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Electric motor insulation classes explained

The electrical insulation system for wires used in electric motors and other equipment defines the maximum temperature at which the insulation can be operated for a sustained period of time without failing. In order for users to select the right motor according to the intended application, there are four common insulation classes in use, which are as follows:

A – 105°C

B – 130°C

F – 155°C

H – 180°C

These figures are calculated by taking maximum ambient temperature (usually 40°C), adding the maximum permissible temperature rise plus a hotspot margin of 10°C.

An electric motor will not necessarily fail the instant the insulation class temperature is reached, but doing so will significantly reduce the designed operating life of the motor.

For more information on electric motor standards, feel free to give us a call on 01621 868138 or email info@gibbonsgroup.co.uk and we’ll get right back to you.

Electric Motors

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