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The FastBus System made easy
Overview
1
The Fast Bus system at a glance
Overview
Fast Bus is a 3phase busbar
system for power
distribution. The
modular design
provides the
flexibility needed to
fit your application.
Fast Bus also
carries domestic and
international
approvals, which
make it ideal for a
global panel design.
Fastbus helps provide for quick maintenance, reducing down time..
Adapter shoes can be easily snapped on or removed from the Busbars in
seconds and many of the starters and circuit breakers come preassembled from Siemens.
The Fastbus system can help you save
panel space by allowing you to wire and
mount circuit protection and motor
starters in a tight line.
Leave space for future
system expansion.
2
The 8US Fastbus system at a glance
Ideal for Large Systems
Overview
The Fastbus
System reduces
installation cost
and time by
improving
mounting
density in
panels and
speeding up
installation time
with faster
mounting and
fewer power
connections
3
The Fast Bus system at a glance

Current Ratings
 Standard busbar (5 x 20 mm) is UL recognized to 362 Amps @ 600V.
 Busbar can be stacked (10 x 20 mm) for high current applications up to 564 Amps @ 600V.

Bracing Ratings (maximum with busbar holder spacing of x inches)
Overview

65kA bracing ratings at 480V at a maximum of 400A.
 42kA bracing ratings at 480V at a maximum of 600A.
 10kA bracing ratings at 600V at a maximum of 600A.

Factory Assemblies for quick installation
SIRIUS 3RA Combination Starters up to 50HP
@ 575V
 Sentron Circuit Breakers (UL489) up to 250A

4
The Fast Bus system at a glance
Choosing components – Pre-assembled or kitted and ready to go.
Overview
3RA11 Non-Reversing and
3RA12 Reversing Combination
Starters –
Come pre-assembled and ready
to place on to the Busbar
assembly
FBCB Fastbus Circuit
breakers –
Offer a full range of Circuit
Breakers from 15A to 250A
pre-packaged on Fastbus
adapters and ready to place
on the Busbar
FBCB***M Fastbus Main Circuit
breakers –
Offers a full range of Main Circuit
Breakers from 100A to 250A prepackaged with Fastbus adapters
and ready for quick assembly
FBT250
Three Pole Lug Plate with cover
(8US1921-1AA00)
8US1921-1GA00 (FBC84) –Cover for the 8US1921-1A000
Provides terminals for the incoming supply
or to jumper from one run of Fast Bus to
another.
5
Designing a Fast Bus System
Step
1.
Determine the total amperage of the required loads
2.
Select method to power Fastbus
1.
2.
3.
Selection
3.
4.
5.
Purpose
1.
To decide between 362A and 564A busbar and main lug or
circuit breaker
2.
Determines how much busbar space will be taken up by the
incoming feed
3.
Determines how much busbar space will be taken up by
each starter
4.
Determines how much busbar space will be taken up by
each circuit breaker or lug kit
5.
Determines if multiple runs of Fastbus will be required to
handle all loads (Note any panel width limitations)
Circuit Breaker up to 250A
Main Lug up to 600A
If the sum of the loads is greater than 250A, a separately
mounted circuit breaker must be wired to a main lug kit
Select 3RA factory assembled combination starters for each
motor load
Select any additional circuit breakers or lugs required to
feed non-motor loads or motors greater than 100A
Select appropriate length busbar, busbar support kit(s),
insulation covers and any other required components
6
Step 1 – Determine total amperage of
required loads
Due to the nature of Fast Bus, most applications
are considered Group Installation per NEC 430-53
Selection
Group Installation is an approach to building multiple
motor control systems. In Group Installation, multiple
motor starters can be grouped under a short circuit
protective device. The 3RA Combination Starters have
been UL listed for Group Installation in conjunction with
Fast Bus.
A.
B.
