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Can HOM and QO CAFI breakers be used on 208Y/120 systems?

Issue:
Can CAFI breakers be used on 208V systems?

Product Line:
Circuit Breakers

Environment:
Applies to QO and HOM breakers with CAFI and DF suffix

Resolution:
1-pole QO and HOM breakers with CAFI or DF suffix are approved for use on the following:
  • 120/240Vac 1Ø3W system
  • 208Y/120Vac 3Ø4W system

2-pole QO and HOM breakers with CAFI suffix are approved for use on the following:
  • 120/240Vac 1Ø3W system

NOTE: There is not a standard to test or validate 2-pole CAFI breaker on 208V systems. Therefore 2-pole CAFI breakers are NOT for use on 208Y/120Vac systems, as indicated by the label on the front face of 2p CAFI breakers.
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