Grundfos MS4000 4 in submersible motors in several horsepower sizes, with motor leads

Grundfos MS and MMS Submersible Motors

Grundfos MS and MMS submersible motors for 4 in and 6 in water wells, from 1/2 to 60 HP.
The MS402 and MS4000 cover 4 in wells in single-phase 2-wire, single-phase 3-wire and three-phase builds; Grundfos prices its 4 in motors with the motor lead.
The MS6000C covers 6 in wells from 5 to 40 HP, with a T60 high-temperature version for water to 140°F, and the rewindable MMS6 covers 50 and 60 HP.
All MS motors have a hermetically enclosed stainless steel stator, and Grundfos covers them for 24 months from installation, up to 30 months from manufacture.
Choose the motor by the pump end's horsepower and size, then the voltage and phase at the well; control boxes, leads and kits are matched on each motor page.
For engineering-led selection send the pump end model and well data to sales@watermainsupply.com or call 1-888.510.4036.

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Grundfos MS6000C and MMS6 6 in Submersible Motor
Grundfos MS6000C 6 in stainless steel submersible motor with lead connection

Grundfos

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Grundfos MS6000C and MMS6 6 in Submersible Motor

From $2,722.93
Grundfos MS402 and MS4000 4 in Submersible Motor
Grundfos MS402 4 in stainless steel submersible motor

Grundfos

Free Shipping $499 or more

Grundfos MS402 and MS4000 4 in Submersible Motor

From $657.96

Grundfos MS and MMS Submersible Motors

Grundfos · Submersible Motors

Grundfos MS and MMS
Submersible Motors

Grundfos 4 in and 6 in submersible motors for water wells, from a 1/2 HP domestic MS402 to the 60 HP rewindable MMS6. Single-phase 2-wire and 3-wire, three-phase, standard and 140°F high-temperature builds, each matched to the pump end, control box and lead it needs, with engineering-led selection on every order.

Grundfos MS6000C 6 in stainless steel submersible motor
1/2-60 HP4 in and 6 in motors
71Builds listed
6,070 lbMax thrust, MS6000C
140°FT60 Hi-Temp water
24 MonthsGrundfos warranty

Grundfos MS and MMS motors drive Grundfos SP pump ends and any pump end built for a standard 4 in or 6 in motor flange. The MS402 serves the domestic groundwater market; the MS4000 and MS6000C are built for water supply duty, with a high-temperature T60 version for hot wells; the MMS6 is Grundfos’s rewindable motor for heavy-duty and industrial wells. Every MS motor has a hermetically enclosed stainless steel stator and AISI 304 stainless steel on all surfaces in contact with water.

We supply the full 4 in and 6 in range from the Grundfos 2026 price list, together with the control boxes, motor leads, nut and bolt kits and MP 204 motor protectors that complete an installation. Send us the pump end, the voltage and the well data and we will confirm the motor, control and cooling before you order. Call 1-888.510.4036. Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.

Submersible Well Pump Sizing CalculatorFlow, total head and the horsepower to look forGrundfos SP and SPE Pump EndsThe pump ends these motors drive

Will a Grundfos Motor Work for Your Well?

The four questions drillers and owners ask first, answered from Grundfos’s published data.

24-Month Warranty

Covered for 24 months from the date of installation, but not more than 30 months from the date of manufacture, under Grundfos’s limited warranty in the SP/SPE installation and operating instructions. Three-phase motors need three-leg ambient-compensated quick-trip overloads, a recorded current-imbalance check and surge arresters to keep that warranty.

Built to Last

Hermetically enclosed stainless stator, so condensation cannot short the windings. Cooling chambers top and bottom circulate the motor liquid. The MS402 is insulated against lightning surges; the MS6000C runs a spring-loaded SiC/SiC seal with a sand shield; the MMS6 can be rewound.