Review the specification or line drawing to determine all of the loads in the circuit
Use the calculations below to determine the size to the Short Circuit Protective Device
Circuit Breaker Selection - Select a circuit breaker (CB) between:
Minimum CB size (per NEC430-110) = Sum of all motor Full Load Currents x 115%
Maximum CB size (per NEC430-53c) = 250% x FLC of the largest motor + FLC of all other motors
Fuse Selection - Calculate the maximum fuse size per NEC 430-53c:
Maximum Fuse size = 175% x FLC of the largest motor + FLC of all other motors
7
Step 2 – Select Method to Power Fast Bus
For Short Circuit Protection from 100 to 250A, we
recommend using the FBCB***M Fastbus Main
Circuit breakers –
Selection
These circuit breakers have the Fast Bus wires on the
load side. Incoming power wires can be fed through
the top of the enclosure directly to the line terminals of
the circuit breaker. A Rotary or Max-Flex handle
operator can be added to disconnect and lock the
breaker in the off position.
For Short Circuit Protection greater than 250A,
use the FBT*** Three Pole Lug Plate assembly with cover –
Provides terminals for the incoming supply from a separately mounted Circuit
Breaker or Fuse Block.
Breaker
Rating Width
FBCB100M 100A 107mm
FBCB125M
125A 107mm
FBCB150M
150A 114mm
FBCB175M
175A 114mm
FBCB200M
200A 114mm
FBCB225M
225A 114mm
FBCB250M
250A 114mm
Lug Kit
Rating Width
FBT250
FBT350
FBT600
440A
460A
560A
84mm
135mm
135mm
These lug kits could also be used to jumper from one run of Fast Bus to
another.
8
Step 2 – Select Method to Power Fast Bus
Working from components – Do it yourself
Selection
If you want to make the Main
Circuit Breaker assemblies using
circuit breakers you already have
in stock, then you can add the
FBS250108M (terminals on bottom
for the Main Circuit Breaker) or the
FBS250108 (terminals on top for
the Feeder Circuit Breaker)
FastBus Adapter to your
inventory.
This adapter will accept E and F
frame circuit breakers
9
Step 3 – Select Combination Starters
Starter Selection Process
Selection
 Non-reversing or reversing motor?
 Full Load Current of the motor?
 Control Voltage?
 Number of auxiliary contacts required on the MSP and on
the Contactor?
 The 3RA devices can be ordered without any auxiliaries or
they can be ordered with one SPDT contact block that plugs in
to the top front of the MSP and one NO contact block that
mounts to the front of the contactor
 We recommend using front mount or plug in auxiliary contact
blocks to keep the device width to a minimum
 Regardless of which version is ordered, additional auxiliary
contacts can always be added in the field
 These starters can also be built from stock components.

For quick component selection, use Section 5 of the catalog
to select a 3RA factory assembled version. To the right of the
3RA catalog number, you will find a list of the components
required for field assembly
 To see a detailed visual of how to assemble these starters,
see the next page or refer to pages 5/33 through 5/36 of the
catalog.
Pages 5/6 – 5/9
Non-reversing Width
3RA111
45 mm
3RA112
45 mm
3RA113
55 mm
3RA114
70 mm
Pages 5/14 – 5/17
Reversing
3RA121
3RA122
3RA123
Width
90 mm
100 mm
120 mm
10
Step 3 – Select Combination Starters
Working from components – Do it yourself
Examples of use
Size 102 (S0)
Size 101 (S00)
8US1
5
5
1
1
125
110
Selection
8US1
The two drawing show the use of
Sirius size 101 and 102
Combination Starters on an
8US1251-5DM07 Fastbus Adapter
(FBS2545)
3RA1921-1.
