conmgt
Senior Member
- Location
- 2 Phase Philly
Hello,
I need contactors for the primary side of a 30kVA transformer that is dedicated to an infrequently used motor (once a week-ish). I need to cut off the transformer to save on standby losses.
At 208V, the transformer draws about 84A. At first I figured a 100A contactor would be fine but while I was looking through a SqD catalog, I came across Table 16.49, Application Data for Selection which shows possibly that for switching a transformer, a NEMA size 5 contactor is recommended which is rated for 270A. Am I reading something wrong?
I need contactors for the primary side of a 30kVA transformer that is dedicated to an infrequently used motor (once a week-ish). I need to cut off the transformer to save on standby losses.
At 208V, the transformer draws about 84A. At first I figured a 100A contactor would be fine but while I was looking through a SqD catalog, I came across Table 16.49, Application Data for Selection which shows possibly that for switching a transformer, a NEMA size 5 contactor is recommended which is rated for 270A. Am I reading something wrong?