Extended Operational and Trade Vocabulary

Marine Electrical Systems and Shore Power glossary

The marine-electrical vocabulary: the ABB Azipod podded-propulsor range (D, ICE, M, XO) and the Dynafin concept, high-voltage distribution, shore connection for cold ironing, and the power-management and propulsion-drive terms. Grounds each term in the electrical system or the propulsion product it belongs to.

319 defined terms.

Showing 250 on this page (page 1 of 2).

A

ABB Azipod D: Medium-power azimuthing podded propulsor from ABB in the 1.6 to 7 MW range, used on ferries, cruise vessels, and offshore support ships.
ABB Azipod ICE: Ice-class variant of the Azipod podded propulsor designed for double-acting tankers and Arctic operation.
ABB Azipod M: Modular Azipod range from ABB covering 1.3 to 4.5 MW for mid-size commercial vessels.
ABB Azipod XO: High-power Azipod podded propulsor from ABB rated 7 to 22 MW per unit, used widely on large cruise ships.
ABB Dynafin: Electric propulsion concept from ABB using vertically mounted oscillating blades, announced in 2024.
ABB Emax 2: Air circuit breaker family from ABB used as main and tie breakers on marine main switchboards up to 6,300 A.
ABB HiPase: Protection and control IED platform from ABB applicable to marine MV switchgear.
ABB Onboard DC Grid: DC distribution architecture from ABB that ties generators, batteries, and propulsion drives onto a common DC bus.
ABB PEMS: Power and Energy Management System from ABB that coordinates generators, batteries, shore power, and propulsion loads.
ABB PowerCompact: Compact circuit breaker range from ABB used in marine secondary distribution.
ABB Tmax XT: Molded case circuit breaker family from ABB used on marine distribution boards up to 1,600 A.
ABB UniGear ZS1: Air-insulated medium-voltage metal-clad switchgear from ABB rated up to 24 kV used on marine HV systems.
ABC Anglo Belgian Corporation: Belgian builder of medium-speed marine diesel engines in the 600 to 10,800 kW range, including the DZC and DL36 series.
AC Excitation System: Brushless excitation arrangement on synchronous generators using a rotating AC exciter and rotating rectifier.
Active Front End: Regenerative converter topology used in marine variable-frequency drives to control harmonics and enable energy recovery.
Active Harmonic Filter: Power electronic device that injects counter-phase currents to cancel harmonic distortion on a shipboard bus.
Air Circuit Breaker: Low-voltage breaker that interrupts fault current in atmospheric air, used as the main breaker on most LV marine switchboards.
Air Cooled Alternator: Marine synchronous generator using ambient air rather than water-air heat exchangers for stator cooling.
Alternative Fuels Infrastructure Regulation: EU Regulation 2023/1804 requiring TEN-T core maritime ports to provide onshore power supply for container and passenger ships by 1 January 2030.
Alternative Maritime Power: Shore power program initiated by the Port of Los Angeles in 2004 to allow berthed vessels to shut down auxiliary engines.
Ampere Interrupting Capacity: Rated short-circuit current that a marine circuit breaker can safely interrupt at its rated voltage.
Amplidyne: Legacy rotating amplifier formerly used in marine steering gear and gun-mount drives, now historic.
Anti-Condensation Heater: Resistive heater inside a marine motor or generator that prevents moisture condensation when idle.
Argonaut Power Plant: Diesel-electric concept used on certain offshore support vessels integrating multiple gensets on a common bus.
Armature Reaction: Distortion of the main field flux in a generator caused by current flowing in the stator winding under load.
Asynchronous Motor: Induction motor commonly used for pumps, fans, and auxiliary drives aboard ship.
AutoChief 600: Propulsion control system from Kongsberg Maritime that integrates with the K-Chief PMS on commercial ships.
Automatic Voltage Regulator: Closed-loop controller that maintains a synchronous generator terminal voltage by adjusting excitation current.
Auxiliary engine: Medium-speed engine driving a generator.
Azimuth Thruster: Propulsion unit rotating 360 degrees about a vertical axis to direct thrust in any horizontal direction.

