Pro Mariner Galvanic Isolators

Why Galvanic Isolation Matters for Your Boat

Any time your vessel is plugged into shore power at a marina, it shares an AC ground wire with every other boat on the same dock. That shared connection creates an invisible threat: stray galvanic currents that silently eat through outdrives, propellers, through-hulls, and sacrificial zinc anodes. A quality galvanic isolator is the single most cost-effective way to interrupt that current path and keep corrosion from becoming a costly repair bill.

Pro Mariner's ProSafe FS Series: FailSafe Technology

Pro Mariner addresses this problem with its ProSafe FS (FailSafe) Series of galvanic isolators — available in 30-amp and 60-amp models to match the most common shore-power configurations. The core engineering philosophy behind the ProSafe FS line is safety-first design: if a component ever fails, the isolator is engineered so that failure does not compromise the vessel's AC ground continuity. That "fail-safe" architecture is what sets these units apart from conventional galvanic isolators, which require a dedicated external monitor to verify that the safety ground is still intact.

Both models are built on robust Flat Pack Semiconductor platforms using high-power diodes capable of handling the extreme inrush currents that can occur during fault conditions — up to 3,000 amps on the FS30 and 5,000 amps on the FS60. The FS60 goes a step further with a self-cooling design that activates whenever it must conduct current, keeping operating temperatures in check during demanding conditions.

Key Features of the ProSafe FS Galvanic Isolators

• FailSafe Certified Design: Maintains AC safety ground integrity even in the event of component failure — no external monitor required.
• UL Certified & ABYC A-28 Compliant: Meets the industry's marine electrical safety standard, certified by Underwriters Laboratories.
• Ignition Protected (ISO 8846): Safe to mount within an engine compartment.
• Gold-Plated Terminations: Installed directly in the onboard green safety ground wire, between the AC inlet and AC panel, for a reliable, corrosion-resistant connection.
• Model Selection Made Simple: Use the ProSafe FS30 for single 30-amp shore cord applications; the ProSafe FS60 covers one 50-amp or two 30-amp shore cords.

Award-Winning Protection from a Trusted Marine Brand

The ProSafe FS Series earned the prestigious 2007 IBEX Award for Innovation, recognizing its engineering contribution to marine shore-power safety. Installation is straightforward — simply splice the unit into the green safety ground wire between your AC inlet and AC panel to electrically separate your DC bonding system from the shore AC ground. No special monitoring hardware or complex wiring is needed.

For boaters who spend significant time at the dock, investing in a Pro Mariner galvanic isolator is one of the smartest moves you can make to protect your hardware, extend zinc life, and reduce long-term maintenance costs. Explore the full lineup of Pro Mariner marine electrical products or browse all galvanic isolators to find the right solution for your vessel.