Utility Relay AC-PRO

Replace Utility Relay’s AC-PRO Retrofit Trip Unit with an ETC-12

For generations, ETC has worked hard to provide its customers with products and services to keep their power system operating safely and reliably. In 1988 it introduced its flagship etc line of solid state retrofit kits. The latest addition to this product line is the ETC-12 which is a low-cost, high quality device that provides the latest in arc-flash safety and is fully reverse compatible with older generation etc trip units.

Our main concern has always been ensuring the safety of its customers. Our goal is to provide complete transparency into the growing list of ETC-12’s features and benefits, so our potential customers can make the best possible decision when choosing a product. The table below highlights the features and benefits of the ETC-12 solid state retrofit kits.  Please let us know if you have any questions.



Multi-Tapped CT’s are standard.
All programmers come equipped with full LSIG functions which can be defeated if not needed.
Numerous auxiliary devices are available and can be added at any time to a breaker equipped with an ETC-12. Most of these accessories are available at low cost and only require the addition of an auxiliary cable and a small control module. Examples of available accessories include:

  • Selective Zone interlocks for ground fault and short-time bands.
  • MODBUS communications.
  • Remote Trip device.
  • Latching trip relay.

Remote flashSAFE activation.


Audible feedback to indicate keystroke.
Simultaneous display of all three phases of current plus ground fault current.


All kits supplied with mechanical auto-reset actuators for no extra charge.
Standard flashSAFE arc-flash maintenance mode.
Remote flashSAFE activation module with lockable toggle is available as an option.
Standard – remote mountable display that leaves no redundant controls inside breaker cubicle, eliminating any need to open the door on an energized breaker.


Intuitive setup routine with prompts in plain English shown on a 4-line display. All current values shown in setup are displayed both as a percentage and in actual amps.

Trip Logging

Records and retains trip records for the eight most recent trips. The current on each phase, plus ground fault (if activated) at time of trip is displayed.


Removable display can be placed near the controls of a primary injection test set, allowing one technician to verify pickups and metering accuracy.
Test Mode which

  1. Precludes the logging of test trips.
  2. Allows test technicians to quickly defeat functions that interfere with their test.
  3. Eliminates the potential for human error by automatically restoring as-found settings.


Industry-standard MODBUS capability that can be addressed by any building management system or PLC that is capable of addressing a MODBUS device. ETC Provides a complete list of all MODBUS registers so it can be easily integrated into any compatible system.

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