Electrical Motors - Insulation Classes

Temperature and insulation classes

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An electrical motor will rapidly degrade if the internal temperature exceeds the insulation temperature limit.

Insulation Class Temperature Limits
(oC)
A1) 105
B1) 130
F2) 155
H2) 180

1) Hydroscopic insulation - avoided for open and outdoor locations - shortened lifetime if condensation in the insulation occurs

2) Non-hydroscopic insulation - preferred for open and outdoor locations, higher ambient temperatures ..

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Related Topics

  • Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units

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