Engine Room Parts
Electrical, Sensors & Controls
Starters, alternators, breakers, and engine room monitoring systems for marine vessels
Request QuoteReliable Engine Monitoring & Control
Electrical components and sensors form the nervous system of marine engine rooms. Mercer Yachting supplies OEM starters and alternators, marine-rated circuit breakers, relays, and contactors alongside temperature, pressure, level, and RPM sensors. Our control modules and actuators enable automated engine management and remote monitoring. Each component is specified for marine voltage, signal types, connector standards, and IP ratings appropriate for superyachts, cruise ships, and commercial vessels.
What We Supply
Starters & Alternators
Marine-duty starters and alternators for main and auxiliary engines in 24V/32V systems
Circuit Breakers & Fuses
Marine-grade DC/AC breakers, breaker panels, and fuse holders meeting marine standards
Relays & Contactors
Electromagnetic and solid-state relays, marine contactors for high-current switching
Temperature Sensors
Thermocouple, RTD, and thermistor sensors for engine jacket water and exhaust monitoring
Pressure Sensors
Oil pressure, fuel pressure, and coolant pressure transducers with marine-rated housings
Level & Flow Sensors
Fuel tank, oil tank, and coolant level sensors; fuel flow meters
RPM & Position Sensors
Engine speed sensors, crankshaft position sensors, and tachometer transmitters
Control Modules & Actuators
Automation controllers, solenoid actuators, and valve positioners for engine systems
How to Specify
Provide These Details
- Operating voltage (12V, 24V, 32V DC/AC) and frequency
- Signal type (0-10V, 4-20mA, CAN bus, NMEA) and connector type
- IP rating requirement (IP65, IP67 for engine room moisture/saltwater)
- Temperature operating range and sensor range if applicable
- Engine make/model and OEM specifications
- Current draw or power rating for electrical components
Common RFQs We Handle
Marine Starter Motor 24V
Compact starter for main diesel engine in 24-volt system
Alternator 24V 150A
High-output marine alternator with marine regulator
DC Circuit Breaker Panel
Marine-rated main switchboard with overcurrent protection
Engine Temperature Sensor RTD
Pt100 resistance temperature detector for coolant monitoring
Oil Pressure Transducer
Marine pressure sensor with 4-20mA output signal
Fuel Level Sender
Tank-top float level sensor with resistance output
Engine RPM Sensor
Magnetic pickup tachometer for diesel engine speed monitoring
Solenoid Fuel Shutoff Valve
24V emergency fuel cutoff actuator
Marine Control Module CAN Bus
Networked engine management controller
Auxiliary Contactor
Heavy-duty DC contactor for generator start/stop
Pressure Relief Transducer
Dual-output pressure sensor for redundancy
Coolant Flow Switch
Paddle-type flow sensor for raw water cooling system
Alarm Control Module
Engine room alarm aggregator and notification system
Crankshaft Position Sensor
Timing reference for fuel injection or ignition systems
Relay Module Auto-Start
Automated auxiliary generator start/stop relay assembly
Frequently Asked Questions
Why is IP rating important for marine electrical sensors?
IP (Ingress Protection) ratings specify dust and moisture resistance. IP65 prevents water jets; IP67 survives temporary immersion. Engine rooms have spray, saltwater mist, and humidity, making IP67 the minimum standard for all electronic sensors.
What voltage systems are typical on superyachts?
Most superyachts use 24V DC for engine starting and auxiliary systems, with 32V systems on larger vessels. Separate 115V/230V AC systems power hotel loads. Always confirm voltage before ordering electrical components.
What is a 4-20mA sensor signal and why is it used?
4-20mA is an industry-standard analog signal where 4mA represents zero and 20mA represents full scale. It's robust against electrical noise over long distances and allows simultaneous power and signal transmission, ideal for remote engine room monitoring.
Can I upgrade from analog to digital CAN bus sensors?
Yes, if your engine control system supports CAN (Controller Area Network). CAN bus is more reliable, offers multi-sensor data sharing, and reduces wiring. Requires compatible engine management modules and displays.
How often should marine alternators be serviced?
Marine alternators should be inspected annually for bearing wear and brush wear. Replace brushes every 3-5 years or if output drops below 80%. Annual full-load testing ensures reliability during extended voyages.
What is the difference between a RTD and thermocouple temperature sensor?
RTD (Resistance Temperature Detectors) are more accurate and stable, ideal for engine jacket water monitoring. Thermocouples are faster-responding and can handle extreme temperatures but are less linear. RTD is standard for marine engine applications.
How do I integrate new sensors with existing engine alarms?
Existing 4-20mA or 0-10V sensors can be wired to a new alarm module with set thresholds. CAN bus sensors require compatible gateway modules. Always consult your engine manufacturer for approved integration methods to maintain warranty.
What is a solenoid-operated fuel shutoff and when is it mandated?
Solenoid fuel shutoff valves enable automatic engine shutdown in emergencies (loss of oil pressure, overheat, etc.). Most maritime regulations require them on vessels over 25m. They're powered by 24V DC and fail-safe design.
Delivery Footprint
Mercer Yachting delivers across the Mediterranean — Malta, Antibes, Palma de Mallorca, Barcelona, Genoa, Athens, Split — and worldwide via our global logistics network. Emergency parts dispatched same-day from our Malta hub.
Ready to Specify Electrical Systems?
Our marine electrical specialists can source OEM starters, sensors, and control systems for any vessel. Contact us with voltage, signal types, engine details, and monitoring requirements for a rapid quote.