Water-Resistant Circuit Breaker Switch Panel - Gray, 4 pos. + 12 Volt Socket and Dual USB Charger - Water-Resistant Circuit Breaker Switch Panel - Gray, 4 pos. + 12 Volt Socket and Dual USB Charger

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Save 27%

Blue Sea Systems

4321-BSS

Waterproof circuit breaker switch panel - Gray, 4 positions + 12 V socket and dual USB charger

Designed for exposed marine applications, the BLUE SEA 4321-BSS panel integrates four 15 A illuminated circuit breakers, a 12 V socket, and a dual USB 2.1 A charger. This gray panel, from the Blue Sea circuit breaker switch series, provides IP45 protection and a UV- and corrosion-resistant polycarbonate/ABS surface. Included: panel, 15 circuit labels, stainless steel mounting screws, and instructions.

Positions: 4

4 6

Equipment: 12 V + USB socket

Standard 12 V + USB socket

Retail priceBenefit from the professional rate

$78.52 USD

$78.52 USD ~~$107.80 USD~~

Shipping calculated at checkout.

In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Positions	4.0
Nominal voltage	12
Type de disjoncteur	Single-pole
Included Breakers	4.0
Rétroéclairé	Oui
Included Labels	15 square labels
Mounting type	Surface-mount installation
Panel Material	Polycarbonate/ABS
Dimensions (W x H x D)	119.38 x 169.67 x 68.83
Alarm output	false
Amperage	15
Couleur / finition	Gray
Breaker Type	Toggle circuit breaker
Certifications	IP45
Connector type	1/4" male quick-connect plug
Corrosion resistance	Yes
Compatible CZone	false
Support mise à jour firmware	false
Flame retardant	Yes
Joint d'étanchéité inclus	Yes
Protection anti-déflagrante	false
IP rating	IP45
Compatible MasterBus	false
Max Mounting Screw Torque	1.13 N·m (10 in·lb)
Max Terminal Stud Torque	2.25 N·m (20 in-lb)
Mounting Centers Height Mm	154.94
Mounting Centers Width Mm	104.90
Poles	1
Product use	Power distribution and circuit protection in exposed marine environments
Product type	Circuit breaker switch panel
Reset Type	Manual
Ring Terminal Size	#10 (5 mm)
Terminal Stud	M5 (#10) machine screw
Uv Resistant	Yes

Detailed description

Designed for power distribution in exposed marine environments, the BLUE SEA 4321-BSS water-resistant circuit breaker switch panel features four breaker positions with a 12 V socket and a dual USB charger. This gray model, with its polycarbonate/ABS surface, is UV-stabilized, flame-retardant, and corrosion-resistant, ensuring long-term durability.

Integrated Protection and Connectivity

The 4321-BSS panel operates at a nominal voltage of 12 V DC and supports a maximum continuous current of 45 A. Each circuit is protected by a 15 A illuminated breaker, providing a visual "ON" status indication and overcurrent protection. Unlike the 4320 or 4322 models in the same series, which are rated IP66, this specific panel (4321) has an IP45 front rating when mounted with its gasket, protecting against water jets. It is distinguished by the integration of a 12 V DC socket with a waterproof cap and a dual USB 2.1A charger with intelligent device recognition for fast charging.

Simplified Installation and Maintenance

Installation of the BLUE SEA 4321-BSS is simplified by industry-standard dimensions (169.67 mm height, 119.38 mm width, 68.83 mm depth) and a low profile, allowing easy mounting in confined spaces. The panel’s quick-connect breaker connectors (1/4" male quick connect) simplify wiring, and a simple two-wire connection with #10 (M5) ring terminals powers the entire panel. Silicone breaker boots and an EPDM gasket enhance protection against water infiltration. A set of 15 square circuit labels is included for clear identification, with additional labels available from Blue Sea Systems.

Documentation

Type	Nom
	EN - Wiring Schematic - Water-Resistant Circuit Breaker Switch Panel - Gray, 4 pos. + 12 Volt Socket and...
	EN - Sell Sheet - Water-Resistant Circuit Breaker Switch Panel - Gray, 4 pos. + 12 Volt Socket and...