3RA1911-1A
3
3
2
3
3
4
2
4
8US1998-1BA00 Spacer
supports a size 101 or 102
contactor to the 8US Fastbus
shoe when used with the 3RV
MSP
11
Step 4a – Select Additional Circuit Breakers
or lug kits
Breaker
FBCB015
to
FBCB080
FBCB100
FBCB125
FBCB150
FBCB175
FBCB200
FBCB225
FBCB250
To feed non-inductive loads or motor loads
greater than 250A, we recommend using the
FBCB*** Fastbus Feeder Circuit breakers –
Selection
Circuit breakers with Fast Bus wires on the line
side. These breakers could feed:
• non-inductive loads up to 250 A
• motor loads not controlled by an
MSP/Contactor combinations (Soft Starters,
Drives, NEMA starters)
Kits of 3 individual lugs used to feed additional circuits or to jumper
from one run of Fast Bus to another. Also order the FBCB84 cover to
prevent accidental finger contact with the terminals.
FBT166-1
16-6 AWG
FBT122-1
12-2 AWG
FBT620-1
6-2/0 AWG
FBT6250-1
6-250 MCM
440A
FBT30350 3/0-350 MCM
460A
FBT300600 300-600 MCM
560A
FBCB84
Cover 84 mm wide =
FBC135
Cover 135 mm wide
Cover 270 mm wide =
180A
270A
400A
=
=
=
8US1922-1GA00
8US1922-1GA02
=
=
=
8US1921-2AC00
8US1941-2AA01
8US1941-2AA02
80A
100A
125A
150A
175A
200A
225A
250A
107mm
107mm
107mm
114mm
114mm
114mm
114mm
114mm
Lug Kits
Rating Width
FBT166-1 180A 12mm ea.
FBT122-1 270A 16mm ea.
FBT620-1 400A 24mm ea.
FBT6250-1 440A 21mm ea.
FBT30350 460A 51mm ea.
FBT300600 560A 51mm ea.
Covers for Lugs
FBC84
84 mm
FBC135
135 mm
8US1922-1GA02 270 mm
To feed circuits with separate short circuit
protection up to 440A, use the FBT*** Three
Pole Lug kits –
Cross Reference Numbers
Rating Width
15A 107mm
8US1921-2AA00
8US1921-2BB00
8US1921-2AD00
16.0 – 120 mm2
95.0 – 185 mm2
150.0 – 300 mm2
1.5 – 16 mm2
4.0 – 35 mm2
16.0 – 70 mm2
12
Step 4b – Select Additional Fastbus Adapters
for other control components
The 8US Fastbus system offers Adapter Shoes in various sizes so that you can
customize your own Fastbus assembly to your application. Some Adapter Shoes
come pre-wired and some without wire so that you can size the wire to your needs
or attach to another adapter to mount a connecting device.
Selection
Adapters for Sirius:
101 (S00)and 102 (S0) frame size (45mm width): 8US1251-5DM07 Pre-wired
(FBS2545)
8US1250-5AM00 Non-wired
(FBS0045)
103 (S2) frame size (55mm width):
8US1261-5FM08 Pre-wired
(FBS5055)
8US1260-5AM00 Non-wired
(FBS0055)
Long adapter for combination starters:
8US1261-5FP08 Pre-wired
(FBS5055L)
8US1260-5AP00 Non-wired
104 (S3) frame size (72mm width):
8US1111-4TM00 Pre-wired
(FBS10070)
13
Step 5a – Determine the required length of busbar
A.
Add the widths of all components that will be mounted to the busbar. Including :
A.
B.
C.
D.
B.
C.
E.
Main Circuit Breaker or Main Lug Kit
3RA Combination Starters
Feeder Circuit Breakers
Feeder Lug Kits
Adapters to hold other control products
Determine what additional length may be required for future expansion (if any).
Specify required bracing rating for the system to determine if intermediate supports are required.
A.
B.
C.
65 kA at 480V at 400A max
an intermediate support every 13 inches
42 kA at 480V at 600A max
an intermediate support every 13 inches
10 kA at 600V at 600A max
an intermediate support every 27 inches
This requires
This requires
This requires
D. Add the widths of all intermediate supports and end supports, which are 20 mm each.
E. Add all distances together to determine total length of busbar required.
14
Step 5b – Compare busbar length width available Control Cabinet space
A.
B.
C.
Make sure that the required busbar length will fit in your control panel.
