Overview

The Blue Sea Systems 1503 is a 120V AC 360 panel with a 30A ELCI main and five 15A branch breakers in a flat rocker layout. It gives you one place to switch and protect a small group of onboard AC circuits while adding leakage protection at the main. For boats running 30A shore power service, that is the key difference between this panel and a standard branch-only AC panel.

The main ELCI trips at 30mA, and the panel uses Blue Sea A-Series breakers with green ON LEDs and backlit label positions. That makes day-to-day use easier when the panel is mounted in a cabin, helm area, or electrical locker where lighting is often poor and you need to see circuit status at a glance.

This panel makes sense for boats that need a straightforward 120V AC distribution setup with five branch circuits instead of a larger custom panel. It is also part of the 360 panel family, which helps when you are matching an existing Blue Sea 360 layout or planning a later panel rework.

Key features

• 30A ELCI main breaker with 30mA leakage trip
• Five 15A branch breakers for separate 120V AC circuits
• 120V AC panel format suited to 30A shore power systems
• Blue Sea A-Series flat rocker breakers
• Green ON LEDs for quick circuit status checks
• Backlit label positions for easier identification in low light
• Panel size of 7.75 x 4.88 x 3.99 in. for tighter mounting spaces

Installation and fit

The overall size is 7.75 x 4.88 x 3.99 in. (196.85 x 123.95 x 101.35 mm), so rear clearance matters before you commit to a bulkhead or cabinet face. The 3.99 in. depth is worth checking in shallow helm consoles and lockers where wire bends and terminal access can take up more room than expected.

This model uses a 30A ELCI main and five 15A branch positions, so it is best matched to boats with a modest AC load plan. If the rear of the panel will be exposed inside a locker or mounted near other equipment, insulating panel backs are separate parts rather than included with the panel.

Electrical and system integration

The layout suits a boat that brings in 120V AC service and then splits that feed across a handful of onboard circuits. Common examples include receptacle runs, a battery charger, a water heater, or other dedicated AC loads that need individual branch protection and switching at the panel.

Before replacing an existing panel, confirm that your vessel uses 120V AC service and that the branch circuit plan matches the five 15A configuration. This is a good fit for owners and installers who want one AC main with leakage protection and a clean five-circuit branch panel in the same footprint.