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Auto Transfer Panel ATC Breaker

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 Service Entrance Rated MCCB & Power Breaker Based ATS

Cat® Service Entrance Rated (SER) automatic transfer switches (ATS) are designed to provide standby power emergency power to entire installation loads to protect against utility power interruption; yet allow the ATS to be as close as possible to the point of service entrance. By safely and in code compliance, integrating the necessary overcurrent protection and service disconnecting means into the automatic transfer switch, a single installation can be made at the service entrance. This design eliminates the need for a separate upstream fault protection and respective interconnections, which in turn reduces installation space, time, and cost. Breaker-based Service Entrance Rated transfer switches are available from 30A to 5000A.

  • Specification Summary

  • Rating Range 30-5000A
  • Transfer Type Open / Closed / Delayed
  • Switch Type Molded Case and Power Breaker
  • MCCB 30-1000A 2, 3, or 4 Pole
  • Specification Sheet


Product Details

Technical Summary

Rating Range 30-5000A
Transfer Type Open / Closed / Delayed
Switch Type Molded Case and Power Breaker


MCCB 30-1000A 2, 3, or 4 Pole
Fixed Mount Power Breaker 200-3200A 2, 3, 4-Pole
Drawout Power Breaker 200-5000A 2, 3, or 4-Pole
System Voltage Application 120-600 Vac 50/60 Hz
Withstand (Power Breaker) Up to 100 kAIC at 600V 3 cycles
Applicable Testing
UL 1008 listed up to 3200A

4000A, and 5000A UL 891 listed
  • 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 supplie
  • Available Options
    •  Open, closed or delayed transition
    •  Integral overcurrent protection
    •  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
    •  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

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