Generator Transfer Switches

A generator transfer switch transfers electrical loads between different power sources in critical power systems decade after decade.
ASCO Power Technologies’ low and medium-voltage transfer switches improve power availability, support new energy solutions, and streamline compliance across a wide range of applications, from small businesses to mission-critical facilities.

Developed from more than a century of backup power experience.

ASCO Power Technologies' generator transfer switches provide safe and easy power switching to keep your business running even during a power outage. Our wide range of solutions provide ultimate assurance for critical applications where reliability is key.

What is a generator transfer switch?

A generator transfer switch transfers electrical load between power sources to help assure power availability when one source becomes unavailable. This enables continued operation, even when utility outages occur. Automatic models detect outages, start the generator, and then automate the transfer without human intervention.

They are installed in a building’s power distribution system upstream of electrical loads and downstream of two power sources, such a utility feed and a generator.

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Transfer Switches that are easy to select, obtain, operate, and own

Different transfer switch types offer unique advantages to enhance power availability according to facility requirements.

Automatic Transfer Switches

An automatic generator transfer switch transfer loads to an alternate power source without operator input when outages occur.

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Manual Transfer Switches

A manual generator transfer switch is a cost-efficient solution for operator-initiated load transfer.

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Bypass-Isolation Transfer Switches

Enable generator transfer switch service without interrupting power to loads.

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Service Entrance Transfer Switches

A service entrance generator transfer switch integrate a utility service breaker to save space and streamline installation.

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Custom Transfer Switches

Optimize transfer switches by providing bus riser, source fuses, power meters, and other features for any application.

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Rigorously Tested

Withstand severe conditions

UL-Listed ASCO Transfer Switches are tested to UL 1008 and/or IEC 60497 standards to verify that they can supply the required of reliability and power availability.

Solve two problems with one solution

Service entrance models save space requirements and streamline installation

Get exactly what you need

Custom-engineered solutions add functionality and value

Meet application requirements

Low-voltage and medium-voltage models up to 4000 Amps

Featured Products

Generator transfer switches for every application.

7000 SERIES Automatic Transfer Switch

Our most advanced solution for transferring all types of load in mission-critical applications.

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7000 SERIES Bypass Isolation Transfer Switch

Bypass and isolation capabilities enable generator transfer switch maintenance without disrupting power flow.

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ASCO 4000 series automatic transfer switch

SERIES 300 Manual Transfer Switch with Integrated Quick Connects

A versatile solution for connecting portable and temporary power sources to distribution systems.

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Creators of the first commercially available automatic transfer switch

ASCO Power Technologies proudly stands as the creators of the first commercially available automatic transfer switches (ATS). With a history of innovation spanning decades, we have transformed power management solutions for businesses worldwide.

Solutions for earthquake prone areas

Seismic-rated transfer switches can provide critical power to facilities in locations of greater seismic risk.

Get a “backup for the backup”

Facilities with only one generator can still obtain backup power when the generator is offline for service. ASCO Transfer Switches with Integrated Quick Connect Panels enable facilities to connect a temporary generator for redundancy and compliance.

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Unparalleled service

Transfer switch installation and service requires qualified personnel. ASCO provides installation, maintenance, and repair services using factory-trained, factory-employed technicians.

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Tools to learn more about Transfer Switches

Transfer Switch Self Help Hub

From product overviews to troubleshooting — the self-help hub directs you to resources and services quickly.

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ASCO Power in America

See the list of ASCO Power products that comply with Build America, Buy America, (BABA) Buy American Act, (BAA) and Trade Agreement Act (TAA) on this page.

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Find a technical document

Download generator transfer switch specifications, outline drawings, and wiring diagrams.

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Take a closer look

See our industry-leading transfer switches for generators and other power sources in 3D. ASCO’s interactive tool lets viewers zoom in on product details and learn their value.

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