GRUNDFOS SP submersible pumps are designed specifically for borehole supply applications. They are of multistage centrifugal impeller design and all parts are made from stainless steel with water lubricated rubber bearings. A submersible motor is fitted beneath the pump and suction is effected through a strainer between the pump and motor.

Standard pumps are designed for the pumping of non-aggressive water. 'N and R' versions are available for applications requiring a higher degree of corrosion resistance.

All SP pumps carry a drinking water approval and meet European Minimum Efficiency Index guidelines

The pump is coupled to a sealed, liquid cooled 2-pole asynchronous GRUNDFOS motor constructed of stainless steel with ceramic bearings. All motors are also fitted with a built-in sensor which monitors running temperatures. When fitted with the patented GRUNDFOS MP 204 control unit protection is provided against dry running, mechanical motor defects, excessive motor running temperature and irregular power supply. The fitting of MP204unit is recommended for motor control and monitoring and also extended motor life.

Note that irrespective of the fitting of MP 204 control unit a remote starter is required. Due to the low starting torques of submersible motors it is recommended that Direct-on-Line starters are used on motor sizes up to 22kW. Motors above this size should use a soft start arrangement.

Enclosure Class: IP58
Insulation Class: F
Voltage: 3x415 V
Speed: 2900rpm


Pumped Liquid: Thin, clean chemically non-aggressive liquids without solid particles or fibres.
Max. Liquid Temperature: +400C
Max. Water Depth: 600m
Min. Borehole Diameter: 200mm - MS6/MMS6000 254mm - MMS8000


Model Motor Full Load Current (A) Istart / I Motor Dimensions (mm) Weight (kg)
kW HP A B C D E*
SP 125-3 30 40 63 4.9 MMS6000 1907 944 963 139.5 211 123
SP 125-4 37 50 85 5.1 MMS6000 2431 1312 1119 143 211 171
SP 125-6-A 55 73 112 5.9 MMS8000 2781 1350 1431 192 218 257
SP 125-8 75 100 152 5.4 MMS8000 3333 1590 1743 192 218 314
SP 125-10 92 123 186 5.6 MMS8000 3885 1830 2055 192 218 372

E*=Maximum diameter of the pump inclusive of cable guard and motor