B

Back EMF: Voltage induced in a motor winding by its own rotation, opposing the applied voltage and limiting current at speed.
Backup Battery: Lead-acid or lithium battery bank supplying critical loads when the main and emergency generators are unavailable.
Battery Energy Storage System: Containerized or rack-mounted battery installation that provides peak shaving, spinning reserve, or zero-emission operation.
Battery hybrid propulsion: Diesel-electric plant supplemented by lithium-ion energy storage.
Battery Management System: Electronic system that monitors cell voltage, temperature, and state of charge in a marine battery pack.
Battery Room: A1 class space housing marine batteries with controlled ventilation, gas detection, and fire protection.
Becker Mewis Duct: Pre-swirl wake-equalizing duct with internal fins, developed by Becker Marine Systems, fitted ahead of the propeller.
Bidirectional Converter: Power electronic stage that allows energy to flow into and out of a battery bank on a DC grid.
Black start: Restoration of main switchboard from emergency generator after a blackout.
Blackout: Total loss of main electrical power on the ship requiring restart from the emergency switchboard.
BlueDrive PlusC: Diesel-electric and hybrid propulsion product family from Siemens Energy Marine.
BlueVault: Lithium-ion battery storage system from Siemens Energy used on hybrid ferries and offshore vessels.
Bonding Strap: Low-impedance conductor that ties metallic equipment to the ship hull for safety grounding.
Boost Charging: Higher-rate battery charge profile used to bring a depleted bank quickly back to operational state of charge.
Bow thruster: Transverse-tunnel thruster forward for low-speed maneuvering.
Breaker Coordination: Selective tripping scheme ensuring the breaker nearest a fault opens before upstream devices.
Brunvoll AR Azimuth Thruster: Retractable azimuth thruster from Brunvoll of Molde, Norway, used on offshore and special-purpose vessels.
Brunvoll RUC: Retractable underwater-mountable azimuth thruster from Brunvoll for dynamic positioning duty.
Brushless Excitation: Generator excitation system using a rotating exciter and diode wheel, eliminating slip rings and brushes.
Bus tie breaker: Switchboard breaker connecting two sections of the main bus, normally closed at sea.
Busbar: Solid copper or aluminum conductor that distributes power within a switchboard or distribution panel.
Busbar Trunking: Prefabricated enclosed busway used in engine rooms to carry heavy currents between switchboards and large loads.

C

Cable Gland: Mechanical fitting that secures a cable entering an enclosure and provides strain relief, sealing, and bonding.
Cable tray: Prefabricated tray supporting electrical cabling runs through accommodation and machinery blocks.
Capacitor Bank: Group of power factor correction capacitors connected to the bus to supply reactive power locally.
Carbon Brush: Sliding contact on slip rings or commutators used in older marine generators and DC motors.
Caterpillar 3500 series: Medium-speed marine diesel family.
Caterpillar 3600 Series: Inline 6 and 8 cylinder medium-speed diesels from Caterpillar in the 2,000 to 7,300 kW range.
Caterpillar C280: Heavy-duty medium-speed marine engine from Caterpillar evolved from the EMD 645 lineage.
Caterpillar C32: High speed marine diesel generator engine common on offshore vessels.
Caterpillar Marine MTA: Steerable azimuth thruster line marketed by Caterpillar Marine and Berg Propulsion.
Cavotec MoorMaster: automated vacuum mooring system used in container, ferry, and bulk berths.
Cavotec Shore Power Connection: Plug-and-socket and cable management systems from Cavotec for HV and LV shore power.
Class B Cable: IEC 60092 stranding class for flexible shipboard power cables.
Class D Insulation: Withdrawn IEC thermal class historically used for marine insulation, superseded by Class B, F, and H.
Cold Ironing: Onshore power supply enabling ships to shut down engines in port.
Color Line Oslo: Norwegian ferry operator whose Oslo terminal received Norway's first cruise-style shore power connection in 2011.
Common rail injection: High-pressure shared rail for electronically controlled injection.
Concept Marine Electric: Marine electrical contractor specializing in switchboards and motor control centers.
Constant Frequency Shaft Generator: Shaft generator system that maintains 50 or 60 Hz output despite variable shaft speed using a power electronic converter.
Converter Transformer: Special-design transformer feeding rectifier sections of a marine drive or shore-power conversion unit.
Corvus Energy: Canadian and Norwegian supplier of marine lithium-ion battery systems including the Orca, Dolphin, and Blue Whale ranges.
Cummins QSK Series: High-speed marine diesel from Cummins used as auxiliary, harbor generator, and emergency genset.
Cummins QSK60: 60-liter V16 marine diesel from Cummins used in workboat and large yacht generator sets.
Current Transformer: Instrument transformer that scales high primary current down to a 1 A or 5 A secondary for metering and protection.

