Blue Sea Systems C-Series Flat Rocker Circuit Breaker, Double Pole, 48V DC, Magnetic Hydraulic, Trip-Free

Overview

The Blue Sea Systems C-Series is a double-pole flat rocker circuit breaker for DC marine electrical systems where high-current load protection and manual switching are needed in one panel-mounted device. This magnetic hydraulic breaker is available in 150A DC and 200A DC versions, with two poles, a 48V DC maximum rating, and a 5000A interrupt capacity at 48V DC.

It is a practical match for equipment such as inverters, bow thrusters, and windlasses, where the circuit breaker must handle heavy DC loads while staying accessible at the electrical panel. The flat rocker actuator sits flush in the ON position to reduce the chance of accidental switching, and the colored actuator clearly shows when the breaker is OFF.

The trip-free mechanism means the breaker cannot be held closed after a trip. For installers, the 1/4-20 tin-plated brass terminal studs and 6-32 stainless steel mounting screws support a secure installation in marine electrical panels exposed to vibration and regular service checks.

Key features

• Double-pole C-Series breaker for high-current DC circuits, with 150A DC and 200A DC variants.
• Magnetic hydraulic trip-free construction prevents the breaker from being held closed after a trip.
• Combines circuit protection and manual switching in one device, reducing the need for a separate switch in many panel layouts.
• Rated for up to 48V DC with 5000A interrupt capacity at 48V DC.
• Flat rocker actuator sits flush when ON to help prevent accidental switching in busy electrical panels.
• Colored actuator gives a clear OFF indication during troubleshooting, shutdown, or system checks.
• 1/4-20 tin-plated brass terminal studs support secure cable connections for high-current circuits.
• Operating temperature range from -40° C to 85° C suits engine rooms, technical spaces, and exposed marine electrical compartments.
• 10,000 switching-cycle rating supports regular use as both breaker and service switch.

Variants

This C-Series double-pole flat rocker breaker is offered in two DC amperage configurations. The amperage rating is the main difference between the variants.

Both variants share the same double-pole format, flat rocker actuator style, magnetic hydraulic trip-free breaker type, 48V DC maximum rating, 5000A interrupt capacity at 48V DC, and 1/4-20 tin-plated brass terminal studs.

• 7475: 150A DC. This version suits high-current DC circuits where the system design calls for a 150A breaker in a double-pole panel position.
• 7476: 200A DC. This version suits high-current DC circuits where the system design calls for a 200A breaker in the same C-Series double-pole format.

Installation and fit

This breaker is intended for panel mounting in marine electrical systems. The terminal stud torque is 35 in-lb, and the mounting screw torque is 6 in-lb, which helps installers tighten the breaker correctly without damaging the hardware or panel.

The double-pole layout allows both poles to trip together if one pole trips, which is important in circuits where paired conductors or linked circuit control must open together. Before installation, match the breaker amperage to the wire size, load requirements, system voltage, and the vessel electrical plan.

Use on board

For cruising boats, sportfishers, and workboats with heavy DC equipment, this breaker gives the operator a clear and accessible way to shut down or reset a protected circuit. It is especially useful in battery and load distribution areas where service access, clear status indication, and dependable trip behavior matter during real-world use.