The Fit Limits

4 in motors need a 4 in casing and 0.25 ft/s of water past the motor for 104°F water. 6 in motors need a 6 in casing: 0.50 ft/s past an MS6000C T40, 3.3 ft/s past a T60 at 140°F, 0.15 ft/s past an MMS6. Single-phase 3-wire needs a control box; three-phase needs a starter or drive.

Size It Now

Enter the pumping level, flow and pressure; the calculator returns the total head and the horsepower class to look for.

Run the Calculator

Or send the numbers: sales@watermainsupply.com · 1-888.510.4036

See Grundfos Motors and SP Pumps

Grundfos’s own videos: the SP pump and motor range, and the service procedure for the MS6000C motor.

Grundfos SP pumps and MS motors

How to repair the Grundfos MS6000C motor

Grundfos 4 in and 6 in Motors

Two listings cover the range. Pick the listing by well size and horsepower, then choose the HP, the voltage and phase, and the motor type in the selector.

Grundfos MS402 4 in stainless steel submersible motor

MS402 and MS4000 4 in

Domestic and water supply wells

1/2-10 HPHorsepower
34Builds
900 / 1,500 lbMax thrust
Lead includedPrice-list basis

The MS402 covers 1/2 to 2 HP in single-phase 2-wire, single-phase 3-wire and three-phase builds. The MS4000 takes over from 2 to 10 HP with 1,500 lb of thrust, a ceramic/carbon seal and, on the 7-1/2 and 10 HP, the Tempcon temperature transmitter.

  • 115V and 230V single-phase; 208V, 230V and 460V three-phase
  • Grundfos prices 4 in motors with the motor lead
  • Control box needed on single-phase 3-wire builds only
  • Factory-filled with SML-3 motor liquid, frost-proof to -4°F
Best forHomes, farms and small water systems on 4 in wells, and replacing a failed motor under an existing 4 in pump end.
View 4 in Motors
Grundfos MS6000C 6 in stainless steel submersible motor

MS6000C and MMS6 6 in

Water supply, irrigation and hot wells

5-60 HPHorsepower
37Builds
6,070 lbMax thrust, MS6000C
140°FT60 Hi-Temp

The MS6000C runs 5 to 40 HP in standard T40 and high-temperature T60 three-phase builds, and 5 to 15 HP single-phase. The MMS6 covers 50 and 60 HP with cast-iron or 316 stainless steel end-bells and windings that can be rewound.

  • 208-230V and 440-460V three-phase; 208-230V single-phase 3-wire
  • Single-phase builds take an XL Deluxe control box with magnetic starter
  • SiC/SiC shaft seal on both series
  • MS6000C lead 96164249 listed as a separate part
Best forCommunity and irrigation wells, industrial water supply, hot wells to 140°F and heavy-duty wells where a rewindable motor pays back.
View 6 in Motors

Inside the 6 in Listing

Grundfos MMS6 6 in rewindable submersible motor

MMS6 Rewindable

50 and 60 HP · 460V 3Ph · cast iron or 316 SSHeavy-duty wells Grundfos MS4000 4 in submersible motors in several horsepower sizes

MS4000

2 to 10 HP · 1,500 lb thrust · 1Ph 3-wire and 3PhWater supply duty

Grundfos Motor Series Compared

Four motor series, one standard each for 4 in and 6 in pump ends. The series is decided by horsepower and duty; the voltage and phase by the power at the well.

Specification MS402 MS4000 MS6000C MMS6
Size 4 in 4 in 6 in 6 in
Horsepower 1/2-2 HP 2-10 HP 5-40 HP 50-60 HP
Power 1Ph 2-wire and 3-wire; 3Ph 208V, 230V, 460V 1Ph 3-wire; 3Ph 208-230V and 440-460V 1Ph 3-wire 208-230V; 3Ph 208-230V and 440-460V 3Ph 460V
Max thrust 900 lb 1,500 lb 6,070 lb 6,180 lb
Shaft seal Lip seal, drinking-water approved Ceramic/carbon SiC/SiC with sand shield SiC/SiC, replaceable
Max water temperature 104°F (40°C) 104°F (40°C) 104°F T40; 140°F T60 86°F (30°C) per booklet
Cooling flow past motor 0.25 ft/s 0.25 ft/s 0.50 ft/s T40; 3.3 ft/s T60 0.15 ft/s
Motor lead Included (price-list basis) Included (price-list basis) Separate part 96164249 Confirm at order
Quick rule. Up to 2 HP in a 4 in well, the MS402 (the 2 HP single-phase 3-wire is an MS4000). From 3 to 10 HP, the MS4000; 10 HP is three-phase only. In a 6 in well from 5 HP, the MS6000C, choosing the T60 when the water runs above 104°F. At 50 and 60 HP, the MMS6.

