ProMariner ProSafe FS30 connections

The ProSafe FS30, part 22034, is for a single shore cord up to 30 A. The manufacturer's FS30/FS60 owner's manual is retained here from Defender's document mirror because a working manufacturer-hosted copy was not located. Its printed issue is 04/08; confirm it against the label and instructions supplied with your unit.

The cover distinguishes the FS30 from the FS60 used for a 50 A cord or two 30 A cords. Its separate 41 A product rating does not authorise using an FS30 on a larger shore inlet.

Only the green or green/yellow protective-earth conductor passes through the two non-polarised studs. The diagram's SHORE ⏚ denotes the incoming earth and BOAT ⏚ the vessel's AC ground/bonding bus. Line and neutral follow their own protected AC paths.

Printed page 3 requires a series installation near the shore entry with no alternative earth conductor bypassing the isolator. Printed page 5 shows the single-30 A FS30 arrangement. The other diagram on that page is an FS60 dual-inlet arrangement and must not be copied as an FS30 installation.

The manual calls for a dry, ventilated location, clearance around and above the unit, and unobstructed cooling. Its safety label limits ambient temperature to 50°C. Secure all four mounting positions and protect the connections from corrosion, moisture and salt spray.

Printed page 3 specifies 8.8 in-lb stud-nut torque. This is a small-terminal torque, not a battery-bus torque. Follow the actual unit's instructions if its hardware differs. The manual says the case does not require a separate ground connection.

The intended failure mode preserves the protective-earth path, but a shorted isolator no longer blocks galvanic current. The unit has no built-in status monitor. A shore connection that still works is therefore not proof of continuing corrosion protection.

Printed page 7 gives a qualified-service test using an isolated unit and a meter's diode range, allowing readings to settle in both directions because of the internal capacitor. Shore power must be disconnected and every protective-earth connection restored before service resumes. Check the manufacturer's procedure after a suspected lightning event.

The catalog drawing omits the inlet, AC breakers, leakage protection and any transfer equipment. It documents the isolator's earth-path role, not the completeness of the boat's AC system.