D

Daihatsu DC-32: Medium-speed marine auxiliary engine from Daihatsu Diesel of Japan.
Daihatsu DK Series: Four-stroke medium-speed marine engines from Daihatsu Diesel widely used as auxiliary gensets.
DC Bus: Common direct-current distribution rail in an Onboard DC Grid or hybrid power system.
DC link: Direct current bus in frequency converters used for shaft generators and pod drives.
Dead Bus Closure: Closing a generator breaker onto a de-energized busbar without synchronization.
Dead Front Switchboard: Switchboard design where all live parts are inaccessible from the front, mandatory on modern ships.
Delta Connection: Three-phase winding configuration with no neutral, common in marine motors.
Diesel-electric propulsion: Multiple gensets feeding propulsion motors via main bus.
Differential Protection: Protection scheme comparing currents at two ends of a generator winding or transformer to detect internal faults.
Direct On Line Starter: Motor starter that connects the motor directly to full line voltage, used for small marine motors.
Distribution Board: Subordinate panel that splits power from a main switchboard feeder into multiple smaller branch circuits.
Droop Control: Generator governor and AVR characteristic that allows stable load sharing between paralleled units.
Dual-fuel engine: Engine running on both liquid and gaseous fuels (e.g., WinGD X-DF).
Dynamic Positioning Class 3: IMO MSC/Circ.645 DP notation requiring fully redundant power and electrical systems with physical separation.
DynaPower: Marine power electronic converters used in some battery-hybrid and shore-power conversion installations.

E

Earth Fault Indicator: Lamp or instrument that warns of insulation deterioration in an unearthed marine distribution system.
easYgen 3000XT: Genset controller from Woodward used for paralleling marine generators and managing PMS functions.
Echandia Marine: Swedish supplier of high-power lithium titanate marine battery systems for ferries.
Electric Tunnel Thruster: Transverse thruster driven by an integrated electric motor instead of a hydraulic or shaft drive.
Electronic Trip Unit: Microprocessor-based release on a circuit breaker providing adjustable overload, short-circuit, and ground-fault protection.
Emergency generator: Self contained generator above main deck supplying essential services on blackout.
Emergency Lighting: Inspected under 04000 emergency systems.
Emergency Switchboard: Switchboard fed by the emergency generator and emergency batteries supplying SOLAS-defined essential services.
EnergoProFin: Wartsila propeller cap with fins that affects shaft loading on plants with a shaft generator.
Energy Storage System: Generic term for batteries, supercapacitors, or flywheels integrated into a marine power plant.
Engine Mounted Generator: Alternator bolted directly to the engine flywheel housing, common on small auxiliary sets.
EPR Insulation: Ethylene propylene rubber insulation used in marine power and control cables to IEC 60092-353.
Equalizing Connection: Cable that ties together the negative terminals of paralleled DC compound-wound generators, mostly historic.
EU Fit for 55: 2021 EU legislative package incorporating FuelEU Maritime and the AFIR shore power mandate.

