SE25 Tunnel thruster, 12V

SE25 Tunnel thruster, 12V
25kg thrust ON/OFF

The world’s leading series of bow and stern thrusters for leisure boats are the SE series from Side-Power. Side-Power offers the world’s largest range of DC thruster systems for leisure boats. 

All the approved features and well-known quality boat builders around the world value, are now available for even smaller vessels.

With the new SE25, we add yet another tunnel diameter to our extensive program. With a tunnel diameter of only 110mm, the SE25 is suitable for vessels up to 24 feet depending of the vessels windage area. As with all the other thruster models in the SE series, the SE 25 also offers tremendous installation flexibility, as the thruster can be installed upon the tunnel in any angle and the thruster motor can be rotated on the motor bracket in 90 degrees steps. 

The SE25 are galvanic insulated as the larger thrusters in the SE series and features Side-Powers patented IPC technology for intelligent power control and safety. 

The SE25 is only available for bow installation.

Side-Power Intelligent Power Control

Intelligent Power Control

The Side Power 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.

Side-Power Single Propeller

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 Sidepower single series system has proven its reliability.


Side-Power Sealed Drive

Sealed and lifetime lubricated gearleg

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

Side-Power Galvanic Separation

Galvanic Separation

The gearhouse / drive legs of most Side-Power 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 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 Side-Power 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 Side-Power models except models with 300 mm and 385 mm tunnel diameter
  • Upgrade kits are available for most SP series thrusters with special adaptors
Thrust at 10.5/21V* (kg • lbs) 25 • 55
Thrust at 12/24V* (kg • lbs) 30 • 66
Typical boat size (ft • m) > 24' • > 7.3
Tunnel I.D. (mm • in) 110 • 4.33"
Propulsion Single
Power at 10.5/21V* (kW • hp) 1.5 • 2
For DC system (V) 12
Weight (kg • lbs) 9.5 • 21
Min. Batt. Capacity (CCA** 12/24V) 200/380
Control system Analog

* All Side-Power thrusters gets their thrust rating from the actual performance you can expect in a boat - at the voltage a normal installation will provide at the thruster. We have choosen to use the net performance at 10.5V/21V, but we also list the effect at 12/24V for comparison.

** All battery CCA ratings are stated with the DIN rating, multiply by 1.9 to to get the SAE equivalent (at 0°F, ABYC standard)

# Description Product
1 Propeller SM-125960
2 Propeller washer 208125
3 Locknut 3 1250
4 Anode 3 1180 A
5 Gasket 3 1310 10
6 Gearleg bolt 110033
7 Complete gearleg 2 0600
8 Complete motor bracket SM-126302
9 Complete flexible coupling SM-128472
10 Brushes for motor (kit)** **
11 Brush springs for motor (kit)** **
12 Electric motor N/A
13 Key for eletric motor shaft 112032
14 Solenoid bracket kit 2 0135
15 Electronic control box 6 1232 I
16 Internal wiring loom 6 1200 B
17 Solenoid 41571123
18 Complete solenoid kit 2 0131 12
19 Solenoid Cover 3 2024
20 Nut for solenoid cover 6 8810
21 Complete electric motor assembly 2 0105 12
22 Temp switch* *

The installer alone has responsibility for the installation of the spare parts. Side-Power only warranty the spare parts supplied only.

The information given in the document was correct at the time it was published. However, Sleipner Motor AS can not accept liability for any inaccuracies or omissions it may contain. Continuous product improvement may change the product specifications without notice. Therefore, Sleipner Motor AS can not accept liability for any possible differences between product and document.

File Type Language Download
Manual SE25.pdf Manual English, Norwegian  Download
Product specification sheet SE25 EN.pdf Product sheet English  Download
(INSTALLATION MANUAL) (SE) (20, 25, 30, 40).pdf Manual English, Norwegian  Download
(USER MANUAL) (SE & SE-IP).pdf Manual English  Download
CAD-files & technical drawings

3D models & technical drawings
for industry professionals

At Sleipner, we have shared our knowledge and technology with naval architects and boat builders for over a century. Now, we have also decided to open up our complete library of .cad, .igs, .dwg, .dxf, .stp, .xt, .pdf files and more.

Get access to 1000+ CAD files
Code Description Value (mm) Value (inch)
ID Internal tunnel diameter 110 4.33
H Motor Height 252 9.92
W Width 198 7.8
L Length 183 7.2
WD Water Depth 110 4.33
TL Minimum tunnel length 111 4.37
TL (recommended) Recommended tunnel lenght 133 5.24
T (min) Minimum tunnel wall thickness 4 0.16
T (max) Maximum tunnel wall thickness 6 0.24