Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara 4OS motor construction sections showing smaller and larger motor designs. Manufacturer family reference diagram.
Lowara 4OS motor construction sections showing smaller and larger motor designs. Manufacturer family reference diagram.
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara 4OS motor construction sections showing smaller and larger motor designs. Manufacturer family reference diagram.

LOWARA 4OS 4" SUBMERSIBLE REPLACEMENT MOTORS

Lowara 4OS replacement motors drive Lowara GS and other compatible 4-inch bore-pump ends for water supply and irrigation. They can replace a failed motor while retaining a serviceable pump section. Versions are available for single-phase and three-phase installations.

✓ Motor only. Pump end is separate
✓ Motor output: 0.37-7.5kW, depending on model
✓ Single-phase two-wire or three-wire, and three-phase versions
✓ Maximum motor submergence: 150m below the water surface
✓ Water temperature: up to 35°C
✓ Motor lead included. Control panel and cable jointing kit are separate

Lowara 4OS Motor Technical Data
Lowara 4OS Installation: three-wire single-phase and three-phase motors

More Information
Product Specifications
Lowara 4OS submersible motor. Representative manufacturer family photograph.
LOWARA 4OS 4" SUBMERSIBLE REPLACEMENT MOTORS
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.37 kw 0.5 HP 3 Wire Single Phase PULO0.37KW1PHLOW
$616.08 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.37 kw 0.5 HP 2 Wire Single Phase PULO0.37KW1PH2WIRE
$886.12 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.37 kw 0.5 HP – Three Phase PULO0.37KW3PHLOW
$644.37 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.55 kw 0.75 HP 3 Wire – Single Phase PULO0.5KW1PHLOW
$629.82 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.55 kw 0.75 HP 2 Wire – Single Phase PULO0.55KW1PH2WIRE
$947.56 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.55 kw 0.75 HP – Three Phase PULO0.5KW3PHLOW
$657.31 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.75 kw 1 HP 3 Wire – Single Phase PULO0.75KW1PHLOW
$637.91 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.75 kw 1 HP 2 Wire – Single Phase PULO0.75KW1PH2WIRE
$987.99 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 0.75 kw 1 HP – Three Phase PULO0.75KW3PHLOW
$675.10 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 1.1 kw 1.5 HP 3 Wire – Single Phase PULO1.1KW1PHLOW
$731.69 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 1.1 kw 1.5 HP 2 Wire – Single Phase PULO1.1KW1PH2WIRE
$1,112.50 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 1.1 kw 1.5 HP – Three Phase PULO1.1KW3PHLOW
$731.69 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 1.5 kw 2 HP 3 Wire – Single Phase PULO1.5KW1PHLOW
$832.76 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 1.5 kw 2 HP – Three Phase PULO1.5KW3PHLOW
$829.52 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 2.2 kw 3 HP 3 Wire – Single Phase PULO2.2KW1PHLOW
$1,129.47 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 3 kw 4 HP – Three Phase PULO3KW3PHLOW
$1,283.90 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 4 kw 5.5 HP – Three Phase PULO4KW3PHLOW
$1,692.19 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 5.5 kw 7.5 HP – Three Phase PULO5.5KW3PHLOW
$2,170.82 /each
Lowara 4OS submersible motor. Representative manufacturer family photograph.
Lowara Submersible 4" Motor Only 7.5 kw 10 HP – Three Phase PULO7.5KW3PHLOW
$2,595.29 /each

Lowara 4OS replacement motors drive Lowara GS and other compatible 4-inch bore-pump ends for water supply and irrigation. They can replace a failed motor while retaining a serviceable pump section. Versions are available for single-phase and three-phase installations.

For compatible Lowara GS and other 4-inch NEMA bore-pump ends.

The corresponding Lowara ranges are Lowara 1GS, Lowara 2GS, Lowara 4GS, Lowara 6GS, Lowara 8GS, Lowara 12GS, Lowara 16GS. Select the motor power and electrical version for the particular pump.

Two-wire single-phase motors have starting equipment and motor protection built in. Three-wire single-phase motors require a matching external starter/control box. Three-phase motors require suitable starting equipment and overload protection.

The motor lead is included. The pump end, external control panel and cable jointing kit are not included. Extend the lead with correctly sized submersible cable and a waterproof joint suited to the installation.

Keep the motor submerged and provide water flow around its exterior for cooling. The standard water-temperature limit is 35°C with adequate cooling flow. A cooling sleeve may be needed in a wide bore or tank. Maximum motor submergence is 150m below the water surface. Do not run dry.

The oil-filled motor has windings that can be rewound during repair. It has a stainless-steel outer sleeve and a mechanical seal protected by a sand guard.

Replacement considerations

The standard NEMA connection allows cross-brand replacement where the pump and motor are correctly matched. Your installer needs to confirm that the motor can drive the pump and that the coupling, controls and installation suit the replacement. A higher motor rating does not by itself increase pump flow or pressure.

If the installation uses a variable-speed controller, confirm the motor version before ordering. The 4OS installation manual specifies a specially ordered motor for frequency-converter operation.

Two-year warranty, subject to the applicable Australian Lowara supply terms and consumer rights.

Lowara 4OS Motor Technical Data
Lowara 4OS Installation: three-wire single-phase and three-phase motors

✓ Application
Replacement motor for compatible submersible bore-pump ends. Pump end is separate.