F

Fault Current Limiter: Device that limits the prospective short-circuit current on a bus, used in some MV marine systems.
Field Failure Relay: Protection relay that trips a synchronous generator if its excitation is lost.
Field Forcing: Temporary increase of AVR output to maintain voltage during a heavy load step or fault.
Filter Reactor: Inductor used in series with a harmonic filter to tune the filter to a specific frequency.
Fixed Pitch Propeller: Propeller with non-adjustable blades, typical on plants without a controllable pitch shaft generator arrangement.
Flicker: Visible variation of lighting caused by voltage fluctuations, regulated by IEC 61000-4-15.
Flywheel Energy Storage: Mechanical energy storage occasionally used for short-duration ride-through on offshore vessels.
Forced Commutated Converter: IGBT or IGCT based converter that controls switching independently of the line, used in marine drives and shore connections.
Frequency converter: Power electronic equipment converting AC to AC at variable frequency for shaft generators and motor drives.
FuelEU Maritime: European Union regulation imposing greenhouse gas intensity limits on shipping fuels, driving development of pooling mechanisms and compliance instruments.
Full Authority Digital Engine Control: Electronic engine controller used on certain modern marine gensets.
Fuse: Overcurrent protective device used in low-power marine distribution, often as a backup to molded case circuit breakers.

G

GE Power Conversion: GE Vernova business unit supplying marine drives, propulsion, and shore power converters, including the Inovelis pod.
GE VDM 25000: Family of medium-voltage variable speed drives from GE Power Conversion used in marine propulsion.
Generator Circuit Breaker: Air or vacuum breaker that connects a marine generator to the main switchboard.
Generator Paralleling: Process of synchronizing and load-sharing two or more generators onto a common bus.
Generator Set: Integrated diesel engine and alternator package supplying electrical power, also known as a genset.
Governor: Speed control device, mechanical Woodward UG or electronic GAC and Heinzmann types.
Gravity Battery: Mechanical energy storage using lifted masses, proposed for some marine and port applications.
Ground Detection Lamp: Three-lamp indicator that shows insulation status on an unearthed three-phase marine system.
Ground Fault Relay: Protection device that detects current flowing to the ship hull through insulation failure.

H

Harmonic Distortion: Deviation of voltage or current waveform from a pure sinewave, regulated by classification societies to 5 to 8 percent THD on marine buses.
Harmonic Filter: Passive LC or active converter that absorbs harmonic currents produced by nonlinear loads.
High Voltage Shore Connection: Berth-side equipment that supplies HV shore power to ships in accordance with IEC/IEEE 80005-1.
HiMSEN: Family of medium-speed four-stroke engines from Hyundai Heavy Industries widely used as marine auxiliary and main engines.
Hipot Test: High-potential dielectric test verifying insulation integrity of marine cables and machines.
HiPRO: Hybrid power and propulsion package from Hyundai Heavy Industries.
Hub Generator: Generator integrated within the propeller hub, used in some Voith Schneider and electric-pod concepts.
Hyundai HiMSEN H21/32: 21 cm bore HiMSEN engine commonly fitted as auxiliary on container ships and bulk carriers.
Hyundai HiMSEN H32/40: 32 cm bore HiMSEN engine used as main propulsion on small commercial vessels.

