NewMar Galvanic Isolators

NewMar Galvanic Isolators: Proven Protection Against Marine Corrosion

Any boater who has dealt with a pitted prop shaft, eroded through-hull fitting, or prematurely eaten sacrificial zinc knows how quietly destructive galvanic corrosion can be. NewMar, a manufacturer with over 50 years of marine-grade DC power engineering behind them, has engineered a focused solution in their line of galvanic isolators — purpose-built to intercept the stray currents responsible for that corrosion before they can do damage.

How NewMar Galvanic Isolators Work

When a vessel is connected to shore power at a marina, stray, low-voltage current flowing between the AC safety ground and the DC bonding system is a principal cause of galvanic action. Installing a galvanic isolator between the AC safety ground and DC bonding system blocks the majority of these low-voltage currents, significantly reducing corrosive action on zincs while maintaining the integrity of the critical safety ground path. The practical benefit is real: significant savings in boat haul-out fees and zinc replacement costs.

NewMar's GI Series: Failsafe Design and ABYC Compliance

NewMar offers galvanic isolators in multiple amperage ratings — including the GI-30 and GI-50 models — to match the shore power circuit of virtually any vessel from a small runabout to a large cruiser or sailboat. Their latest-generation units reflect a commitment to keeping pace with evolving industry standards: NewMar's latest galvanic isolator meets the ABYC A-28 2019 standard, including a failsafe design, and is built to meet the strictest temperature and current tests for a robust galvanic protection solution.

A key engineering detail sets the NewMar GI series apart from simpler diode-only designs. All units feature a large capacitor, providing a secondary low-impedance path for sending AC current to the ground. This capacitor-backed architecture adds an important layer of redundancy, ensuring that even in a fault condition the safety ground path remains intact — a critical consideration flagged by the ABYC failsafe requirement.

Internal components and heat sinks are sized to carry away all of the heat generated by shore power current, making the units well-suited for continuous liveaboard or long-term marina use where the isolator handles sustained loads rather than just occasional connections. The GI series is commonly installed on the center console of cruisers, sailboats, and yachts.

Why Choose NewMar for Galvanic Isolation?

NewMar Power has been the leading manufacturer of power electronic products for over 50 years, and that depth of experience shows in the engineering rigor behind even a single-SKU product like a galvanic isolator. NewMar is a globally trusted manufacturer of DC and AC power equipment, known for rugged, marine-grade engineering, with over 50 years of design experience delivering solutions tailored for extreme marine, military, and industrial environments. Choosing a NewMar galvanic isolator means selecting a product designed by engineers who understand not just corrosion chemistry, but the full electrical ecosystem of a working vessel.

Whether you are fitting out a new boat or upgrading an aging installation, a NewMar galvanic isolator is a compact, cost-effective investment that pays for itself many times over in protected hardware and avoided yard bills. Browse the full selection of galvanic isolators or explore the complete NewMar product lineup for all your marine electrical needs.