Troubleshooting the PowerPact B Circuit Breaker
Repetitive Tripping
Indication |
Probable Cause |
Checks or Repairs |
---|---|---|
SD |
The voltage of the power supply to the MN undervoltage release is too low or subject to significant variations. |
Check the power supply for the release. For example, a supply powering motors with high-power ratings can be unstable. If necessary, connect the release to a clean or stable supply. |
The power supply to an MX shunt trip is applied unintentionally. |
Compare the release connection with the installation diagram to make sure that it is correct. |
Circuit Breaker Does Not Close
Indication |
Probable Cause |
Checks or Repairs |
---|---|---|
SD |
MX shunt trip energized. MN undervoltage release not energized. |
Compare the release connection with the installation diagram to make sure that it is correct. |