The insulation class defines what kind of material is being used according to temperature operation. Standard motors are manufactured according to Isolation B.
For the insulation class and temperature, please refer to below table,
Insulation class A E B F H
Max Tem（℃） 105 120 130 155 180
Winding rise Tem（K） 60 75 80 100 125
Performance（℃） 80 95 100 120 145
For example, when customer use insulation paper (polyester) DMD,PMP or other insulation material such as powder, varnish they could consider the motor's insulation class accordingly.
Covering pumps,compressor,dries,exhausters,transporters,mixers,grinder,mills,fan and other kinds of motors.
Pearl
Emily