Will the LRD overload relay with single phase sensitivity protect a motor from single phasing?
Issue: Does the LRD overload relay line protect the motor from single phasing?
IEC contactors and starters
Products sold and used in the United States
Cause: Identifying product characteristics
These overloads meet the definition and requirements of single phase sensitivity as stated in IEC 60947. For the best protection if single phasing is likely to be present, use a phase failure relay in addition to the overload.