ATC Power Breaker Bypass Isolation Open/Closed Transition Automatic Transfer Switch

ATC Power Breaker Bypass Isolation Open/Closed Transition Automatic Transfer Switch

Cat transfer switches are designed for a variety of standby power applications. They provide flexibility, reliability and value in a compact package. A Bypass Isolation Automatic Transfer Switch (ATS) provides fully functioning transfer in applications where emergency power to critical loads must be maintained at all times with no interruption. This type of design allows for inspection, maintenance or replacement of the power switching mechanisms with no interruption in electrical service. Breaker based Bypass isolation ATS are available from 200A to 5,000A.

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Technical Summary

Rating Range
Transfer Type
Bypass isolation, Closed transition
Switch Type
Power Breaker


Control Power
200-5000A, 2-, 3-, 4-pole
100% rated Short
System Voltage Application
120-600 Vac 50/60 Hz
Time Withstand
85,000 for 30 cycles
100 kAIC at 600V, 3 cycles
Applicable Testing
CSA C22.2 No. 178 certified
UL 1008 listed up to 3200A
4000A, and 5000A UL 891 listed

Standard Equipment

  • Controls And Wiring
    • All controls relays and industrial grade relays are totally encapsulated to minimize exposure to dust and dirt. Lugs are 90º rated and all control wire is #16 AWG, type XLPE with a 125º temperature rating.
  • Enclosure
    • Durable powder-coated steel NEMA 1, 3R or 12 enclosures with three door hinges to ensure proper support of the door and door mounted devices. The hinges have removable hinge pins to facilitate door removal for easy wall mounting or service and are supplied with pad-lockable latches.

Optional Equipment

  • Available Options
    • Integrated service entrance
    • Open or closed transition
    • Integral overcurrent protection
    • 2- or 4-position test switch
    • Multi-meter options available
    • Selectable automatic or non-automatic operation
    • Space heaters
    • Load sequencing contacts
    • Surge suppression
    • Remote communications
    • Seismic Zone 4 Qualified (BOCA, CBC, IBC, UBC and OSHPD)
    • Field selectable, multi ratio, control voltage transformer 50/60 Hz
  • Optional Delayed Transition Includes:
    • Time delay neutral
    • In-phase transition
    • Pre-transfer signal with 1 N.O. and 1 N.C. contacts