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Discontinued thruster
Sleipner SEP300/300TC (discontinued): specs, manual and parts
The Sleipner SEP300/300TC is a tunnel thruster. The motor sits inside the boat and turns a propeller in a tube through the hull. Sleipner has discontinued it. Its own product page said so when we read it on 11 October 2026.
This page stays up for the owners still running one. It holds the published figures, the part numbers and the manual. You will not find the unit in the thruster finder, the tool here that matches a unit to your boat, or on the compare page. If you need a new thruster, start with either of those.
The published figures
| Type | Tunnel, fixed mount |
|---|---|
| Thrust | 750 lb (340 kgf) |
| As the maker printed it | Thrust at 48V: 340kg / 750lbs; Thrust at 42V: 300kg / 661lbs |
| Voltage | 48 V |
| Motor | 15 kW |
| Tunnel diameter | 300 mm |
| Maker’s boat length | 72 to 98 ft |
| Part number | SEP300/300TC48V |
| Last price we read | No price held |
| Manual | Sleipner’s manual for it |
Service parts
These are Sleipner’s own part numbers for the parts an owner replaces, where we could find them: the pin that drives the propeller, the propeller, the anode, the brushes, the switch gear, the fuse and the motor. We read them on 11 October 2026. The last column says how we know each one fits this model. Give the dealer your thruster’s serial number from its label when you order.
| Part | Part number | Sleipner’s name for it | How we know it fits |
|---|---|---|---|
| Motor brush kit | BRUSH-11K | Brush kit SE300/SP285 48V | By the part’s name only. Confirm with your serial number.Sleipner asks for the thruster’s serial number with every brush kit order. |
| Solenoid (the motor switch) | 1013702 | Solenoid SE150/170/210/250/300 | Sleipner’s parts page lists this model |
| Main fuse | ANL 325 | Recommended fuse A | Sleipner’s page for this modelThe rating on Sleipner’s page for this model. The fuse holder is SMANLHOLD. |
| Replacement motor | 20 0103 48 | SEP300/SP285 48V | Sleipner’s parts page lists this model |
What the manual and listings say
PRO means proportional: the joystick sets how hard it pushes. This is the 48 V SEP300, with twin propellers in a 300 mm tunnel, for boats of about 72 to 98 ft. Sleipner rates it 340 kg (750 lb) at 48 V and 300 kg (661 lb) at 42 V. Sleipner's own page names the E300 eVision as its replacement.
Replacement and close alternatives
The replacement: Sleipner E300 eVision. Sleipner’s own page for this model links it as the replacement.
These are Sleipner’s nearest current sizes by thrust, in any of its lines.
- Nearest below: Sleipner SEP210/250TC, 550 lb, $9,023.
- Nearest above: Sleipner E350 HD eVision, 772 lb, $17,750.
Other makers’ current units of the same style, for the same end, within a quarter of its published thrust:
- Max Power CT325 (24 V), 717 lb, $6,510.
- VETUS Bow Pro Boosted 300, 661 lb, $11,291.
- Lewmar 300TT GEN 2 Tunnel Thruster, 550 to 616 lb, $7,339 to $10,499.