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ATS ATC Breaker / Contactor

Caterpillar and your local Cat® Dealer are ready for all your power generation demands. From diesel and gas generator sets to uninterruptible power supplies, automatic transfer switches and electrical switchgear, our experienced worldwide dealer network can deliver the power systems and support you need.

ATC Molded Case Circuit Breaker & Molded 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 breaker-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 Open Transition MCCB & MCS types of ATS also permits periodic testing of the emergency source without interrupting power to the loads and are available from 30 to 1000 amperes.

Product Details

Technical Summary

Rating Range 30-1000A
Transfer Type Open transition
Switch Type Molded Case


Control Power 30-1000A 2, 3, or 4 Pole, 100% Rated
System Voltage Application 120 - 600 Vac, 50/60 Hz
Withstand 100,000 amps withstand/closing/ interrupting at480 Vac
Applicable Testing CSA C22.2 No. 178 certified
IBC 2006, CBC 2007 and OSHPD
  • 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, NEMA 3R and NEMA 12 are available with ATC-100 and ATC-300+ controllers. NEMA 4 is only available with the ATC-800 controller. The enclosures are Seismic Qualified (BOCA, CBC, IBC, UBC). The hinges have removable hinge
  • Available Options
    •  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
    •  Communications for the ATC-300+ Controller via RS-232 or Modbus through an integrated RS-485 port
  • 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
                        • Communications for the ATC-300+ Controller via RS-232 or Modbus through an integrated RS-485 port
                          • Optional Delayed Transition includes:
                            •  Time delay neutral
                            •  Pre-transfer signal with 1 N.O. and 1 N.C. contacts
                          Catepillar Equipments


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