1.RLKUIT low-voltage induction motor for submersible pumps, 18.5–800 kW

Country: Serbia · Model: 1.RLKUIT

Low-voltage squirrel-cage induction motor rated 18.5–800 kW, 400–690 V and 50 or 60 Hz, for driving submersible pumps. From 4 to 12 poles give low speeds, down to 500 rpm at 50 Hz, without a gearbox. Used in water supply, wastewater, land reclamation and drainage stations.

Designation: 1.RLKUIT
Rotor type: squirrel-cage
Power: 18.5–800 kW
Voltage / frequency: 400–690 V / 50 Hz, 60 Hz

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Technical specifications

Designation	1.RLKUIT
Rotor type	squirrel-cage
Power	18.5–800 kW
Voltage / frequency	400–690 V / 50 Hz, 60 Hz
Shaft height (frame)	225–400
Number of poles	4–12
Insulation class	F / B
Protection degree	IP55 (per site data)
Cooling	IC 411 (per site data)
Mounting	IM B3, B5, V1
Mounting dimensions	IEC 60072
Standard	IEC 60034-1

Specifications are taken from the manufacturer’s technical documentation. Updated 11/09/2026.

Description

A large pump with a big impeller diameter runs at low speed, so the wide range of poles, 4–12, is the main distinction of the series. Shaft height 225–400, class F insulation used to class B. According to the manufacturer's table the motor has IP55, IC 411 cooling and mounting IM B3, B5 or V1, mounting dimensions to IEC 60072 and requirements of IEC 60034-1. Such parameters correspond to an ordinary enclosed motor, not a sealed fully submersible machine. Most likely this means pumps where the flow part is submerged and the motor stands above the liquid level in vertical design V1, or the table was filled in from a template. The design, seals and permissible immersion depth should be clarified.

How to choose

The required speed decides first, then the power. For low-speed pumps take 1.RLKUIT with 4–12 poles, and for high-speed pumps and compressors with 2–6 poles there is 2.SRZKIT. At first- and second-lift stations and in irrigation systems, check the speed, mounting version, the pump's axial load on the bearings and the flange mounting dimensions. When replacing motors of Soviet pump units, take these data from the old nameplate.

Request a price and lead time

1.RLKUIT low-voltage induction motor for submersible pumps, 18.5–800 kW. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What power and voltage does the 1.RLKUIT motor have?

From 18.5 to 800 kW at 400–690 V and a frequency of 50 or 60 Hz.

What is the lowest speed available without a gearbox?

Down to 500 rpm at 50 Hz, because the number of poles reaches 12 (range 4–12). This is needed by large water supply and drainage pumps.

Is 1.RLKUIT a fully submersible motor?

According to the site, IP55 and IC 411, so it is an ordinary enclosed machine. The design, seal type and immersion depth are clarified with the manufacturer.

What mounting versions and shaft height?

IM B3, B5 and V1 with mounting dimensions to IEC 60072, shaft height 225–400.