If necessary, break the Fast Bus in to multiple runs within the cabinet.
When breaking in to additional runs, be sure to add the additional end supports to your overall
length calculation.
15
Selection of Busbar components
Mounting Components Required:
•1. End Support Kit - FBS400
•
•
•
Qty.(2) 5SH3533 End Covers
Qty.(2) 5SH3532 Holder for Edge Profile and End Covers
Qty.(2) 8US1923-2AA00 3 Pole Busbar holder with Outside Fixing
•2. Busbar Kit Choices:
•
A. FBB36
•
B. FBB60
•
C. 8WC5026
•
•
•
•
Qty.(3) 36 inches long x 5mm x 20mm Tinned Copper Busbar
Qty. (3) 60 inch long x 5mm x 20mm Tinned Copper Busbar
Qty. (1) FBSXP – Intermediate support kit
Cut your own Busbar
2 Meter x 20mm x 5mm Copper Busbar
•Optional Intermediate Support Kit
• FBSXP – Intermediate support kit
•
•
Qty.(1) 8US1923-2AA00 Busbar holder with Outside Fixing
Qty.(1) 8US1922-1AC00 Endcover
• Optional Ground Busbar Kits
• FBG36
•
•
•
Qty.(2) – 5SH3506 - Ground busbar holders
Qty.(1) – 36 inch long x 6mm x 6mm Busbar (135A)
FBG60
•
•
Qty.(2) – 5SH3506 - Ground busbar holders
Qty.(1) – 60 inch long x 6mm x 6mm Busbar (135A)
16
Selection of Busbar components
17
Selection of Busbar components
Additional
Coverings
18
The 8US Fastbus system at a glance
Modular Design
Flexibility
to lockout the starters required (Rather than lock the entire panel down) Increase
productivity.
Incoming coordinated and tested Circuit Breakers
No
fuses to buy and replace – Decreased downtime and hard wiring costs.
Finger-Safe Protection
Protective channel prevents accidental contact with busbars
Busbar insulation helps to safely leave room for expansion
19
Fastbus Basics
Basic assembly
8US1923-2AA00 Busbar
Supports with Outside
Fixing, two needed per
meter or yard of Busbar
What you need to get started:
FBS400
Qty.(2) 5SH3533 End Covers
Qty.(2) 5SH3532 Holder for Edge Profile
Qty.(2) 8US1923-2AA00 Busbar holders with
Outside Fixing
Bus Bar Choices
1. FBB36 - Qty.(3) 36 inch long x 5mm x 20mm Tinned
Copper Bar
2. FBB60 – Qty. (3) 60 inch x 5mm x 20mm Tinned
Copper Bar + Qty. (1) FBSXP – Intermediate support kit
(required for >1m system)
3. 8WC5026 – 2M x 20mm x 5mm Copper Busbar
5SH3532 Holder for the 5SH3531
Partition
5SH3531 slotted partition. Can be
attached on top or bottom of 5SH3532
5SH3533 End cover for 3 Busbar System
5SH3534 End Cover for 4 Busbar System
20
Fastbus Basics
Bus Bar Choices
1. FBB36 - Qty.(3) 36 inches long x 5mm x 20mm Tinned Copper Bus Bar
2. FBB60 – Qty. (3) 60 inch x 5mm x 20mm Tinned Copper Bus Bar + Qty. (1)
FBSXP – Intermediate support kit (required for >1m system)
Basic assembly
3. 8WC5026 -
2M x 20mm x 5mm Copper Busbar
View from the side:
When assembling the 8US1923-2AA00
Holder, it can be adjusted to fit the size
of Busbar you are using. Once the
width matches your Busbar the
adjustable piece can be locked in place.
The 8US1923-2AA00 can be adjusted
to hold 12mm x 5 mm Busbar to 30mm
x 10mm. 20mm x 5mm Busbar is
standard in the US. Busbar can be
stacked (20mm x 10mm) for increased
current carrying capabilities.
