Blue Sea 7049 200A Panel Mount Circuit Breaker

The Blue Sea Systems 7049 is a 200 amp panel mount breaker from the 187 Series, using a thermal bi-metal blade, rated to 48 volts DC.

A thermal bi-metal blade responds to heat rather than magnetic field, which makes it tolerant of the brief surges a motor draws on starting. A magnetic hydraulic breaker of the same rating would nuisance-trip on those surges, so the mechanism choice matters as much as the amperage.

Interrupt capacity varies with system voltage: 5,000A at 12V DC, 3,000A at 24V DC and 1,500A at 42V DC. That is worth checking rather than assuming, since a breaker adequate at 12 volts has considerably less margin at 42.

The large lever indicates trip status by its vertical or horizontal orientation, readable across a compartment rather than needing a close look. Terminals are 5/16 M8 studs torqued to 75 in-lb with clearance for heavy gauge lugs, the operating range runs -40°C to 85°C, and it is waterproof and ignition protected. Explore more marine circuit breakers.

• Thermal bi-metal tolerates motor starting surges
• A magnetic breaker would nuisance-trip on those
• Interrupt capacity drops as system voltage rises
• Lever orientation shows trip status across a compartment