Electrical Motors - Insulation Classes

Temperature and insulation classes

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 ..

Related Topics

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

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