Grundfos vs DAB and A.Y. McDonald Motors

We sell every line below, so we can be straight about fit. Specifications are taken from our own product pages for each brand.

4 in submersible motors

Specification Grundfos MS402 / MS4000 DAB Tesla 4GG / 4TW A.Y. McDonald 4 in Motor
Horsepower 1/2-10 HP 0.5-10 HP (4GG); 0.5-1.5 HP (4TW) 1/2-10 HP
2-wire single-phase 1/2-1-1/2 HP, no control box 4TW 0.5-1.5 HP, capacitor in the motor 1/2-1-1/2 HP
3-wire single-phase 1/2-5 HP, control box required 4GG 0.5-5 HP, control box required 1/2-5 HP, control box required
Three-phase voltages 208V, 230V, 460V (208-230V and 440-460V on MS4000) 230V and 460V 230V, 460V and 575V
Construction AISI 304 stainless; hermetically enclosed stator AISI 304 stainless; canned stator Stainless steel
Stated extras Up to 1,500 lb thrust; Tempcon on 7-1/2 and 10 HP VFD ready 30-60 Hz; 984 ft max depth; NSF 61/372, UL, CSA 575V three-phase builds

Verdict. The MS4000 carries the higher stated thrust, 1,500 lb, and Grundfos prices its 4 in motors with the lead. DAB Tesla states VFD operation from 30 to 60 Hz and NSF/ANSI 61 and 372, UL and CSA listings on its product page. A.Y. McDonald is the one to choose for 575V three-phase service.

6 in submersible motors

Specification Grundfos MS6000C / MMS6 DAB Tesla 6GF A.Y. McDonald 6 in (3Ph and 1Ph)
Horsepower 5-60 HP 5.5-60 HP 5-60 HP (3Ph); 7-1/2-15 HP (1Ph)
Single-phase 5-15 HP, 208-230V 7.5-15 HP, 230V 7-1/2-15 HP, 230V
Three-phase voltages 208-230V, 440-460V; 460V on MMS6 230V and 460V 230V, 460V and 575V
Hot water T60 version to 140°F Not stated Not stated
Construction 304 SS (MS6000C); cast iron or 316 SS end-bells (MMS6) AISI 304 stainless and cast iron Not stated on our page
Stated extras 6,070 lb thrust; SiC/SiC seal; rewindable MMS6 Heavy-duty thrust bearing 30-60 HP; VFD ready; Pt100 option 575V builds; 7, 8 and 10 in motors on sister listings

Verdict. Grundfos is the line for hot water, with the T60 rated to 140°F, and for a rewindable motor at 50 and 60 HP. DAB Tesla 6GF states VFD operation and a heavy-duty thrust bearing from 30 HP. A.Y. McDonald covers 575V service and goes beyond 6 in, with 7, 8 and 10 in motors.

Which Grundfos Motor Do You Need?

Start from the pump end. Its horsepower and motor size set the motor; the power at the well sets the build.

