The high-temperature resistant F-class DRG motors are asynchronous machines in which the winding insulation is chosen from a material with high thermal endurance and which are designed to run safely in hot environments. Class F insulation is the basis of their suitability for severe thermal conditions.

What Is Class F Insulation?

Under the IEC standard, insulation classes define the maximum temperature the winding can withstand. Class F corresponds to a 155 °C limit, providing a thermal margin above the 130 °C of Class B. Under high ambient temperature or heavy load, this reserve protects the winding's life.

Why Thermal Endurance Matters

The life of winding insulation is inversely related to temperature; every few degrees of overheating shortens it noticeably. Thanks to its margin, Class F material lets the motor run safely for long periods in hot areas such as furnace surroundings, foundries or boiler rooms.

Cooling and Protection Design

DRG's F-class motors are built with a cast iron frame and IP55 protection. The cast iron carries heat to the outer surface and lowers the winding temperature, while a rear-mounted fan provides forced cooling. The motor serves continuously under full load in the S1 duty cycle.

DRG's Solution for Hot Environments

DRG Motor offers F-class insulated motors from 0.55 to 355 kW, with custom configurations available for an even greater thermal margin where required. Contact DRG to select a motor suited to your hot working environment.