ATC Service Entrance Rated MCCB & Power Breaker Based ATS

Select Units


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.

Technical Summary

  • 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


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

    4000A, and 5000A UL 891 listed

    UL 1008 listed up to 3200A

    4000A, and 5000A UL 891 listed
News & Events

View the latest company and product news, events and customer stories.


View the latest offers available on a range of Cat® equipment and genuine parts.

Social Media

Connect with us to learn more about our company, products, services and customers.

Branch Locations

With branches across the UK & Ireland, you can be sure that we’re never far away.


Effectively manage your equipment to reduce operating costs and improve efficiency.


Integrated technology can help you understand your equipment's output and help extend its lifespan.


Quick and easy financing with customised payment plans through Cat Financial.

Please share your feedback on!

Close window

We are committed to providing you with the best site experience possible.  Please take our brief survey to tell us how we are doing.

Thank you in advance for your time!