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IEC Bimetallic Overload for Open Delta

Issue:
Which type of IEC Bimetallic overload relay should be used on a high-leg delta system?

Product Line:
LRD Overloads - GIC Product

Environment:
US Product

Cause:
Product Selection

Resolution:
Bimetallic LRD units without single phase sensitivity should be used for open delta (high-leg delta) systems.  Standard single phase sensitive LRD units can nuisance trip in these systems due to imbalance.  It is important to note the LRD units without single phase sensitivity will also not have phase loss protection.  An appropriate separate phase loss relay should be selected to provide this type of protection.
 
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