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ATC Contactor-Based Automatic Transfer Switch ATS ATC Breaker / Contactor

Rating Range
40-3000A
Transfer Type
Open / Closed Transition
Switch Type
Contactor Based

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Cat® transfer switches are designed for a variety of standby power applications. They provide flexibility, reliability and value in a compact package. The open and delayed transition contactor-based Automatic Transfer Switch (ATS) provides fully functioning transfer in Applications where a momentary loss of power is acceptable during transfer and retransfers between normal and emergency power supply.

The closed transition contactor-based ATS is designed to Meet application requirements where emergency back up power is required with no momentary loss of power by connecting both sources before the transfer occurs. Closed transition also permits periodic testing of the emergency power source without interrupting power to the loads.

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Product specifications for ATC Contactor-Based Automatic Transfer Switch ATS ATC Breaker / Contactor


Cat® transfer switches are designed for a variety of standby power applications. They provide flexibility, reliability and value in a compact package. The open and delayed transition contactor-based Automatic Transfer Switch (ATS) provides fully functioning transfer in Applications where a momentary loss of power is acceptable during transfer and retransfers between normal and emergency power supply.

The closed transition contactor-based ATS is designed to Meet application requirements where emergency back up power is required with no momentary loss of power by connecting both sources before the transfer occurs. Closed transition also permits periodic testing of the emergency power source without interrupting power to the loads.

Technical Summary
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Rating Range 40-3000A
Transfer Type Open / Closed Transition
Switch Type Contactor Based

Product Features

  • ATC-100, ATC-300+ or ATC-800 microprocessor-based controller
  • Voltage and frequency sensing
  • High withstand and closing ratings
  • Multiple field programmable set points
  • Status Display including switch position indication
  • Source availability indication
  • Source 1 and 2 auxiliary contacts
  • True RMS voltage and frequency sensing
  • Programmable plant exerciser
  • System test pushbutton
  • Mimic diagram
  • Double-throw, mechanically interlocked transfer mechanism
  • Switch position indication
  • Status display
  • Double-throw UL 1008 3-position contactors

ATC Contactor-Based Automatic Transfer Switch Standard Equipment

Contact Composition
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  • Caterpillar utilizes silver composition contacts designed to meet the stringent requirements of UL 1008. All contactors are designed so that the contacts can be visually inspected without major disassembly and are protected by arcing contacts.

ATC Contactor-Based Automatic Transfer Switch Optional Equipment

Available Options
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  • 2- or 4-position test switch
  • Controller availability: ATC-100, ATC-300+,and ATC-800
  • Delayed transition or closed transition
  • Multi-meter options available
  • Surge suppression
  • Space heaters
  • Field selectable, multi ratio, control voltage transformer 50/60 Hz
  • Selectable automatic or non-automatic operation
  • Remote communications
  • Load shed from emergency

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