Specifications

• Nominal voltage 120/240 V 60 Hz, single phase.
• Listed to UL1008 Transfer Switch Equipment and CSA Certified to CSA 22.2 No. 178-1978 Automatic
Transfer Switches.
• Meets National Electrical Code (NEC) and National Fire Protection Association (NFPA) requirements.
• True double-throw contacts (no intentional off position), with inherent mechanical interlocking to
prevent connection of generator and utility source.
• Convenient terminals to connect neutral and ground conductors from service and load feeders.
• Available in Type 1 (indoor) and Type 3R (outdoor) enclosures.
• Available from stock.
Product Features
Time Delay Functions
The 165 Automatic Transfer Switch has a unique built-in automatic digital diagnostic monitoring system, which
provides status on potential system problems such as: generator failed to start; generator over frequency;
transfer switch did not transfer; and more. It’s one more way you can count on ASCO to provide continuous
power protection ...anytime.
Control Panel
Diagnostic Indicators
• 3-second time delay to override momentary utility source.
• 15-second transfer to emergency time delay to allow engine generator to stabilize after starting.
• 15-second time delay after transfer to the standby source to ignore momentary voltage dips on the generator
during initial loading.
• 5-minute time delay on retransfer to allow utility source to stabilize prior to transferring the load back to utility
• 1-minute unloading running time delay for engine generator cool-down before shutdown.
Residential/Light Commercial
Automatic Transfer Switches
User-friendly control panel with
easy to understand symbols
and all the necessary visual
indicators to inform the operator
of transfer switch and power
source status.