Emerson ASCO ATS Switchboards, ASCO Three-Source System, ASCO Two-Source Automatic Transfer System, ASCO Custom Applications Brochures and Data Sheets
Suitable for Emergency, Peak and Prime
Power System Applications
TTHHEE PPOOWWEERR AAUUTTHHOORRIITTYY
Low Voltage Automatic T ransfer
Switch Systems
THE POWER AUTHORITY
ASCO’s experience and commitment to excellence in
designing and building Emergency Power Control
Systems for any application has made us the premier
manufacturing and service organization in the world.
For over 100 years we have built upon a tradition of
providing our customers a full range of high performance and quality products. ASCO’s experience
spans the history of the power control industry and
since 1888 we have set the standard for the entire
industry. Our reputation as the leader in emergency
power control equipment speaks to the quality of our
products and the dedication of our people.
ASCO operates two modern facilities dedicated to
manufacturing low and medium voltage power control
systems. Located in Parsippany, New Jersey and
Stockton, California, these manufacturing plants
produce state-of-the-art power control systems for
emergency or standby power generation, peak load
shaving, prime power, parallel with utility, cogeneration, emergency load management and power
distribution. These products are designed and
manufactured to meet and exceed the demands of a
growing global market.
Our ongoing dedication to research & development
and extensive testing have confirmed ASCO products
as the industry standard. Since our beginnings this
same dedication has established ASCO as the
pioneering innovator in the emergency power control
industry. This commitment continues to set ASCO
apart as the company that stands at the threshold of
new technologies and has resulted in a long list of
industry firsts throughout the years.
ASCO has always been committed to providing a
full range of products with only one thing in
mind... transferring power from an available source to
a critical load. Telecommunications systems, data
networks, industrial processes and critical installations
demand proven emergenc y and standby po wer transfer
solutions. As the worlds leader in emergency and
standby power ,ASCO products and systems safeguard
your business... because we keep your power on.
Page 2
Fig. 1 Parsippany, New Jersey, USA
Fig. 2 Stockton, California, USA
Automatic Transfer Systems
Product Overview
Content Page
Service Entrance Rated Transfer System ............................................. 4
ATS Switchboard .................................................................................. 5
Two Source Automatic Transfer System .............................................. 6
Three Source ATS System .................................................................... 7
Three Source Priority System .............................................................. 8
Soft Load Transfer System ................................................................... 9
Custom Applications ....................................................................... 10-11
Page 3
For more information on ASCO Automatic Transfer Systems contact your
nearest ASCO source at 800-937-ASCO or visit our website at www.asco.com.
Service Entrance Rated Transfer System
ASCO service entrance rated transfer systems are designed
for automatic switching of loads between the utility source
and an alternate source of power. The transfer system also
contains a disconnect device on the normal source, plus a
disconnect link on the utility neutral, and a disconnect link
between neutral and ground. If the utility source is Y
connected, the voltage is greater than 250 volts phase to
neutral and the system continuous current is greater than
1000 amperes, the utility disconnect device will be equipped
with ground fault trip.
Figure 3 shows a typical service entrance rated transfer
system with a 1200 ampere automatic transfer switch and a
1200 ampere utility circuit breaker.
Product Features
• The utility disconnect device will be equipped with
ground fault trip if the voltage between neutral and
ground is greater than 250 volts, and the continuous
current is greater than 1000 amperes.
• Disconnect link for the utility neutral bus.
• Disconnect link between the neutral bus and the
ground bus.
• Meets all NEC requirements for service entrance
rating, and is labeled to UL 891 standards.
• Available up through 4000 amperes using ASCO
940, 962, 434, 436 and ASCO's new 7000 series
automatic transfer switches.
Page 4
Neutral
Disconnect
Link
Ground
Disconnect
Link
GFCT
Utility
Utility
CB
ATS
Emergency
Load
N
Ø
N
Ø
Fig. 4 One line diagram of the service entrance
rated transfer system shown in figure 3.
GFCT Ground Fault
Current
Transformer
ATS - Automatic
Transfer Switch
Acc. 28
Fig. 3 Service entrance rated transfer system.
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