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Optimizing Circuit Breaker Instantaneous Trip Settings for Selectivity and Arc Flash Performance Simultaneously

Marcelo Valdes, PE,
Steve Hansen,
and Dr. Peter Sutherland, PE

OSZ4 Instruction Sheet

OT(1-4) Average Melting Curve

OT(10-15) Average Melting Curve

OT(125-200) Average Melting Curve

OT(20-25) Average Melting Curve

OT(250-400) Average Melting Curve

OT(30-600) Peak Let Thru Curve

OT(35-60) Average Melting Curve

OT(450-600) Average Melting Curve

OT(5-8) Average Melting Curve

OT(70-100) Average Melting Curve

OT30 Average Melting Curve

OTM(1-10) Average Melting Curve

OTM(15-30) Average Melting Curve

OTS(110-200) Average Melting Curve