✓ Warranty
Two-year warranty, subject to the applicable Australian Lowara supply terms and consumer rights.

✓ Pump Compatibility
For compatible Lowara GS and other 4-inch NEMA bore-pump ends.
Lowara pump-end models by motor output:
0.37kW: 1GS03, 2GS03, 4GS03.
0.55kW: 1GS05, 2GS05, 4GS05, 6GS05.
0.75kW: 1GS07, 2GS07, 4GS07, 6GS07, 8GS07.
1.1kW: 1GS11, 2GS11, 4GS11, 6GS11, 8GS11, 12GS11.
1.5kW: 1GS15, 2GS15, 4GS15, 6GS15, 8GS15, 12GS15, 16GS15.
2.2kW: 2GS22, 4GS22, 6GS22, 8GS22, 12GS22, 16GS22.
3kW: 2GS30, 4GS30, 6GS30, 8GS30, 12GS30, 16GS30.
4kW: 4GS40, 6GS40, 6GS40R, 8GS40, 12GS40, 16GS40.
5.5kW: 6GS55, 6GS55R, 8GS55, 8GS55R, 12GS55R, 16GS55, 16GS55R.
7.5kW: 8GS75, 8GS75R, 12GS75.
Motor output must cover the pump's maximum required shaft power over its intended operating range.
Confirm shaft and mounting fit, coupling clearance, rotation and bearing load before assembly.
Axial thrust capacity: 3000N for 0.37-2.2kW. 6500N for 3-7.5kW.

✓ Starting & Motor Protection
Two-wire single-phase motors have starting equipment and motor protection built in. Three-wire single-phase motors require a matching external starter/control box. Three-phase motors require suitable starting equipment and overload protection.

✓ Included Equipment
Motor lead included.
Pump end, external control panel and cable jointing kit not included.

✓ Construction
Oil-filled, rewindable motor.
Stainless-steel outer sleeve.
Mechanical seal protected by a sand guard.

✓ Motor & Electrical Supply
4OS03M/3W: P2 0.37kW. 220-240V single phase. Three wire. 50Hz. Current 3.2A at 240V.
4OS03M/2W: P2 0.37kW. 220-240V single phase. Two wire. 50Hz.
4OS03T/3W: P2 0.37kW. 380-415V three phase. 50Hz. Current 1.3A at 415V.
4OS05M/3W: P2 0.55kW. 220-240V single phase. Three wire. 50Hz. Current 4.3A at 240V.
4OS05M/2W: P2 0.55kW. 220-240V single phase. Two wire. 50Hz.
4OS05T/3W: P2 0.55kW. 380-415V three phase. 50Hz. Current 1.7A at 415V.
4OS07M/3W: P2 0.75kW. 220-240V single phase. Three wire. 50Hz. Current 5.6A at 240V.
4OS07M/2W: P2 0.75kW. 220-240V single phase. Two wire. 50Hz.
4OS07T/3W: P2 0.75kW. 380-415V three phase. 50Hz. Current 2.4A at 415V.
4OS11M/3W: P2 1.1kW. 220-240V single phase. Three wire. 50Hz. Current 7.6A at 240V.
4OS11M/2W: P2 1.1kW. 220-240V single phase. Two wire. 50Hz.
4OS11T/3W: P2 1.1kW. 380-415V three phase. 50Hz. Current 3.1A at 415V.
4OS15M/3W: P2 1.5kW. 220-240V single phase. Three wire. 50Hz. Current 10.5A at 240V.
4OS15T/3W: P2 1.5kW. 380-415V three phase. 50Hz. Current 4.4A at 415V.
4OS22M/3W: P2 2.2kW. 220-240V single phase. Three wire. 50Hz. Current 14.4A at 240V.
4OS30T/3W: P2 3kW. 380-415V three phase. 50Hz. Current 7.1A at 415V.
4OS40T/3W: P2 4kW. 380-415V three phase. 50Hz. Current 9.8A at 415V.
4OS55T/3W: P2 5.5kW. 380-415V three phase. 50Hz. Current 13.7A at 415V.
4OS75T/3W: P2 7.5kW. 380-415V three phase. 50Hz. Current 18.7A at 415V.

✓ Motor & Electrical Notes
Frequency: 50Hz. Enclosure: IP68. Insulation: Class F.
Protection settings and cable selection must match the selected motor nameplate.

✓ Cooling & Installation
Maximum standard water temperature: 35°C with at least 0.08m/s flow past the motor.
Maximum motor submergence: 150m below the water surface.
Keep the motor submerged. Fit a cooling sleeve if cooling flow is inadequate.
Do not run dry. Support the assembly using suitable hardware, not its electrical cable.
For horizontal installation, follow both the motor and pump installation limits.

✓ Switching Limits
Maximum 30 starts per hour for direct starting (full supply voltage), evenly spaced.
Maximum 20 starts per hour for impedance starting (a resistor or reactor limits the starting current).

✓ Variable-Speed Controllers
Confirm the supplied motor version is approved for frequency-converter operation.
The specially ordered frequency-converter version requires a 10% motor-output reduction under the 4OS installation instructions.
Maintain the required cooling flow at the lowest operating speed. Follow the motor and controller instructions.

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