5SH3506 Ground/Neutral
busbar holder. The 5SH3506
can be either mounted with the
8US1923-2AA00 (as shown) or it
can be mounted separately to
allow for extended busbar adapter
shoes.
5SH3532 Holder for the
5SH3531 Partition and/or
the 5SH3533 (3Pole) and
5SH3534 (4 Pole) end
covers
5SH3533 End cover
for covering 3 pole
Busbar ends
21
Fastbus Basics
Basic assembly
5SH3531 (slotted) or
5SH3528 (closed) Partition
should fit snug and flush to the
5SH3533 End Cover as
shown. Both are designed to
restrict accidental access to
live Busbar
5SH3533 End Cover
8WC5020 6mm x 6mm x 2 M
Copper Busbar
Ground Busbar Kit Choices
FBG36
Qty.(2) – 5SH3506- Ground busbar holders
Qty.(1) – 36 inch long x 6mm x 6mm Busbar (135A)
5SH3506 Ground Busbar Holders
FBG60
Qty.(2) – 5SH3506- Ground busbar holders
Qty.(1) – 60 inch long x 6mm x 6mm Busbar (135A )
22
Fastbus Components
 8WC5026 20mm x 5mm Copper
Busbar
Overview
Available in 2 meter lengths
Rated 362 amps @ 600VAC for
UL/CSA
564 amps with Double busbars
Rated
 FBB36 - Qty.(3) 36 inches long x 5mm x 20mm Tinned Copper
Bus Bar
 FBB60 – Qty. (3) 60 inch x 5mm x 20mm Tinned Copper
Bus Bar + Qty. (1) FBSXP – Intermediate support kit (required for
>1m system)
Wiring Terminals
3
terminals with covers for wire sizes
16 - 2 AWG
Individual terminals for wire sizes 16
- 250 MCM
3-pole lug plate with cover for wire
sizes 2 - 250 MCM and 3/0 - 600 MCM
23
Fastbus Basics
Ease of use with 8US Fastbus
Examples of use
Adding and
removing Busbar
adapters made
easy…
When stacking two
Busbar together for
increased current
ratings the tabs of the
Busbar adapter
connectors can be
broken off to fit 10mm
thick Busbar
Simply place the
adapter over the
Busbar and push down
until adapter locks in
place
Adapter
S00 (S0): Mounting
Montage
Adapter
removal
S00
(S0): Demontage
10 mm
8US1.51-5DM 07
When removing the Fastbus
Adapter from the Busbar,
push in the Locking tab on
the bottom of the Shoe and
push the adapter upwards
24
Fastbus Basics
Group Installation
according to NEC
430.53
One of the most common uses for
Fastbus is multi-motor
applications. Fastbus offers a
great solution when applied in
accordance with National Electric
Code section 430.53.
We offer a full line of Main Circuit
Breakers from 100 A to 250 A
mounted on Fastbus shoe
adapters.
Since our 3RV Motor Starter
Protectors are listed for Group
Installation they eliminate the need
for an additional branch circuit
protector for each motor
Main Circuit
Breaker feeding the
Busbar Assembly
sized according to
NEC 430.52
Branch Circuit
Breaker for
Power
Transformer
3RA11 Combination
Starters can be used for
Single Motor Taps in
accordance with NEC
430.53 (D) (3) since the
3RV Manual Motor
Controller’s are labeled
“Suitable for Tap Conductor
Protection in Group
installations” as well as
Listed for Type E when
using the 3RV1928-1H or
3RT1946-4GA07
Busbar
cover for
covering
open Busbar
25
Fastbus Basics
Here is a good
example of
how to control
multiple
motor loads
using Fastbus
Multiple Busbar runs
can be connected by
using the 8US19211AA00 Three Pole
Lug Plate assembly
26
Advantages of Siemens Fastbus System
 Initial Build Cost Savings
 Future Expansion Cost Savings
 Mean Time To Repair Savings
 Technical Benefits
27
Commercial Savings: B.O.M (Standard Panel Vs Fastbus)
SIEMENS Panel
Standard Panel
QTY
DESCRIPTION
1 Disconnect, Panel, Flange, 100Amp - 600 Volt
Customer
Price
EXT.
