Side-Power SE40/125S, 12V, Single Prop 88 lbs of Thrust

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Side-Power SE40/125S Thruster (Sealed Gearleg), 125mm, 12V

The SE40 thruster gets every ounce of power you could want out of a 5" tunnel thruster. Side-Power's proprietary IPC system ensures safety and reliability while maintaining high thrust output and low-noise operation. Customize your thruster system with our wide range of controls, remotes and other add-ons.


Thrust @ 10.5VDC 88 lbs (40 kg)
Thrust @ 12VDC 105 lbs (48 kg)
Approx. Boat Size 26-34' (8-10.5 m)
Tunnel Diameter (I.D.) 4.92" (125 mm)
Power @ 10.5V 3 hp (2.2kw)
Recommended Fuse Size 250 Amps (SMANL250)
Fuse Size 250 Amp
Minimum Battery Capacity 570 CCA SAE
Approximate Ship Weight (lbs) 25

The gearhouse / drive legs of most Sleipner DC Electric thrusters are now fully galvanically isolated / separated from the electric motor and motor bracket. This ensures that even if there is an accidental short circuit or a current leak for other reasons, the immersed parts are not effected as they could be with direct electric contact.

  • Achieved by composite bushings around the bolts and beneath the washers and a bushing in the motor bracket electrically isolating the drive housing from the motor bracket.
  • Available on DC electric models with flexible couplers only, where the flexible coupler provides galvanic separation of the motor and gearleg shaft.
Side-Power Sealed Drive

Sealed drive lubrication

Sealed gearleg with long-life "mechanical" seal where highly polished ceramic and carbon surfaces form the only moving sealing surfaces, ensuring protection against damaging water intrusion into the gear leg. Pre-filled with special gear oil for lifetime lubrication.

  • "Mechanical" seals with surfaces of ceramic and carbon for ultimate security against water intrusion

Single propeller

A properly engineered single propeller system will be the most energy efficient thruster. Its compact design fits easily into narrow bows making it the perfect match for our smaller models. With more than 60.000 single propeller thrusters in use, the Sleipner single series system has proven its reliability.

Side-Power Q-prop™


The new 5 blade special skew propellers are the result of over 2 years of development work and thousands of tests. They have been designed to reduce the noise level, while maintaining the exceptional efficiency of the old 4 blade Sleipner propellers. This goal was achieved, and we even chose to make them a little bit more aggressive on some models, increasing the thrust on some thrusters about 5%. Please see individual information on each new thruster for more details.

  • Noise reductions of up to 75% measured in controlled environments
  • The expected and tested normal noise reduction in average installations: 20-40%
  • Will be delivered on all Sleipner models except models with 300 mm and 385 mm tunnel diameter
  • Upgrade kits are available for most SP series thrusters with special adaptors
Side-Power Intelligent Power Control

Intelligent power control

The Sleipner unique thruster controller that intelligently protects the thruster from potential inherent problems in all high current applications as well as user faults. It includes several important safety features imperative in a product with such high power, run by DC electrics, as a thruster.

  • Provides delay between drive directions
  • Monitors solenoid functions to reduce the chance of solenoid lock-in
  • Will stop the thruster in case of a lockedin solenoid, without extra user action and even without controlling a main switch.

Measurements Value
(H) Height 263mm / 10.35in
(L) Length 183mm / 7.2in
(W) Width 206mm / 8.11in
(ID) Internal Diameter 125mm / 4.92in
(WD) Water Depth 125mm / 4.92in
(TL) Recommended Tunnel Length 136mm / 5.35in
(TL min.) Minimum Tunnel Length 111mm / 4.37in
(T min.) Minimum Tunnel Wall Thickness 4mm / 0.16in
(T max.) Maximum Tunnel Wall Thickness 6mm / 0.24in

Stern Measurements Value
(L) Internal Length 228mm / 8.98in
(+L) Tunnel Length 188mm / 7.4in
(WD) Stern Water Depth 125mm / 4.92in
(HT) Maximum Hull Thickness 17mm / 0.57in