Thruster, SEP40/125S-1IP Side Power 12V/3HP

SEP40 Tunnel thruster, 12V-IP

40kg thrust Proportional -IP

With its outstanding performance, excellent energy efficiency and very compact installation size, the SEP40 includes all the important and unique Side-Power features and qualities – why settle for less.

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Side-Power General Features:

  • Built for outstanding performance, you can rely on your Side-Power bow thruster or stern thruster year after year
  • Boat builders all over the world are choosing Side-Power for reliability, ease of installation and unrivalled safety features
  • This commitment to quality has made the new range of Side-Power thrusters manufactured by Sleipner Motor the market leader
  • Performance
    • The high performance of a Side-Power thruster is a result of their continuous efforts in product development and testing. propulsion technology know-how 5 bladed composite propellers purpose-built high power electric motors improved water flow from streamlined gearhouse design
  • Safety:

    • Side-Power thrusters include several features to ensure the safety of your boat and its passengers
    • These features protect against technical and operator errors
    • No overheating of electric motor
    • Mechanical protection of drive gear
    • Electronic protection against sudden change of drive direction
    • No accidental operation from child safe on/off and automatic deactivation
    • IPC comes standard on all DC electric thrusters hence reducing solenoid wear and the risk of lock in
  • Reliability:

    • The quality of a Side-Power thruster is always one step ahead
    • In house manufacturing and assembly
    • Engineering through experience
    • Use of superior materials
    • Controlled quality of every supplied part
    • 2-Year limited warranty
  • Installation

    • Through their extensive experience and close co-operation with major boat builders we know how important a correct installation is for the thruster system
    • Therefore they have made all the preparations to ensure that it is easy to install a Side-Power correctly
    • Compact-sized units
    • “Plug and Go” Electric wiring
    • Easily accessible battery cable terminals
    • Fast and safe propeller mounting with locknut
    • Professional and solid GRP stern thruster kits
    • Easy access zinc anodes

The Speed Controlled Thrusters ( SEP Series ) Features:

  • The SEP series are basically SE thrusters with the addition of the DC Power control system
  • Providing even more accurate control by fully regulating the power of the thruster as well as providing even longer run times, this is the latest in DC electric thrusters
  • The noise reduction and automatic “Hold” function are further benefits provided by the SEP series
  • Powerful single speed thrusters can, in light weather conditions, be a bit difficult to use as they push the boat too fast
  • The solution is to fit the new Sidepower DC Power Controller which enables proportional speed control of a DC electric thruster
  • By also controlling the thruster’s power, you get even more precise handling of the boat in all conditions
  • Another great advantage is that when you run the thruster at less than full power, the usable run time is extended, with close to continuous usage being possible when you are running the thruster at less than 50% of full power (percentage of thrust with continuous duty depending on thruster model)


Thrust at 10,5/21V* (kg)


Thrust at 12/24V* (kg)


Typical boat size (ft • m)

26’ – 34’ • 8 – 10.5

Tunnel I.D (mm)




Power at 10,5/21V* (kW • Hp)

2.2 • 3

For DC system (V)


Weight (kg • lbs)

11 • 24

Min. battery capacity (CCA**12/24V)


Control system


* 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 0ºF, ABYC standard)

Measurements Tunnel Thruster:

Measurements Tunnel Thruster, Side Power

A (mm · in) 125 · 4,96
B (mm · in) 245 · 9.6
C (mm · in) 226 · 8.9
D (mm · in) 230 · 9.1
E min (mm · in) 125 · 4.9
F (mm · in) 92 · 3.60
F recommended (mm · in) 184 · 7.25
G min. (mm · in) 4 · 0.16
G max. (mm · in) 5 · 0.20   


Measurements Stern Thruster (Stern tunnel kit sold separately)

Measurements Stern Thruster, Side Power

I (mm · in) 220 · 8.66
II (mm · in) 190 · 7.48
III min. (mm · in) 135 · 5.31
IV max. (mm · in) 14 · 0.55
V (mm · in) 160  · 6,3
VI (mm · in) 217 · 8,5
Tunnel length (mm · in) 197  · 7,76
Marine Thruster 3 HP Side Power Speed Control Ignition SEP40/125S-1IP 12V
Weight 50 lbs
Dimensions 28 × 18 × 18 in

Horse Powers (Model)

Typical boat size

Tunnel inner diameter


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