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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.

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

Product Features

  • ATC-100 on Residential & Light Commercial MCCB based, ATC-300+ or ATC-800 on MCCB & Power Breaker ATS products
  • UL 1008 service entrance listed (up to 3200A)
  • Service disconnect (both off) capability
  • Integral over current protection
  • Lockout when in disconnected position (only)
  • Service entrance labeled
  • Integrated Design
  • Disconnecting neutral assembly
  • Ground fault protection capability (all ratings)
    (Required by code on rating 480V, and 1000A or higher)
  • Keyed service entrance switch
  • Draw-out type breakers (available on Power Breaker ratings)
  • UL 891 for 4000-5000A
  • Loads protected against extended power loss
  • Quick restoration of the circuit after a trip (versus a fused circuit that requires fuse availability)
  • Trip on a fault prohibits transfer to the emergency source
  • Fused circuit allows switch testing by simulating an actual power failure
  • Lockable disconnect position permits safe downstream maintenance

ATC Service Entrance Rated MCCB & Power Breaker Based ATS Standard Equipment

Controls and Wiring
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  • 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.

ATC Service Entrance Rated MCCB & Power Breaker Based ATS Optional Equipment

Available Options
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  • 4-position test switch
  • Remote communications
  • Surge suppression
  • Selectable automatic or non-automatic operation
  • Seismic Zone 4 Qualified (BOCA, CBC, IBC, UBC and OSHPD)
  • Communications for the ATC-300+ controller via RS-232 or Modbus through an integrated RS-485 port
  • Field selectable, multi ratio, control voltage transformer 50/60 Hz
  • Load sequencing contacts
  • Multi-meter options available
  • Open, closed or delayed transition
  • Space heaters
  • Integral overcurrent protection