Situation Motor Build to choose Notes
Replacing a failed 4 in motor, 1/2-1-1/2 HP, two wires to the well MS402 2-wire 115V or 230V 1Ph 2-Wire No control box; check the pressure switch and wiring are for a 2-wire motor.
4 in well, single-phase power, 2-5 HP MS4000 3-wire 230V 1Ph 3-Wire Standard or Deluxe control box by HP, listed in the motor page table.
4 in well, three-phase power MS402 or MS4000 208V, 230V or 460V 3Ph Magnetic starter or drive with three-leg quick-trip overloads.
6 in well, single-phase power, 5-15 HP MS6000C 208-230V 1Ph 3-Wire XL Deluxe control box with magnetic starter: 99053535 to 99053538 by HP.
6 in well, water above 104°F MS6000C T60 208-230V or 440-460V 3Ph Needs 3.3 ft/s past the motor at 140°F; fit a flow sleeve where the well cannot give it.
50 or 60 HP in a 6 in well MMS6 460V 3Ph Cast iron or 316 SS end-bells; confirm the lead with us at order.

Matching a Motor to the Pump End

A submersible motor is chosen after the pump end. These are the checks we run on every order.

1. Horsepower and size. The pump end’s model code sets the horsepower and motor size. A Grundfos 35S50-15, for example, is a 5 HP pump end; on a 4 in motor it takes the MS4000 5 HP.

2. Thrust. The motor must carry the pump end’s down-thrust: 900 lb on the MS402, 1,500 lb on the MS4000, 6,070 lb on the MS6000C, 6,180 lb on the MMS6.

3. Power and control. Match the nameplate voltage and phase to the supply. Single-phase 3-wire motors need the matching control box; three-phase motors need a starter or drive with three-leg ambient-compensated quick-trip overloads and surge arresters.

4. Cooling. Water must flow past the motor at the Grundfos minimum for its type, or the motor needs a flow sleeve. Hot water calls for the T60.

Worked example. A 6 in irrigation well on 460V three-phase, pump end 160S150-6 at 15 HP, water at 75°F. Motor: MS6000C T40 15 HP 440-460V, part 96166164. Starter: three-phase magnetic starter or drive with quick-trip overloads. Cooling: 0.50 ft/s past the motor in a 6 in casing; in a larger casing, a flow sleeve.

Not sure of the pump end? Run the Submersible Calculator for the total head and horsepower class, or browse the Grundfos SP and SPE pump ends.

What Makes Grundfos Motors Last

From the Grundfos SP 60 Hz data booklet.

Enclosed Stator

The stator winding is hermetically enclosed in stainless steel, which gives mechanical stability, efficient cooling and no short-circuit from condensation.

Cooling Chambers

Chambers at the top and bottom of the motor and internal circulation of the motor liquid keep the windings cool while the flow past the motor is maintained.

Lightning Protection

The smallest motors, such as the MS402, are insulated to minimize the risk of burnout from a lightning strike.

SiC/SiC Seal

The MS6000C seal is spring-loaded, with a large surface and a sand shield, for minimum exchange of motor and pumped liquids and no penetration of particles.

Temperature Monitoring

Tempcon on the 7-1/2 and 10 HP MS4000; Pt100 or Pt1000 sensors for the MS and MMS ranges, read through an MP 204 motor protector.

Rewindable MMS

MMS windings are pure electrolytic copper with a non-hygroscopic thermoplastic sheath, cooled by direct contact with the motor liquid, and can be rewound.

Motor Accessories

The parts a motor needs to run and to stay protected, matched by part number on the motor pages.

Grundfos SA-SPM6 3-wire control box

3-Wire Control Box

Standard and Deluxe, 1/2 to 15 HP, for single-phase 3-wire motors

 Grundfos MS submersible motor lead

Motor Leads

MS402, MS4000 and MS6000C leads, 48 to 198 in

 Grundfos SP motor nut and bolt kits

Nut and Bolt Kits

Pump-to-motor kits for 4 in, MS6000C and MMS6 motors

 Grundfos MP 204 motor protector

MP 204 Motor Protector

Motor protection and temperature readout

Genuine Grundfos parts, factory-new in original packaging.

Why Buy Grundfos Motors from Watermain Supply

Engineering-Led Selection

Send the pumping level, flow, pressure and power. We check the pump end and motor against Grundfos’s published curves and electrical data before you order, and a factory submittal is available on request.

