CEI EN IEC 60034-30-3:2025

This part of IEC 60034 specifies efficiency classes for fixed-speed three-phase high-voltage cage induction motors in accordance with IEC 60034-1 that • have a rated voltage exceeding 1 000 V, but not exceeding 11 kV; • have a rated power from 200 kW to 2 000 kW; NOTE 1 Motors with rated power above 2 000 kW are produced in such small numbers and are designed and produced with a focus on achieving an optimum efficiency anyway, even though fulfilling increasingly special requirements that assigning efficiency classes would be an additional effort without the result of any countable energy saving. • have two, four or six poles; • are rated for single-speed line-operation; • are intended for direct-on-line starting at rated or at reduced voltage and rated frequency; • are constructed to any degree of protection; • are designed for cooling methods IC411, IC511, IC611, IC01 or IC81W; • are capable of continuous operation at their rated operating point (torque/power, speed) with a temperature rise within the specified insulation temperature class; NOTE 2 Most motors covered by this document are rated for duty type S1 (continuous duty). However, some motors that are rated for other duty cycles are still capable of continuous operation at their rated power and these motors are also covered.