Overview

The Blue Sea Systems 3106100 is a double-pole 120V AC 30A A-Series ELCI main circuit breaker for boat AC shore power systems. It trips on short circuit, overload, and leakage to ground, with a 30 mA leakage trip level and 5000A interrupt capacity, so it covers both overcurrent protection and leakage protection at the main breaker position.

This breaker mounts from the front of the panel and uses a magnetic hydraulic trip-free mechanism. It is rated for 240V AC maximum, 120V AC per pole, and it is ignition protected, which matters in marine installations where equipment location and vapor safety have to be considered.

Key features

• Double-pole 30A ELCI main breaker for 120V AC shore power service
• Trips on short circuit, overload, and leakage to ground with a 30 mA leakage threshold
• Front panel mount layout for installation in a power distribution panel
• Magnetic hydraulic trip-free mechanism
• 5000A interrupt capacity with a maximum voltage rating of 240V AC, 120V AC per pole
• Ignition protected, with an operating range from -35 C to 65 C

Compatibility and fit

This model suits boats that use a 30A 120V AC shore power main and need an ELCI breaker at the distribution panel. It fits new panel builds and replacement work where an A-Series front-mounted breaker is specified and where the AC main needs leakage protection along with standard breaker protection.

Check the panel layout, enclosure depth, and system rating before ordering. If the boat uses a different shore power standard, such as 230V AC service or a higher-amperage main, this is not the right breaker.

Installation and setup

Installation belongs in a permanently installed enclosure or power distribution panel, not in a portable or cord-connected setup. Correct line and load wiring is important, and the neutral should not be grounded on the load side of the breaker.

Routine testing matters with any ELCI device. The breaker should be checked with its test function on a regular schedule so the crew can confirm it still trips and resets as intended.

Use on board

This breaker is a good match for cruising boats and other vessels with a single 30A 120V AC shore power inlet where the main AC panel is the right place for leakage protection. It also works well for panel refits when the existing setup uses the A-Series format and a white toggle main breaker.