2.RZKIT — low-voltage induction motor for operation from a frequency converter, 18.5–2500 kW

Technical specifications

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The series is built on frame sizes with a shaft height from 200 to 630 and a number of poles from 2 to 8. The design is closed, IP55, with IC 411 self-ventilation from an impeller on its own shaft. Class F winding insulation works with a temperature rise within class B, and this reserve absorbs additional losses from higher current harmonics and the stress on turn insulation from the steep voltage fronts of the inverter. The motor is supplied foot-mounted IM B3, flange-mounted IM B5 or in the vertical IM V1 version. Connection dimensions to IEC 60072 and the general requirements of IEC 60034-1 simplify replacing a machine from another manufacturer in an existing drive without reworking the foundation or half-couplings. The change from throttling to frequency control on pumps and fans noticeably reduces energy consumption. The series is used in metallurgy, mining and chemical industry, water supply and wastewater.

How to choose

The main question in selection concerns the control range and the nature of the load. In long operation at low speed with constant torque, IC 411 self-ventilation weakens, so the thermal regime is checked by calculation, and an independent fan and insulated bearings are agreed with the factory using the questionnaire. If the drive runs from the mains without a converter, it is more sensible to take the IE3 3.ZKE at 18.5–1000 kW. Machines with an IC 611 heat exchanger at 400–2500 kW are separated into the special 2.RZKIT…ic6 version.