I

IEC 60034: International Electrotechnical Commission standard series for rotating electrical machines applicable to marine generators and motors.
IEC 60092: IEC standard series titled Electrical Installations in Ships covering design, installation, and cabling.
IEC 60533: IEC standard for electromagnetic compatibility of electrical equipment installed on ships.
IEC 61363-1: Standard for calculation of short-circuit currents in three-phase AC ship power systems.
IEC 61892: Standard series for mobile and fixed offshore units covering electrical installations.
IEC/IEEE 80005-1: International standard for high voltage shore connection systems at 6.6 kV and 11 kV, 50 or 60 Hz.
IEC/IEEE 80005-2: Standard for communication between ship and shore in HVSC installations.
IEC/IEEE 80005-3: Standard for low-voltage shore connection systems below 1 kV.
IGBT: Insulated gate bipolar transistor switching device used in marine variable frequency drives and active filters.
IGCT: Integrated gate-commutated thyristor used in medium-voltage marine drives such as ABB ACS 6000.
Igus Energy Chain: Cable carrier systems from Igus used to manage shore power cables on cranes and reels.
Inboard Shaft Bonding: Brush or slip ring assembly grounding the propeller shaft to prevent stray current corrosion.
Indar Shaft Generator: Permanent magnet and induction shaft generators built by Indar Electric of Spain, part of the Ingeteam group.
Insulation Monitoring Device: Device required on unearthed marine systems that continuously measures insulation resistance to the hull.
Inverter: Power electronic converter producing AC from DC, used in HVAC and shaft generator hybrids.
Isolation Transformer: Transformer separating the shore power supply from the ship system to eliminate ground loops.

K

K-Chief 600: Integrated automation, power management, and propulsion control system from Kongsberg Maritime.
Kongsberg AutoChief: Propulsion remote control system from Kongsberg Maritime often paired with K-Chief PMS.
Kongsberg SAVe Energy: Lithium-ion battery energy storage product line from Kongsberg Maritime for hybrid ships.
Kongsberg US 305 P30: High-power azimuth thruster previously branded Rolls-Royce, now Kongsberg Maritime.
kVA Rating: Apparent power rating of a generator or transformer in kilovolt-amperes.

L

LeClanche Marine: Swiss battery manufacturer supplying lithium-ion energy storage systems to passenger ferries and tugs.
LFP Battery: Lithium iron phosphate chemistry favored in marine applications for thermal stability and cycle life.
Liquid Cooled Alternator: Synchronous generator using a water or glycol jacket to remove heat from the stator.
Lloyd's Register Electrical Notation: Class notation covering compliance with the Lloyd's Register rules for electrical installations.
Load Bank Test: Performance test using a resistive or reactive load to verify generator output and PMS response.
Load Dependent Start: PMS function that starts a standby generator when load on running sets exceeds a threshold.
Load Shedding: Automatic disconnection of non-essential loads to prevent overload of running generators.
Local Operating Network: LON fieldbus used on some marine power management installations.
Low Voltage Shore Connection: Shore power supply below 1 kV, typically at 400 or 440 V, governed by IEC/IEEE 80005-3.

