ATC Power Breaker & Case Switch Automatic Transfer Switch

ATC Power Breaker & Case Switch 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. The open transition power case switch-based Automatic Transfer Switch (ATS) will provide fully functioning transfer in applications where a momentary loss of power is acceptable on retransfer from emergency to normal power supply. The Cat power case switch-based ATS also permits periodic testing of the emergency source without interrupting power to the loads and are available from 200 to 5000.

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Technical Summary

Rating Range
200 to 5000A
Transfer Type
Open Transition
Switch Type
Power Breaker


Control Power
Fixed Mount 200-3200A 2, 3, or 4 Pole
Drawout 200-5000A 2-, 3-, 4-pole
System Voltage Application
120 - 600 Vac, 50/60 Hz
Time Withstand
85,000 for 30 cycles
100,000 amps withstand/closing/ interrupting at 600 Vac
Applicable Testing

CSA C22.2 No. 178 certified

IBC 2006, CBC 2007 and OSHPD

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
    • Open or closed transition
    • Suitable for service entrance
    • 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
    • Controller availability: ATC-100, ATC-300+,and ATC-800
    • 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