Transfer Switch Generators

ASCO SERIES 300 Power Transfer Switches

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.


  • The SERIES 300 is listed to UL 1008 standard for Transfer Switch.
  • Equipment and CSA standard C22.2 for automatic transfer switches.
  • Meets NFPA 110 for Emergency and Standby Power Systems and the National Electrical Code (NEC) Articles 700, 701 and 702.
  • 30 through 3000 amps in a compact design.
  • Available to 600 VAC, single or three phase.
  • 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.
  • 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.   (See more in the brochure)