M

Main switchboard: Primary distribution board receiving generator output.
MAN 32/40: 320 mm bore four-stroke medium-speed engine from MAN Energy Solutions widely used as a marine genset and main engine.
MAN 32/44CR: Four-stroke common-rail diesel engine.
MAN 48/60: 480 mm bore four-stroke marine engine from MAN Energy Solutions for large main and auxiliary duty.
MAN L21/31: 210 mm bore four-stroke MAN auxiliary engine widely fitted as a genset on tankers and bulk carriers.
MAN L23/30H: Medium speed auxiliary engine widely fitted on bulk carriers and tankers.
MAN L27/38: Medium speed engine for propulsion and generator service.
MAN PTO L21/31: Power take-off shaft generator arrangement from MAN derived from the L21/31 engine.
Marine PMS by Marpoint: Power management system from Greek supplier Marpoint for small commercial vessels.
MarinElectric Shaft Generator: Shaft generator solutions from MarinElectric used in retrofit and newbuild installations.
MARORKA: Onboard energy and performance monitoring system widely fitted on container ships.
Master Slave Load Sharing: PMS scheme where one generator dictates frequency and the others follow in power output.
MCB: Miniature circuit breaker used in marine lighting, navigation, and small load circuits.
MCCB: Molded case circuit breaker used in marine distribution panels up to about 1,600 A.
Medium Voltage Switchgear: Switchgear rated above 1 kV and up to 36 kV used on cruise ships, large LNG carriers, and offshore vessels.
Megger Test: Insulation resistance measurement using a high-voltage DC ohmmeter, named after the original Megger Limited instrument.
Microvast: Supplier of lithium iron phosphate and nickel manganese cobalt cells used in some marine battery systems.
Mitsubishi UE Engine: Two-stroke crosshead marine diesel from Mitsubishi Heavy Industries, used mainly as main propulsion.
Molded Case Switch: Non-automatic switch in a molded case enclosure used as an isolator on marine panels.
Motor Control Center: Cabinet housing multiple motor starters with common busbars and unified protection.
MTU 595 Series: High-speed marine diesel from Rolls-Royce Power Systems and now Rolls-Royce Solutions Friedrichshafen.
MTU 8000 Series: 20-cylinder high-speed marine diesel from MTU rated up to 10 MW used in fast ferries and naval vessels.
MTU Series 2000: High-speed marine diesel from MTU used as auxiliary, propulsion, and harbor generator sets on yachts and workboats.
MTU Series 4000: High-speed marine diesel from MTU available in 8 to 20 cylinder configurations for propulsion and genset duty.

N

National Electrical Manufacturers Association: NEMA standards used alongside IEC standards on US-flag and US Navy shipboard electrical equipment.
Negative Sequence Relay: Protection device that trips a generator under unbalanced load conditions.
Neutral grounding resistor: NGR limiting earth fault current on HV systems.
Neutral Grounding Transformer: Distribution transformer used to derive a high-impedance neutral on marine HV systems.
NMC Battery: Nickel manganese cobalt chemistry used in marine lithium-ion battery systems where energy density is prioritized.
No Voltage Release: Undervoltage coil on a marine motor starter that drops out when supply voltage is lost.
Nominal voltage: Reference voltage of an array (33 kV or 66 kV) or export (132 kV to 525 kV) cable circuit.
Norwegian Electric Systems: Bergen-based supplier of integrated propulsion, switchboards, and shore power converters, part of HAV Group.

O

Off-Load Tap Changer: Manual tap changer on a marine transformer adjusted only when de-energized.
Onboard DC Grid: Architecture from ABB and others that distributes power as DC instead of three-phase AC.
Onshore Power Supply: European term for shore power equivalent to AMP and cold ironing.
Open Phase Protection: Relay that detects loss of one phase on a three-phase marine motor circuit.
Operational Profile: Time-weighted load distribution used to size hybrid battery and genset plants.
Overcurrent Relay: Protection relay that trips on currents exceeding a set threshold for a defined time.
Overspeed trip: Mechanical/electrical trip on engine overspeed.

