ASCO Series 300 Group G Service Entrance Power Transfer Switch

The ASCO Series 300 was designed to automatically transfer critical loads in the event of a power outage. It is also designed to handle total system loads including motors and other high inrush and inductive loads.

The ASCO Series 300’s 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 ASCO Series 300 assure the user of many years of reliability through its rugged construction and proven performance.​


Suitable for use as service entrance equipment. Listed to UL 891 (standard for switchboards) for 600 – 3000 amps, sizes and UL 1008 (standard for panel-boards) for 70 – 400 amps.

  •  Automatic Transfer Switch is listed to UL 1008 for total system loads.
  • Sizes available from 70 – 3000 amps, 600 VAC, 50 or 60 Hz, single or three phase.
  • Silver plated copper ground and neutral bus with solderless screw type terminals.
  • Ground fault trip protection provided on sizes 1000 amps and above.
  • Available with solid or switched neutral

Products 400 amperes or less, utilize a single enclosure including a service (utility source) disconnect circuit breaker, as well as the power transfer switch, grounding and bonding provisions. Products 600 amperes and above, utilize a multi-section switchboard construction including a service equipment section containing the service (utility source) disconnect circuit breaker, grounding, and bonding provisions. A second section contains the power transfer switch.

Other products you may be interested in