$90.42
$90.42
DESCRIPTION
For Class J Fuses
MFG.
EXT.
MAIN CIRCUIT BREAKER 100A FBCB 100M
SIE
$120.16
3RA11 FASTBUS COMBINATION STARTER
SIE
$172.39
3RA11 FASTBUS COMBINATION STARTER
SIE
$73.69
1 Block,Fuse, Class J, 3 Pole, 61-100Amp
$34.07
$34.07
3RA11 FASTBUS COMBINATION STARTER
SIE
$73.69
2 Block,Fuse, Class J, Cover,Touchsafe, 1 Pole, 600 V,30Amp
$6.78
$13.56
FLANGE MTD DISC WITH CABLE
SIE
$113.93
3 Fuse, Class J, 600 Volt, 3Amp
$4.35
$13.05
BUSBAR INSULATION FBC72
SIE
$11.87
3 Fuse, Class J, 600 Volt, 6 Amp
$4.35
$13.05
3 Fuse, Class J, 600 Volt, 80 Amp
$15.35
$46.05
400A COPPER BUSBAR FBB36 ( 36 INCHES )
SIE
$18.38
BUSBAR SUPPORT KIT FBS400
SIE
$14.74
3 Fuse, Class J, 600 Volt, 100 Amp
$15.35
$46.05
1 Block, Pow er Distribution, 3 Pole, 600V
$62.80
$62.80
2 Contactor 3 Pole 9 amps
$37.21
$74.42
2 Overload Bi Mettallic
$41.01
$82.02
1 Contactor 3 Pole 65 amps
$171.44
$171.44
1 Overload Bi Mettallic
$86.10
$86.10
TOT
$733.03
Copper, 1/#4 - 500, 6/ #14-2
TOT $598.85
Savings of $134.18 (22%) per panel
* Information taken from Customer case
study
28
Commercial Savings: Panel Build Labor
Standard Panel
Install 3 Fuse blocks 1.5 Hours
Install Starters
1.5 Hours
Install Disconnect
0.5 Hours
Install PDB
0.5 Hours
Install Plexiglas
1.0 Hours
SIEMENS Panel
Install Busbars 1.0 Hour
Install Starters 0.5 Hours
Install Breaker 0.5 Hours
Total
Total
2 Hours
5 Hours
At $30/Hour – Savings of $90 per Panel
* Information taken from Customer case study
29
Commercial Savings: Panel Space
SIEMENS Panel
Standard Panel
34"
34"
2 INCH WIRING DUCT
2 INCH WIRING DUCT
MAIN
DISCONNECT
100 AMPS
FUSIBLE
JTN60030
3 INCH WIRING DUCT
3 INCH WIRING DUCT
40 HP
1.5
HP
3
HP
3RA1140-4JD44
PWR. DIST.
BLOCK
3 INCH WIRING DUCT
3 INCH WIRING DUCT
3 HP
3RA1115-1ED15
5"
26"
3RA1115-1GD15
J60100-3COR
5"
M A IN
C IR C UIT
B R E A KE R
10 0 A M P S
FBCB 100M
21"
40 HP
23"
2 INCH WIRING DUCT
2 INCH WIRING DUCT
JTN60030
23"
19"
2 INCH WIRING DUCT
* Information taken from Customer case study
30
Commercial Savings: Mean Time To Repair Example
Standard Panel
Respond to Fault
15 mins
Siemens Panel
Identify blown fuse 5 mins
Locate Spare Fuse 10 mins
Replace fuse 10 mins
(Plexiglas)
Respond to Fault
Identify Fault
Total downtime
Total downtime
40 Mins
15 min
2 mins
17 mins
Worst case Tripped Breaker / Blown Fuse.
Approx $20,000 per minute downtime results in $460,000 savings.
* Information taken from customer case study
31
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