P

Parallel operation: Two or more generators sharing load, controlled by sync check relay.
Permanent Magnet Generator: Rotating machine using rare-earth magnets instead of an excited rotor, used in some shaft generator and AVR pilot exciter arrangements.
Permanent Magnet Propulsion Motor: High-torque-density motor used in some podded and shaft-line marine propulsion drives.
Phase Sequence Indicator: Instrument confirming the rotation direction of a three-phase supply before connecting to a load or motor.
Pilot Exciter: Permanent magnet generator on the same shaft as a brushless main exciter, providing AVR power independent of residual magnetism.
Port of Long Beach Shore Power: Berth-side OPS installations supporting California regulation requiring at-berth emission reductions since 2014.
Port of Los Angeles Alternative Maritime Power: First major US implementation of high-voltage shore power for container ships, commissioned in 2004.
Port of Rotterdam Shore Power: Shore power program at Rotterdam covering the Holland America and offshore terminals.
Power Factor: Cosine of the angle between voltage and current waveforms, typically specified at 0.8 lagging for marine generators.
Power Factor Correction: Use of capacitors or filters to bring the bus power factor closer to unity.
Power management system: PMS auto load function starting and stopping generators with load.
Power Take Home: Function of a shaft generator running as a motor to propel the ship from auxiliary engines.
Power Take In: Use of a shaft generator as a motor to assist propulsion under heavy load.
Power Take Off: Conventional shaft generator operating mode where the main engine drives the alternator.
Praxis Automation Technology: Dutch supplier of integrated automation, alarm monitoring, and power management systems.
Prime mover: Engine or turbine driving a generator or propeller.
Protection Class IP: Ingress protection rating to IEC 60529 used to specify marine enclosures, typically IP44 to IP67 depending on location.
Pulse Width Modulation: Switching technique used by marine inverters to synthesize an AC waveform from a DC bus.

Q

Quadrature Droop: Reactive power droop characteristic on the AVR enabling stable reactive load sharing between paralleled generators.
Quick Connect Coupler: Plug and socket assembly used in low-voltage shore power and battery service connections.

R

Reactive Load Sharing: PMS function ensuring paralleled generators share VAr proportionally to their ratings.
Reactor: Inductive component used in marine harmonic filters, motor starters, and converter inputs.
Reefer Container Outlet: Refrigerated container receptacle typically rated 32 A at 440 V, three-phase.
Regenerative Braking: Use of an inverter to feed motor braking energy back into the DC link or onto a resistor.
Relay Coordination Study: Engineering analysis selecting protective settings for selective trip behavior in marine systems.
Remote Operating Mechanism: Motorized actuator allowing electrical operation of marine air circuit breakers.
Reverse power relay: Generator protection tripping on reverse kW flow.
Rheostat: Variable resistor formerly used in generator excitation and DC propulsion control, mostly historic.
Ride Through Capability: Ability of a drive or PMS to maintain operation through brief voltage or frequency disturbances.
Ring Main Distribution: Closed loop distribution arrangement used on some HV cruise ships for redundancy.
Rolls-Royce Bergen B Engine: Medium-speed marine diesel and dual-fuel engine, formerly Rolls-Royce, now Bergen Engines AS owned by Langley Holdings.
Rolls-Royce Bergen C Engine: Medium-speed marine gas and diesel engine from Bergen Engines AS.
Rotor Earth Fault: Insulation failure in the rotor winding of a marine synchronous generator, detected by dedicated relays.

S

Saacke Marine: German supplier of marine burners and electrical control systems for boilers and steam plants.
Saft Marine: French manufacturer of nickel cadmium and lithium-ion batteries used for emergency and propulsion service.
Sam Electronics: Hamburg-based supplier of marine bridge systems and switchboards, now part of Wartsila SAM Electronics.
Schaltbau: German supplier of marine contactors, switches, and DC switchgear, including the SCD high-current DC breaker family.
Schneider Electric Masterpact: Family of air circuit breakers from Schneider Electric used on marine LV switchboards.
Schneider Electric SM6: Medium-voltage metal-clad switchgear from Schneider Electric used on marine 6.6 and 11 kV systems.
Schottel SCP: Schottel combi drive combining azimuth thruster and CP propeller features.
Schottel SRP: Azimuth thruster series.
Selectivity: Probability of catching a fish of a given size, sex, or species relative to others.
Shaft Earthing Device: Brush or slip ring arrangement that bonds the rotating shaft to the hull for cathodic protection.
Shaft generator: Generator driven by main engine via PTO.
Shore Connection Box: Berth-side enclosure housing shore-side breakers, transformers, and the ship interface.
Shore Connection Transformer: Step-down transformer reducing port supply voltage to the ship system voltage.
Shore power: OPS or cold ironing infrastructure, IEC/IEEE 80005 series.