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ASCO Series 185 Residential/Light Commercial
Automatic Transfer Switches
Product Features
External Power Connections
1
1. UL listed for 200 or 230 amps with copper conductors
only.
For individual dwelling units as defined in NFPA 70 (NEC), in cases where
the transfer switch is between the service main disconnect and the lighting and
appliance branch circuit panelboard(s), NFPA 70 allows for a reductions in size of
the feeder conductors.
All other applicable requirements of NFPA 70 regarding conductor Ampacities
must also be adhered to. Always install electrical equipment to the require-
ments defined by the authority having jurisdiction.
Withstand and Close-On Ratings
Switch Rating
(Amps)
100
200
230
400
When Used With
Current Limiting
Fuses
200 KA
200 KA
100 KA
200 KA
When Used
With Circuit
Breakers
10 KA
10 KA
10 KA
35 KA
100
200
230
400
(1) #14 to 4/0 AWG
(1) #14 to 4/0 AWG
(1) #14 to 4/0 AWG
(2) 1/0 AWG to 250 MCM or
(1) # 4 AWG to 600 MCM
Switch Rating
(Amps)
Wiring Size
Range
• User-friendly control interface with intuitive
symbols and visual indicators to inform operator of
transfer switch and power source status
• Listed to UL 1008 for optional standby systems,
handling total system load including motors and all
other electrical loads
• cUL Listed for Canadian installations
• Meets Article 702, NFPA-70 National Electric Code
(NEC) requirements
• Nominal service voltage 240V 50/60Hz, single
phase, 3 wire AC systems
• Available in 100 through 400A ratings
• 200A and 400A Service Entrance designs feature
disconnect circuit breaker on normal source
• True double-throw contacts with inherent
mechanical interlocking to prevent connection of
generator and utility sources
• Terminals for convenient connection of neutral and
ground conductors
• Available in NEMA Type 1 Indoor (steel) and Type 3R
Outdoor (aluminum) enclosures, with hinged door
designs
• Suitable for controlling standby generators with
2-wire automatic starting circuits
• Available in manually operated version, up to 230A
• Available from stock
• 24 hour support, call 1-800-800-ASCO
ASCO SerieS 185 Rated 400 Amps in
Type 1 indoor (steel) enclosure
6
Time Delays
• Adjustable 1 or 3 second time delay to override
momentary normal source outages to delay all
transfer switch and engine starting signals
• Transfer to emergency time delay - fixed at 10 seconds
• Retransfer to normal time delay - fixed at 5 minutes
• Adjustable 2 or 5 minute unloaded running time delay
for emergency engine cooldown
• Four - second time delay to ignore momentary voltage
and frequency transients during initial genset loading