Sizing Guide for Dry Type Transformers

Single Phase Transformers

Primary Voltage

Main Breaker kVA Rating Primary Lugs Secondary Lugs

208V 80A 15 100A 100A208V 150A 25 250A 250A208V 200A 37.5 250A 250A208V 225A 50 400A 400A

240V 80A 15 100A 100A240V 150A 25 250A 250A240V 200A 37.5 250A 250A240V 225A 50 400A 400A

Three Phase Transformers

Primary Voltage

Main Breaker kVA Rating Primary Lugs Secondary Lugs

208V 60A 15 100A 100A208V 100A 30 250A 250A208V 150A 45 250A 250A208V 225A 75 400A 400A208V 400A 150 400A 600A

480V 60A 15 100A 100A480V 100A 30 100A 250A480V 150A 45 100A 250A480V 225A 75 250A 400A480V 400A 150 250A 600A

This chart is meant to offer recommendations only and is not an acceptable substitute for an electrical engineer.