Multi-Brand Honesty

We also sell A.Y. McDonald, DAB and Franklin Electric submersibles. If a Grundfos build is not the right fit for the well, we will say so and quote the one that is.

Account Terms Available

Net-30 for qualified contractor, drilling, municipal and industrial accounts. PO and credit applications handled in-house.

Parts and Aftermarket

Control boxes, motor leads, nut and bolt kits and MP 204 motor protectors are listed alongside, matched by part number.

Complete Installations

Motor, control box, lead, nut and bolt kit and motor protector, on one order, matched by part number to the pump end.

Houston and the Gulf Coast

Based in Houston, Texas, serving drillers, irrigation districts and industrial plants across the Gulf Coast and nationwide.

Frequently Asked Questions

Common questions from drillers, pump installers and well owners choosing a Grundfos motor.

What warranty comes with a Grundfos submersible motor?

Grundfos covers its products for 24 months from the date of installation, but not more than 30 months from the date of manufacture, to the original user, under the limited warranty printed in the SP/SPE installation and operating instructions. On three-phase motors the warranty requires three-leg ambient-compensated quick-trip overloads, a recorded current-imbalance check and surge arresters, and no phase converter.

Does a Grundfos 4 in motor come with a lead?

Grundfos prices its 4 in MS402 and MS4000 motors as motor and motor lead. The MS6000C lead (96164249, 198 in) is a separate part, and we confirm the MMS6 lead at order.

Do I need a control box?

Only for single-phase 3-wire motors. Two-wire MS402 motors need none, and three-phase motors take a starter or drive instead. The control box for each horsepower is listed on the motor page; Grundfos sells the 1/2, 3/4 and 1 HP boxes in 10-packs.

What is the difference between the MS6000C T40 and T60?

The T40 is the standard motor for water up to 104°F with 0.50 ft/s of flow past it. The T60 high-temperature version runs in water up to 140°F with 3.3 ft/s of flow past the motor.

Will a Grundfos motor fit my existing pump end?

Grundfos MS motors fit Grundfos SP pump ends of the same size and horsepower. For another brand of pump end, send us its model and we will check the motor size and flange before you order.

How much flow past the motor does it need?

Grundfos lists 0.25 ft/s for the MS402 and MS4000, 0.50 ft/s for the MS6000C T40, 3.3 ft/s for the T60 at 140°F and 0.15 ft/s for the MMS6. Where the well cannot give it, fit a flow sleeve.

Can I run a Grundfos three-phase motor on single-phase power?

For single-phase service choose a single-phase build, available to 5 HP in 4 in and to 15 HP in 6 in. The Grundfos three-phase warranty calls for true three-phase power, without a phase converter.

Which motor has the most thrust?

In 4 in, the MS4000 at 1,500 lb. In 6 in, the MMS6 at 6,180 lb and the MS6000C at 6,070 lb.

How do Grundfos motors compare with DAB Tesla and A.Y. McDonald?

Grundfos leads on 4 in thrust, hot-water T60 builds and the rewindable MMS6. DAB Tesla states VFD operation from 30 to 60 Hz. A.Y. McDonald covers 575V service and motors from 7 to 10 in.

Ready to Match Your Motor?

Send the pump end model, the well size, the voltage and phase at the well, and the water temperature. We will reply with the motor, control and accessories that complete the installation.

1-888.510.4036 Run the Submersible Calculator Email sales@watermainsupply.com Request a Quote
Technical data on this page is taken from Grundfos product literature (2026 US groundwater price list, SP 60 Hz data booklet, SP/SPE installation and operating instructions and Grundfos Product Center) and is subject to change by the manufacturer. Confirm against the current installation manual before specifying.
Grundfos, MS402, MS4000, MS6000C, MMS6, SP, Tempcon and MP 204 are trademarks of Grundfos Holding A/S; DAB and Tesla are trademarks of DAB Pumps S.p.A.; A.Y. McDonald is a trademark of A.Y. McDonald Mfg. Co. All are used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.