Resistors for Marine & Offshore

Marine and offshore platforms — container ships, ferries, LNG carriers, FPSOs, offshore wind service vessels — operate medium-voltage AC and DC bus systems (440 V / 690 V / 6.6 kV) under continuous salt-fog, humidity and vibration. Resistors must be type-approved by classification societies (DNV, ABS, Lloyd's Register, BV, CCS) and meet IEC 60945 environmental requirements: 5–13.2 Hz at ±1 mm displacement, 13.2–100 Hz at 7 m/s² acceleration, and IEC 60068-2-52 salt-mist Kb. Pre-charge and dynamic-braking resistors for electric propulsion drives handle 100–500 kW pulse loads with IP56 stainless steel enclosures. Neutral-grounding resistors limit single-line-to-ground fault current to 5–25 A on isolated marine networks, while crowbar resistors protect 6 kV shaft generators during fault ride-through.