Overview

The Blue Sea Systems C-Series Flat Rocker Circuit Breaker is a panel-mounted magnetic hydraulic breaker range for marine AC and DC electrical panels. It combines overcurrent protection and manual switching in one unit, with flat rocker operation for a clean panel face and clear status at the switch.

This range covers single-pole AC/DC breakers from 5A to 100A, plus double-pole and triple-pole AC main breaker configurations. Single-pole versions are rated up to 240V AC and 48V DC, while the AC main breaker versions support 120V AC and 240V AC applications depending on the pole configuration.

These breakers are a practical fit for boat electrical panels where the breaker also needs to act as the everyday switch for the protected circuit. Common onboard uses include branch circuit protection, DC loads, AC panel protection, and higher-load equipment circuits such as windlasses, bow thrusters, and inverters when the selected amp rating matches the system design.

Key features

• Flat rocker actuator sits flush in the ON position, helping reduce accidental switching on busy electrical panels.
• Colored actuator indication makes the OFF position easy to recognize during checks at the helm, cabin panel, or equipment space.
• Magnetic hydraulic, trip-free breaker design means the breaker cannot be held closed after a trip condition.
• Combines circuit switching and overcurrent protection in a single panel device, reducing the need for a separate switch on the same circuit.
• Single-pole versions cover 5A to 100A AC/DC circuits; AC main versions include double-pole and triple-pole options for 120V and 240V AC panel layouts.
• Rated operating temperature range from -40° C to 85° C suits engine rooms, cabins, and exposed electrical panels that see wide temperature changes.
• Uses 1/4-20 tin-plated brass terminal studs with 35 in-lb terminal stud torque and #6-32 stainless steel mounting screws with 6 in-lb mounting screw torque.
• Rated for 10,000 switching cycles for service as both breaker and manual switch in regular onboard use.

Variants

This C-Series Flat Rocker range is offered in several amp ratings and pole configurations. The single-pole versions cover AC and DC circuits, while the double-pole and triple-pole versions are AC configurations for main breaker use and multi-conductor switching.

The main differences across the range are current rating and number of poles. Single-pole variants run from 5A to 100A with matching AC and DC ratings, double-pole AC variants are available at 30A, 50A, 80A, and 100A, and the triple-pole AC variant listed here is 50A.

Installation and setup

Select the breaker by matching the amp rating, pole count, voltage type, conductor size, and protected circuit requirements. Single-pole breakers are used for one protected conductor, double-pole breakers can switch hot and neutral in a 120V AC main circuit, and triple-pole breakers can switch both hot lines and neutral in a 240V AC main circuit.

Terminal torque and mounting screw torque matter on a boat because vibration and temperature changes can loosen poor connections over time. Use the specified torque values, protect the terminals from accidental contact where required, and follow the vessel wiring plan and applicable marine electrical standards.

Compatibility and use on board

This breaker family fits marine electrical panel work where a flat rocker style is preferred and where the breaker needs to be accessible as a switch. It is useful for refits, panel rebuilds, and equipment additions when the installation calls for a C-Series breaker with the correct amp rating and pole count.

Boat owners and installers should confirm available panel space, cutout compatibility, voltage type, and load requirements before ordering. The right variant depends on the protected circuit, not only the equipment name, so the vessel wiring diagram and equipment manual should guide the final selection.