Low Voltage Trip Unit Replacement

The collage on this page represents the different stages to rebuild and installation of a Utility Relay AC Pro II Trip Unit into a General Electric Powerbreak breaker (circa 1991). The installation requires the disassembly of the breaker to install the AC Pro II CTs. The Micro Versa Trip RMS 9 utilizes 5 AMP CT secondaries and the AC Pro II has 1 AMP CT secondaries.

While the breaker is disassembled the breaker contact surfaces are inspected, cleaned and any nominal pitting or arcing slag is removed. The surface of the contacts are tested afterwards with litmus paper to insure full connection across the surfaces.

Manual charging, close/trip functions, auxillary functions such as electrically charging, Under Voltage Release and Bell alarms are also tested.

The breaker is then meggered; doctored, high current injected and trip unit is tested via the A C Pro II Secondary Trip Unit Test Set.

The cost of refurbishment is less than 25% of a retrofill replacement breaker. The AC Pro II offers standard options for current only, power and Ethernet/Serial communications. Currently the only retrofill offer for the Powerbreak is the ABB Powerbreak II and that breaker was designed in 1995.

The work can be completed in the Paragon Shop or remotely, provided the customer has a large clean work area.