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Automatic transfer switches
Bypass isolation contactor type automatic transfer switches
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Bypass isolation contactor type automatic transfer switches

Eaton’s Bypass Isolation Contactor Type Automatic Transfer Switches include dual automatic switching mechanisms that provide redundancy for critical applications. The ATS distributes electrical power to the load, while the automatic bypass serves as a backup. When the ATS is isolated for test, power is routed through the automatic bypass switch to ensure that critical loads remain powered without interruption.

Bypass isolation contactor type automatic transfer switches
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Learn more about ATS fundamentals
Continuous Current Rating
Up to 3000 A
System Voltage Rating
Up to 600 Vac
System Frequency Rating
50/60 Hz

Core features

  • Provides uninterrupted emergency power to life safety and other critical loads while allowing maintenance of the automatic transfer switch to be performed
  • Rated for 100-3000 A up to 600 V and is available in open delayed, open in-phase or closed transition
  • UL1008 and CSA 22.22 No. 178-1978 listed
  • Compartmentalized design provides enhanced worker safety
  • Automatic bypass switch and automatic transfer switch (ATS) provide unparalleled operational redundancy
  • Optional dual draw-out design that allows the ATS or automatic bypass switch to be withdrawn
  • Automatic and non-automatic operation modes

View design guide (layouts, technical data and application information)

Download commercial distribution catalog

Learn about power system design basics

Automatic transfer switches

Reliable, rugged, versatile and compact assemblies for transferring essential loads and electrical distribution systems from one power source to another.


Watch the following videos to learn more:

  • What is WCR in automatic transfer switches?
  • Choosing a transfer switch
  • Recent change to National Electric code
  • UL1008 Short-circuit WCRs

    Finding the right ATS has never been easier

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    Transfer switch 101

    Read our introductory guide to picking the right transfer switch for your environment
    Read white paper

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    With more than 100 years of experience, Eaton can engineer reliable solutions to meet the specific demands of your application—completely designed and customized to your needs

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