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis: BLUE SEA 4321-BSS circuit breaker panel with USB charger »

The BLUE SEA 4321-BSS panel is a top choice for recreational boaters and professionals needing compact, multifunctional electrical management. Its practical value is particularly relevant for mid-sized vessels (RIBs, small sailboats, motorboats under 10–12 meters) where dashboard space is limited but connectivity demands are high. Integrating a 12V socket and dual USB charger into a single module eliminates the need for separate components, simplifying wiring and optimizing space. This feature gives it an edge over standard circuit-breaker panels without charging options.

Regarding installation, its standardized dimensions and low profile allow for flush or surface mounting, even in tight compartments. Quick-connect terminals are a significant advantage for retrofit installations or upgrades. It is important to note its IP45 rating on the front face, making it suitable for areas exposed to splashes and moderate water jets, such as an open helm station—but ensure the rear of the panel remains shielded from direct spray and immersion, unlike IP66 models that offer enhanced protection. This panel is ideal for powering essential equipment like navigation lights, bilge pumps, VHF, while also providing charging points for mobile devices, an increasingly common requirement aboard.

Durabilité

Facilité d'installation

Rapport performance / prix

Payment and security

Your payment information and data are processed securely.

Waterproof circuit breaker switch panel - Gray, 4 positions + 12 V socket and dual USB charger

$78.52 USD

$78.52 USD ~~$107.80 USD~~

Frequently Asked Questions

Need help? Contact us

What is the primary function of this circuit breaker panel?

The BLUE SEA 4321-BSS waterproof circuit breaker panel is designed for power distribution in exposed marine environments. It features four circuit breaker positions, a 12 V socket, and a dual USB charger for protecting and powering onboard electronic devices.

What is the IP rating of this panel?

The front face of panel 4321-BSS is rated IP45 when mounted with its gasket. This means it is protected against water jets.

What color is the circuit breaker panel?

The BLUE SEA 4321-BSS circuit breaker panel is grey.

How many circuit breaker positions does this panel offer?

This panel has four circuit breaker positions.

Does the panel include a 12 V socket?

Yes, the 4321-BSS panel includes a 12 V DC socket with a watertight cap.

Are the USB ports compatible with fast charging?

Yes, the panel is equipped with a dual USB charger at 2.1A with intelligent device recognition, enabling fast charging.

What is the maximum continuous DC current the panel can support?

The 4321-BSS panel can support a maximum continuous DC current of 45 A.

What is the material composition of the panel's surface?

The panel surface is made of polycarbonate/ABS. This material is UV-stabilized, flame-retardant, and corrosion-resistant, ensuring long-term durability.

Are the circuit breakers illuminated?

Yes, each circuit is protected by a 15 A illuminated circuit breaker, providing a visual indication of the "ON" state.

Is the panel supplied with circuit labels?

Yes, a set of 15 common square labels is included in the package and they are easy to replace.

What is the nominal operating voltage of this panel?

The nominal operating voltage of this panel is 12 V DC.

What are the physical dimensions of the panel?

The dimensions of the 4321-BSS panel are as follows:

Height: 169.67 mm (6.68 in)Width: 119.38 mm (4.70 in)Depth: 68.83 mm (2.71 in)

What are the dimensions of the mounting centers?

The mounting center dimensions are 104.90 mm (4.13 inches) in width and 154.94 mm (6.10 inches) in height.

What type of connectors are used for the positive loads of circuit breakers?

The 1/4" male quick-connect circuit breaker connectors are used for positive loads.

What ring terminal size is required for the wiring?

#10 (5 mm) ring terminals are required for the wiring.

What is the maximum torque for stud terminal lugs?

The recommended maximum torque for stud terminal lugs is 2.25 N·m (20 in-lb).

How to reset a circuit breaker on this panel?

To reset a circuit breaker, first push the switch to the "OFF" position, then push the switch to the "ON" position.

Is this panel suitable for use in an engine compartment?

No, it is specifically indicated not to install this panel where flammable vapors could accumulate, such as in an engine compartment or a propane locker.