Blue Sea Systems UL-489 Circuit Breaker, 240V AC, 2-Pole, Flat Rocker

Overview

The Blue Sea Systems UL-489 Circuit Breaker is a 2-pole, flat rocker AC circuit breaker for marine electrical panels and equipment circuits that require UL 489 protection. This range covers 10A, 15A, 20A, 25A, and 30A ratings, with a maximum voltage of 240V AC, so it suits many AC branch circuit and panel protection jobs on board.

The breaker uses a magnetic hydraulic, trip-free mechanism and has a 5000A interrupt capacity. The flat rocker actuator sits flush in the ON position, which helps reduce accidental switching in tight panel locations, lockers, and control stations where hands, gear, or clothing can brush against the panel.

Connection is through 1/4"-20 tin-plated brass terminal studs, with #6-32 stainless steel mounting screws. The operating temperature range is -40° C to 85° C, giving it practical tolerance for engine room areas, machinery spaces, pilothouse panels, and other protected marine electrical locations.

Key features

• UL 489 circuit breaker range for vessels and installations where UL-489 protection is required.
• 2-pole configuration for 240V AC circuits that need both poles switched and protected together.
• Magnetic hydraulic, trip-free breaker action means the breaker cannot be held closed after a trip condition.
• Flat rocker actuator sits flush in the ON position to help limit accidental switching on busy panels.
• 5000A interrupt capacity for AC fault protection within the breaker rating.
• 1/4"-20 tin-plated brass terminal studs support secure cable connections in marine AC panel work.
• Rated for 10,000 switching cycles, with an operating temperature range from -40° C to 85° C.
• CSA certified and UL 489 rated for installations that require recognized regulatory compliance.

Variants

This product is offered in multiple amperage ratings so the breaker can be matched to the protected AC circuit and the conductor size used in the installation.

The actuator style, 2-pole layout, 240V AC maximum voltage, magnetic hydraulic trip-free design, terminal type, interrupt capacity, mounting hardware size, and operating temperature range are consistent across these listed configurations. The amperage rating is the selection point that changes between variants.

• 7461: 10A amperage. This lower-current option fits AC circuits with lighter loads where the circuit design calls for 10A protection.
• 7462: 15A amperage. This rating is commonly used where the protected AC branch circuit is sized for 15A service.
• 7463: 20A amperage. This option suits circuits that require 20A protection within a 2-pole, 240V AC breaker format.
• 7464: 25A amperage. This mid-range rating supports AC loads that fall between common 20A and 30A circuit requirements.
• 7465: 30A amperage. This is the highest amperage option in this listed group and is used where the circuit design calls for 30A 2-pole protection.

Installation and setup

Confirm the required amperage against the protected load, conductor size, and the vessel's AC panel design before installation. The terminal stud torque is 35 in-lb, and the mounting screw torque is 8 in-lb, so a torque driver is useful for a clean installation that avoids loose connections or over-tightened hardware.

This breaker is intended for protected panel mounting rather than direct exposure on deck. As with any marine AC work, installation should follow the vessel wiring plan and applicable marine electrical practices, with power isolated before wiring or servicing the panel.

Use cases on board

This breaker range is a good match for builders, refit yards, and boat owners working on AC distribution panels where a 2-pole 240V AC breaker is needed. It is especially relevant for commercial, Coast Guard, Navy, Army, or other regulated vessel applications where UL-489 circuit protection is part of the electrical specification.