB2 Top Barrier
7
3-3/4" Cover Plate
8
Circuit ID Card
9
Card Holder
10
Blank Filler **
11
Bus Hardware Kit, 1/8" Strap to Section ** 1
12
#10-24 x 3/8" Hex Head Washer Screw
13
#10-24 x 1/2" Socket Head Cap Screw
14
1/4"-20 x 3/8" Hex Head Washer Screw
15
1/4"-20 x 5/8" Hex Head Washer Screw **
16 #8-32 x 5/8" Hex Head Washer Screw
17
Branch Neutral Connector ***
18 Branch Neutral Terminal Strip
*
Kit contains shorter units for shallow applications (SGB2)
or taller units for deeper applications (SGB2D).
** Application dictates amount of these components used.
*** SGB2D only
INSTALLING THE RUNBACKS
6. Refer to Figure 3
Locate (2) 0.228" diameter holes in the A-phase
bus 1.25" down from the top of the 3.75" empty
unit space selected. Insert (2) 1/4"-20 screws (see
mounting hardware kit instructions located in Item 11
for the proper length) through the two mounting
holes in the A/C runback (Item 1) and into the (2)
selected holes in the A-phase bus (orienting the
A/C strap as shown) and tighten. Repeat this step
to mount the second runback to the C-phase bus.
Insert one 1/4"-20 screw (Item 11) through the
mounting hole in the B-phase runback (Item 3) and
into the proper 0.228" hole located in the B-phase
bus, 1.25" up from the bottom of the 3.75" empty
unit space (orienting the B-phase runback as shown)
and tighten. Torque all hardware as specified on
the rear of the deadfront.
1
AØ
BØ
1.25"
3.75"
UNIT
(INLINE)
SPACE 2.50"
1.25"
3
11
Figure 3
-2-
INSTALLING THE MOUNTING BRACKETS
7. Reference Figure 4
Locate a 0.228" diameter hole in the left Z-rail
1.88" below the top of the empty unit space
selected. Insert a 1/4"-20 x 3/8" screw (Item 14)
through the barrier support bracket (Item 5)
mounting hole and into the selected hole in the
Z-rail (orienting the bracket as shown). Repeat
this for the second mounting bracket. Tighten
these two screws (Item 14).
AØ
1.88"
3.75"
QTY
UNIT
2
SPACE
2
1
1.25"
1
2
Z-RAIL
1
1
INSTALLING THE BARRIER & STRAPS
6
8. Reference Figure 5
6
Set the top barrier (Item 6) over the two barrier
6
support brackets (Item 5) such that the barrier
mounting holes align with the holes on the brackets.
2
Insert a #10-24 x 3/8" screw (Item 12) on each
side of the barrier and tighten. To install the
6
B-phase strap (Item 4), locate it in the center
4
opening such that the center hole lines up with
5
the mounting hole on the B-phase runback. Drive
a 1/4"-20 x 5/8" screw (Item 15) thru the strap and
2
into the runback and tighten. For the A & C-phase
1
straps (Item 2) take one and angle the mounting
1
side under the barrier such that the strap
mounting hole aligns with the appropriate hole in
the A-phase runback and the center hole of the
strap sits on the barrier locating pin (Figure 5a).
Drive a 1/4"-20 x 5/8" screw (Item 15) through the
strap and into the runback and tighten. Repeat
this for the C-phase strap as shown. Torque all
hardware as specified on the rear of the deadfront.
Figure 5
14
CØ
8
9
WARNING: Do NOT use with NGB, LGB or HGB breakers. ONLY use with NGB2, LGB2 or HGB2 breakers.
INSTALLING THE TYPE GB2 BREAKER
9. Reference Figure 6
Align the bottom of the Type GB2 Breaker with the
top of the barrier. Slide the breaker along until the
notch on the bottom of the breaker fully engages
the edge of the barrier (as shown in Figure 6a).
Once fully engaged, use #10-24 x 1/2" screws
(Item 13) to secure the breaker tabs to the properly
aligned straps. Torque all hardware as specified
on the rear of the deadfront.
BØ
CØ
(DEEP KIT
REFERENCE)
5
14
Figure 4
Figure 6
GB2
BREAKER
NOTCH
ENGAGEMENT
Figure 6a
12
15
7
13
4
2
15
LOCATING PINS
10
Figure 5a
-3-
GB2
13
BREAKER
GB2
GB2
6
BREAKER
BREAKER
BASE NOTCH
LINE STAB
3
(SHALLOW KIT
1
REFERENCE)
5
6
GB2
TOP
BARRIER
CENTER
A/C
PHASE
HOLE
STRAP
12-A-1031-01 Rev. 00
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