ASCO Series 185 Automatic Transfer Switch. 
 
Why Should You Choose An ASCO Automatic Power Transfer Switch?
 
Customer service, rock-solid dependability, and the industry’s highest performance have made ASCO the first choice in emergency power for more than 80 years.
 
Our power transfer switches are used in more emergency power backup systems worldwide than any other.
 
ASCO is the name behind most of the technological advances in transfer switch design, and we have more patents than all other manufacturers combined. ASCO transfer switches are the first choice for installations of every kind, from homes and small businesses to the largest financial data centers and hospitals in the world.
 
Performance Sets The Series 185 Apart
 
The Series 185 Automatic Transfer Switch incorporates the latest technology developed by ASCO for dependable operation in any environment
 
  
When utility power fails for just 1 second or more, the Series 185 Automatic Transfer Switch signals the generator to start
  
In less than 30 seconds your electrical power is normally restored
  
Once the Serie S 185 Automatic Transfer Switch senses utility power has reached an acceptable voltage level for a period of time, it automatically reconnects your power
  
It then smoothly shuts the generator down after an adjustable 2 - 5-minute cool-down period to extend generator life
  
The user-friendly control panel also allows you to manually run a test at the push of a button
  
LED indicators to let you know the availability of both power sources and transfer switch positions
 
ASCO Series 185 Residential/Light Commercial Automatic Transfer Switches

Product Features
  
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 design
  
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
 
Time Delays
  
Adjustable 1 or 3-second time delay to override momentary normal source outages to delay 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 minutes unloaded running time delay for emergency engine cooldown
  
Four - second-time delay to ignore momentary voltage and frequency transients during initial Genset loading
 
Optional Accessories
 
Strip Heater
 
A strip heater with a thermostat is recommended for extremely cold areas to prevent condensation and freezing of this condensation. An external 120-volt source is required
Ordering Information
 
ASCO Series 185 Residential Microprocessor Controller
 
Control and Interface Panel ASCO Sereis S 185 Microprocessor Controller
The ASCO group 4 Microprocessor Controller is used with all sizes of the Series S 185 Power Transfer Switches. Includes as standard all of the voltage, frequency, control, timing, and connectivity functions required for most optional standby power applications. 
 
Voltage And Frequency Sensing
  
Adjustable single phase sensing on normal source
  
Normal source pickup voltage is adjustable to either 198 volts or 209 volts; drop-out is adjustable to four incremental settings, 154 volts, 176 volts, 187 volts, or 198 volts
  
Frequency sensing on the emergency source. Pickup is 57 Hz (nom 60 Hz) or 48 Hz (nom 50 Hz), and dropout is 51 Hz (nom 60 Hz), and 43 Hz (nom 50 Hz)
 
Standard Selectable Features
  
Engine exerciser to automatically test backup generator each week - Includes control switch for testing with or without load
  
Selective load disconnect, double - throw contact to operate at an adjustable 0 - 20-second adjustable time delay prior to transfer and reset 0 to 20 seconds after transfer
  
60 Hz or 50 Hz selectable switch
 
Remote Control Feature
Terminal provisions for connecting
  
Remote test switch
  
Remote test switch with automatic transfer
  
Remote time delay bypass switch
Control And Interface Panel
  
User - friendly control interface with intuitive symbols and visual indicators to inform operator of transfer switch and power source status
 
Performance Features
  
240 volt spacing per UL and CSA standards
  
 
Meets or exceeds the requirements of the following regulatory agencies:
 

 • UL 1008
 
• CSA C22.2 No. 178
 
• IEC 60947-6-1
 
• NFPA 110
  
 
  
 
Meets or exceeds the requirements for Electromagnetic Compatibility (EMC)
 

 • IEC60947-6-1 and CISPR Radiated and Conducted Emissions
 
• IEC61000-4-2 Electric Discharge
 
• IEC61000-4-3 Electromagnetic Field Immunity
 
• IEC61000-4-4 Electrical Fast Transients
 
• IEC61000-4-5 Surge Immunity
 
• IEC61000-4-6 Conducted Disturbances
 
• FCC CFR 47 Part 15