Blue Sea 7443 UL-489 Circuit Breaker - 20A Flat Rocker

The Blue Sea 7443 UL-489 Circuit Breaker – 20A Flat Rocker is a single-pole magnetic hydraulic circuit breaker engineered to meet strict UL-489 specifications for marine electrical systems. Built to the demanding standards required by Navy, Army, and Coast Guard vessels, as well as other platforms operating under Code of Federal Regulations Title 46 (CFR 46), this breaker delivers reliable overcurrent protection in high-reliability environments where electrical failure is not an option.

Rated for 20-amp DC service at a maximum voltage of 80V DC, the model 7443 employs a trip-free magnetic hydraulic mechanism that responds instantly to fault conditions while resisting nuisance trips from inrush current common in marine and tactical power systems. The flat rocker actuator provides tactile feedback for manual operation and status verification, while the #10-32 screw terminals with tin-plated brass construction ensure corrosion-resistant connections critical in salt-air and high-humidity environments. Its compact form factor (3 × 2 × 5 inches) integrates into tight electrical panel layouts without sacrificing accessibility.

This breaker is specified for applications requiring certified UL-489 compliance—primarily vessel electrical systems, specialized power distribution in military platforms, and offshore installations where regulatory documentation is mandatory. Operators and marine electricians rely on Blue Sea Systems breakers for consistency with federally mandated electrical standards and proven performance in harsh operating conditions. The 7443 addresses a specific niche: low-voltage DC circuits requiring both regulatory certification and the durability expected in unforgiving maritime and tactical environments.

Blue Sea Systems holds long-standing recognition as the industry standard for marine-grade electrical components. The UL-489 certification distinguishes this breaker from general-purpose alternatives, ensuring it meets the exact electrical and mechanical performance requirements outlined in federal vessel construction codes. For buyers tasked with maintaining CFR 46 compliance or upgrading vessel electrical systems to certified specifications, the model 7443 provides direct, specification-verified replacement or new-installation capability.