Overview

The Blue Sea Systems A-Series Toggle Circuit Breaker is a single-pole, trip-free AC/DC circuit breaker for boat electrical panels where a circuit needs both overcurrent protection and manual switching at the panel. It uses a magnetic hydraulic mechanism, a toggle actuator, and a panel-mount format that fits the way many helm, cabin, and service panels are built.

This range covers low-load and higher-load branch circuits, with listed amperage options from 2.5A to 50A. Verified configurations are rated for 240V AC and for DC systems up to either 32V DC or 65V DC depending on the selected amperage, so the final selection should be matched to the vessel voltage, conductor size, and protected equipment.

The trip-free action means the handle cannot be held in the ON position during a fault current condition. That matters on board, where vibration, moisture, and tight panel access can make it harder to notice a circuit problem right away.

Key features

• Single-pole toggle breaker for AC or DC branch circuits in marine electrical panels.
• Magnetic hydraulic trip-free breaker type combines switching and circuit protection in one panel device.
• Available in 2.5A, 5A, 8A, 10A, 15A, 20A, 25A, 30A, 40A, and 50A ratings to match different protected loads.
• Color options include black, red, and white toggles, with the available color depending on amperage.
• Interrupt capacity is listed at 3000A at 120V AC, 1500A at 240V AC under TUV, 3000A at 240V AC under UL 1077, and 7500A at 65V DC.
• Operating temperature range runs from -40 degrees C to 85 degrees C for use in hot panels, cold storage conditions, and exposed marine environments.
• Uses #10-32 stainless steel terminal screws and #6-32 stainless steel mounting screws for secure panel installation.
• Meets ABYC standards and carries UL 1077, TUV, CE, and CSA compliance on verified A-Series configurations.

Variants

This A-Series toggle breaker range varies by color and amperage. The available colors are black, red, and white, while the current ratings span from 2.5A through 50A so panel builders can match each breaker to the load and wiring plan.

Across the listed configurations, the product remains a single-pole toggle circuit breaker with magnetic hydraulic, trip-free operation. Voltage rating can vary by amperage, so the selected breaker should be checked against the vessel system and the circuit being protected before installation.

Installation and setup

Install this breaker in a compatible marine electrical panel where the toggle is accessible and the rear terminals are protected from accidental contact. Terminal screw torque is listed at 14 in-lb, while mounting screw torque is listed at 6 in-lb, which helps maintain proper clamping without over-stressing the hardware.

The breaker rating should be selected for the protected circuit, not simply for the equipment load. On a boat, that means matching the breaker to the wire gauge, expected continuous load, inrush behavior, and the applicable AC or DC panel standard.

Compatibility and use on board

This breaker is a practical match for helm panels, cabin distribution panels, electronics circuits, lighting circuits, pumps, and other protected loads where toggle control is preferred over a rocker. The choice of toggle color can also help separate critical circuits, DC loads, AC functions, or service groups in a crowded panel.

For refits, the A-Series format is especially useful when replacing like-for-like breakers in Blue Sea Systems panels or when building a clean, serviceable custom panel with consistent breaker style across multiple circuits.