How do I size thermal units for an 8630 wye-delta starter?

Issue:
Selecting thermal units to protect the motor on an 8630 Wye-Delta starter

Product Line:
NEMA and Definite Purpose Contactors and Starters

Environment:
Magnetic Contactors and Starters

Cause:
Selecting heaters to protect the motor on an 8630 Wye-Delta starter

Resolution:
You must divide the motor full load current by 1.73 and size the heaters per the appropriate chart. Check current Square D publications for thermal unit selection chart.

Released for: Schneider Electric Canada