12″ · KM12

Submersible motors · 12″ borehole

KOMAX KM12 Series:12” Submersible Water-Cooled Motor

The most powerful motor in the KOMAX range, built for 12-inch municipal and industrial boreholes. 4-pole torque from 100 to 300 HP to drive the largest FX mixed-flow pumps.

Power range: 100 HP (75 kW) – 300 HP (223 kW)4-pole · high torque
Speed: 4-pole1,450 rpm @ 50 Hz · 1,750 @ 60 Hz
Voltage: 380–415 V50 Hz · or 460 V @ 60 Hz
Mounting: Double flangeNEMA coupling
Thrust load: 120,000 NKingsbury type
Immersion: 200 mMax. depth · IP68

ConstructionStandard · Cast iron with NSF Certified EpoxyOptional · SS316 & SS2205 (Duplex Steel)

Request a quote Datasheet & catalog Find your model

IEC 60034-1NSF/ANSI/CAN 61CEPSQCA

Construction

What’s inside, part by part.

Taken from the cross-section in the catalog. Each detail exists to keep sand out, heat down and the shaft true.

01 · SEALING

Triple seal stack

A sand guard, back-to-back NBR lip seals and a spring-loaded tungsten-carbide mechanical seal. The sand guard stays intact at 3,500 rpm.

02 · CABLE ENTRY

Independent cable seal

A rubber gasket sandwiched between nylon plates and clamped by a steel plate on M8 bolts. The lead exits the lower flange to avoid damage during assembly.

03 · FILLING

Slanted fill holes

Positioned for maximum fluid level inside the motor, and easy to reach even with the pump coupled.

04 · STATOR

M800 low-loss stack

A longer stack of high-grade silicon steel gives lower core losses, lower current and a cooler-running motor. The ends are welded to threaded flanges.

05 · WINDING

BOPET+BOPP copper

Electrolytic solid copper rated above 100 °C, with an oversized gauge and mechanised coil insertion.

06 · ROTOR & SHAFT

AISI 431 spline shaft

Induction-hardened to 40 HRC and ground along its full length, with copper-bar rotor slots. Standard coupling dimensions.

07 · BEARINGS

Double carbon bushes

Water-lubricated guide bearings in both brackets. A tapered balancing ring guides flow into the bushes for cooling.

08 · THRUST

Kingsbury thrust bearing

A carbon disc on hardened 400-series stainless shoes. Custom thrust ratings are available on request.

09 · PROTECTION

PT100 provision & NBR bellow

A PT100 port for real-time temperature monitoring. The NBR bellow compensates for heat expansion and depth pressure.

IP68Protection

A / BInsulation class

50 °CAmbient water

+6/−10%Voltage tolerance

Vert./Horiz.Mounting

16 cm/sMin. cooling flow

200 mMax. immersion

10Max. starts / hour

Rotation CCW facing shaft end · Water + non-toxic antifreeze filler · Wooden case packing.

Model selector

Pick the power. Get the full data sheet.

Choose your grid frequency and rating to see current, efficiency, power factor, dimensions, weight and recommended cable for that exact model.

KM12 200-4

Service factor —

Speed: —
Full-load current: —
SF current: —
Power factor: —
Thrust capacity: —
Weight: —
Cable · DOL: —
Cable · Star-delta: —

Efficiency · power factor at load

50 %—%—

75 %—%—

100 %—%—

Bars scaled 70–90 % for readability. cos φ shown in grey.

Motor length (mm)

Packing — mm · — kg packed

Data from catalog KM-R0426. Specifications subject to change.Quote this model

Electrical data

Three-phase motor data for every rating.

Scroll sideways on small screens →

50 Hz · 380–415 V
	Motor size			Current (A)		Efficiency % at load			Power factor (cos φ) at load
Motor type	HP	kW	RPM	Full load	Safety	50	75	100	50	75	100	SF
KM12 100-4	100	75	1,435	148.4	—	85.0	88.0	87.7	0.66	0.77	0.83	1.00
KM12 125-4	125	93	1,430	178.4	—	86.3	88.4	87.9	0.71	0.81	0.86	1.00
KM12 150-4	150	112	1,425	212.4	—	86.4	88.5	87.7	0.74	0.83	0.87	1.00
KM12 175-4	175	130	1,430	252.4	—	86.4	88.4	88.0	0.68	0.79	0.85	1.00
KM12 200-4	200	150	1,425	288.2	—	86.4	88.9	88.4	0.69	0.80	0.85	1.00
KM12 225-4	225	168	1,415	314.3	—	86.5	88.4	87.8	0.79	0.85	0.88	1.00
KM12 250-4	250	186	1,420	351.6	—	86.6	88.3	87.7	0.77	0.85	0.87	1.00
KM12 270-4	270	201	—	—	—	—	—	—	—	—	—	—
KM12 300-4	300	223	—	—	—	—	—	—	—	—	—	—

60 Hz · 460 V
	Motor size			Current (A)		Efficiency % at load			Power factor (cos φ) at load
Motor type	HP	kW	RPM	Full load	Safety	50	75	100	50	75	100	SF
KM12 100-4	100	75	1,720	122.2	139.7	86.9	89.8	89.4	0.73	0.82	0.86	1.15
KM12 125-4	125	93	1,720	152.4	174.8	87.7	89.7	89.3	0.73	0.82	0.86	1.15
KM12 150-4	150	112	1,725	185.5	210.9	87.7	90.0	89.7	0.70	0.80	0.84	1.15
KM12 175-4	175	130	1,725	214.9	246.0	87.8	90.1	90.0	0.71	0.81	0.85	1.15
KM12 200-4	200	150	1,720	242.5	278.3	87.8	90.4	90.1	0.74	0.83	0.86	1.15
KM12 225-4	225	168	1,720	273.1	312.6	87.8	90.2	89.9	0.75	0.83	0.86	1.15
KM12 250-4	250	186	1,725	304.6	347.5	87.9	90.1	89.8	0.73	0.82	0.86	1.15
KM12 270-4	270	201	1,730	340.9	390.2	87.0	90.8	90.7	0.70	0.78	0.82	1.15
KM12 300-4	300	223	1,725	372.2	424.4	87.6	90.3	90.2	0.69	0.79	0.84	1.15

Values as published in catalog KM-R0426. Safety-factor current applies at 60 Hz (SF 1.15).

Construction options

Choose the metallurgy for your water.

Not sure which? Send us a water analysis with your enquiry and we’ll recommend one.

Standard

Cast iron, NSF-certified epoxy

The right choice for most fresh-water wells: agriculture, municipal supply and general industrial duty.

Brackets & housingsCast iron, NSF Certified Epoxy
ShaftAISI 431 stainless
Fasteners & flangesAISI 304/316
Drinking waterNSF/ANSI/CAN 61

Optional

SS316 & SS2205 (Duplex Steel)

For saline, brackish or chemically aggressive water, coastal installations and food or pharma process water.

Brackets & housingsSS316 or SS2205 duplex
ShaftAISI 431 / SS316
Fasteners & flangesSS316
Best forCorrosive / saline wells

Request a quote

Quote a KM12 for your project.

Pick the model, or just give us flow and head. An application engineer will reply with a selection, lead time and pricing, normally within one working day.

KOMAX KM12 Series:12” Submersible Water-Cooled Motor

Municipal-scale lifting, still rewindable.

Typical applications