Blue Sea A-Series 40 Amp Circuit Breaker Black Toggle Double Pole

The Blue Sea A-Series 40 Amp Circuit Breaker Black Toggle Double Pole is the industry-standard protection device for electrical systems requiring robust dual-pole switching and overload protection. Designed for marine, RV, off-grid, and industrial panel installations, this circuit breaker combines the dual functionality of an isolation switch with automatic overcurrent protection—eliminating the need for separate components. It serves applications where both legs of a 240V circuit or two independent 120V circuits require coordinated protection under a single control mechanism.

This double-pole breaker employs Blue Sea Systems' proven A-Series toggle mechanism, delivering predictable trip characteristics and reliable manual isolation. The 40-amp rating accommodates moderate to heavy loads while the black toggle handle offers clear on/off status visibility and ergonomic operation in tight panel spaces. The dual-pole configuration means both conductors trip simultaneously if either pole detects an overcurrent condition, providing balanced circuit protection and preventing nuisance failures. Compact form factor and standard DIN-rail mounting interface ensure compatibility with Blue Sea electrical panels and other modular marine and RV distribution systems.

This breaker is ideal for boat owners, RV enthusiasts, and off-grid installers seeking drop-in replacements or upgrades to existing Blue Sea panel configurations. It excels in protecting 240V appliances, split-phase water heaters, inverter/charger units, and two-circuit branches where simultaneous disconnection is required. Installation requires no special tools—simply slide the breaker onto the DIN rail and snap into place. Weighing just 0.3 lbs, it integrates seamlessly into existing enclosures without adding significant bulk, making it the trusted choice for systems where safety, simplicity, and switching reliability are non-negotiable.