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There s no danger of the Series 300 ATS
transferring loads to a dead source
because the unique ASCO single-solenoid
operator derives power to operate from
the source to which the load is being
transferred.
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Easy-to-read flush-mounted control and
display panel provides LED indicators
for switch position and source availability.
It also includes test and time-delay bypass
switches as standard features.
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Standard engine exerciser for weekly
automatic testing of engine generator set
with or without load.
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Adjustable time-delay feature prevents
switch from being activated due to
momentary utility power outages and
generator dips.
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Supplied with solid neutral termination.
Optional switched neutral pole available.
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Accessory kits available.
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Available for immediate delivery.
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Now available for service entrance
applications. Contact ASCO for assistance.
UL Listed Withstand & Close-On Ratings
Maximum Reliability & Excellent Value
With a Series 300 Transfer Switch, you get a product backed by
ASCO Power Technologies, the industry leader responsible for virtually
every major technological advance in the Transfer Switch industry.
The ASCO Series 300 was designed for one purpose–to automatically
transfer critical loads in the event of a power outage. Each and every
standard component was designed
by ASCO engineers for this purpose.
The rugged construction and proven performance of the ASCO
Series 300 assure the user of many years of complete reliability.
The Series 300 is even designed to handle the extraordinary
demands placed on the switch when starting or restarting stalled
motors and switching high inrush loads.
ASCO s Series 300 modular, compact design makes it easy to install,
inspect and maintain. All parts are accessible from the front so switch
contacts can be easily inspected.
Features
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The Series 300 is listed to UL 1008 standard for Transfer Switch
Equipment and CSA standard C22.2 for automatic transfer switches.
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Meets NFPA 110 for Emergency and Standby Power Systems and
the National Electrical Code (NEC) Articles 700, 701 and 702.
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30 through 3000 amps in a compact design.
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Available to 600 VAC, single or three phase.
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True double-throw operation: The single solenoid design is inherently
interlocked and prevents contacts from stopping between sources
or from being in contact with both sources at the same time.
Fig. 2:
ASCO Power Transfer Switch
rated 200 amperes
Fig. 3:
ASCO Power Transfer Switch
rated 400 amperes
Fig. 4:
ASCO Power Transfer Switch
rated 1000 amperes
Fig. 6:
ASCO Power Transfer Switch
rated 3000 amperes
Fig. 5:
ASCO Power Transfer Switch
rated 2000 amperes shown in Type 3R enclosure
Series 300 Power Transfer Switches
Designed to Fit Anywhere
The ASCO Series 300 product line represents the most compact
design of automatic power transfer switches in the industry. With
space in electrical closets being at a premium, the use of wall or
floor-mounted ASCO Power Transfer Switches assures designers
optimum utilization of space.
All transfer switches through 2000 amps are designed to be
completely front accessible. This permits the enclosures to be
installed flush to the wall and still allows installation of all power
cabling and connections from the front of the switch. Cable
entrance plates are also standard on the 1600 and 2000 amp
units to install optional side-mounted pull boxes for additional
cable bending space.
Fig. 1:
ASCO Power Transfer Switch rated
200 amperes shown in Type 3R enclosure
5
4
30 - 200
200,000
480v/60Hz
22,000
230 100,000 480v/60Hz 22,000
260, 400
200,000
480v/60Hz
42,000
600,800,1000,1200
200,000
600v/60Hz
65,000
1600, 2000
200,000
600v/60Hz
85,000
2600, 3000
200,000
600v/60Hz
100,000
Switch Ratings
amps
Available Symmetrical Amperes RMS
When Used
With Current
Limiting Fuses
Maximum
Voltage
When Used
With Specific
Circuit Breakers
@ 480V/60Hz
Notes:
1. Current – limiting fuse should be Class J type through 400 amps:
use Class L type above 400 - amp fuse rating
2. Refer to publication 1128 for specific manufacture’s breakers
