Dordrecht · Netherlands Engineered since 1898
TKBS SERIES · SUBMERSIBLE ASYNCHRONOUS

HEAVY-DUTY SUBMERSIBLE DRIVE.

Submersible electric motors for dredging, offshore and marine applications. 100 kW to 7000 kW. Operating depth to 300 metres. Continuous submerged service under seawater, pressure and full industrial load.

7000kW
Max Power
6000V
Voltage
300m
Depth
IP68
Protection
Scroll
01 / Positioning

Specialist underwater electric drives.

Trident builds submersible electric motors for the most demanding underwater applications. Cutter suction dredgers. Trailing suction hoppers. Deep sea sand mining. Offshore retrofit projects.

Every motor is engineered to operate continuously under seawater, pressure and full industrial duty. Hermetically sealed, oil- or air-filled construction. 316L stainless steel where it matters. Class H insulation. Multi-stage shaft protection. Pressure balancing for deep sea service.

We do not build commodity motors, and we do not build luxury motors. We build heavy-duty drives priced for operators who run them hard, and engineered so they keep running.

EstablishedVan Bodegraven · 1898
HeadquartersDordrecht, Netherlands
Service networkNL · GR · Global
CertificationIP68 · Class H · IEC
Warranty12 months standard
PRODUCTION · DORDRECHT

Engineered in Dordrecht.

TKBS submersible motor manufacturing.

02 / Capability envelope

The numbers that matter underwater.

The operating envelope of the TKBS series. Every value below represents a delivered configuration. We engineer outside this envelope on request.

DOC · TKBS-CAP-2026 · v1.0
Power range
100–7000kW
34 standard ratings
across the TKBS series
Voltage
≤ 6000V
380 / 460 / 690 / 1000
1500 / 3000 / 6000 V
Submersible depth
300m
Type I ≤ 35 m
Type II ≤ 300 m
Pole configurations
4–24P
4P · 6P · 8P · 10P · 12P
16P · 20P · 24P
Protection class
IP68
Continuous submerged
operation, seawater
Insulation
Class H
Damp-proof process
vacuum impregnation
Speed range
240–1750rpm
Asynchronous
VFD compatible
Frequency
50/60Hz
Soft start, inverter
or DOL switching
Typical lead time
12–16weeks
Build to spec
committed date per commercial offer
03 / Applications

Where Trident motors operate.

/ 01
Cutter Suction Dredgers
CSD propulsion & cutter drive
High-torque drive for the cutter head and submerged dredge pump. Engineered for continuous abrasive duty on inland and harbour CSD platforms.
/ 02
Trailing Suction Hoppers
TSHD submerged pump motors
Underwater pump motors for TSHD trailing arms. Pressure-compensated construction, seawater-resistant, designed for variable-speed inverter control.
/ 03
Deep Sea Sand Mining
Operating depth to 300 m
Pressure-balancing devices, multi-stage shaft sealing and oil-filled chambers for sand mining vessels operating at deep sea pressures.
/ 04
Offshore Marine Retrofit
Replacement & modernisation
Form-fit replacements for obsolete submersible motors. Nameplate-driven engineering, drop-in dimensions, modernised VFD-ready windings.
/ 05
Custom Engineered Drives
Specification-led design
Outside the standard envelope. Bespoke voltage, depth, mounting and shaft configurations for projects where no catalogue motor fits.
Submersible motor production workshop
WORKSHOP · PRODUCTION LINE
TKBS SERIES
51°48'N · 04°39'E
04 / Construction

Engineered without compromise.

Submersible service is unforgiving. Sealing failures cost vessels their day rate. Insulation failures cost weeks of downtime. Every detail of the TKBS construction is sized for that reality.

/01
Multi-stage shaft sealing
Mechanical seal as primary stage, oil seal as secondary, sealed by fluoroelastomer rings. Engineered for long-duration submerged storage.
/02
316L stainless welded shell
Corrosion-resistant welded outer construction. All bolts and fasteners in 316L stainless. Built for continuous seawater contact.
/03
Pressure balancing for deep sea
Automatic pressure balancing devices equalise internal and external pressure for deep sea sand mining at depths to 300 metres.
/04
Five-zone protection sensing
Overheat, motor chamber moisture, oil chamber moisture, cable chamber moisture and bearing temperature, each routed to the switchgear protector.
/05
VFD-compatible windings
Designed with full consideration of inverter harmonics and frequency variation. Suitable for soft start, full inverter control or diesel-direct drive.
05 / Standard ratings

TKBS Series typical specification.

Excerpt from the TKBS catalogue. The full ratings table runs to 34 standard configurations. Custom voltages, poles and dimensions on request.

DOC · TKBS-RAT-2026 · v1.0
Type Capacity Voltage cos φ Eff. % Pull-out T
TKBS-355/P355 kW380 / 460 V0.7291.01.8
TKBS-630/P630 kW690 V0.7391.51.6
TKBS-1000/P1000 kW1000 / 3000 V0.7492.01.5
TKBS-1600/P1600 kW3000 V0.7592.01.5
TKBS-2500/P2500 kW3000 / 6000 V0.7692.51.4
TKBS-4000/P4000 kW6000 V0.7792.51.4
TKBS-6300/P6300 kW6000 V0.7792.51.4
34 standard ratings · 50 / 60 Hz · Async submersible · IP68 · Class H
View full specification →

Frequently asked questions

What power range do Trident submersible motors cover?
Trident TKBS submersible motors cover 100 kW to 7000 kW, with 34 standard ratings and project-engineered designs at the top of the range.
What voltage and pole configurations are available?
Voltages from 380 V up to 6000 V, with 4-pole up to 24-pole windings for low-speed, high-torque dredge and pump duty.
What operating depth do the motors reach?
Type I motors to 35 m and pressure-balanced Type II motors to 300 m operating depth.
Is there a warranty on Trident submersible motors?
Yes. Trident submersible motors carry a standard 12-month (1-year) warranty.
Can Trident replace an obsolete submersible motor from another brand?
Yes. From a nameplate photograph we reverse-engineer a form-fit TKBS replacement with matching mounting, shaft and terminal dimensions, engineered in Dordrecht, the Netherlands.
Can Trident build a motor exactly to our specification?
Yes. Trident builds motors one to one from a drawing, datasheet or nameplate: form, fit and function. The design is made around your existing installation, so foundation, shaft coupling and connection dimensions stay exactly as they are.
Which soils and media can the motors handle?
TKBS motors run in salt, brackish and contaminated water and in nearly all chemical soil compositions. Materials and seals are selected per project, for dredging, deep sea sand mining and mining duties such as slurry transport and mine dewatering.
How does the order and approval process work?
In six stages: offer, order and kick-off, engineering, customer approval, manufacturing and testing, final release. The technical package with performance data, dimensional drawing and interface dimensions is submitted for your written approval, and manufacturing starts only after that approval.
What is the lead time for a build-to-spec motor?
Typical lead time is 12 to 16 weeks, build to spec. The committed delivery time is stated in the commercial offer, and the date of your written design approval starts the production clock. Motors are preferably delivered with cables pre-mounted and factory-tested.
06 / Engineering inquiry

Send your nameplate.
We engineer the replacement.

Most replacement projects start with a photograph of a nameplate and a phone call. Send us your existing motor data, the application and the constraints, we respond with a technical proposal, drawings and a delivery commitment.

Upload Nameplate → Request Engineering Support → Send Specifications → Speak to an Engineer →