Blue Sea 2303 Common 150A BusBar Four 1/4"-20 Studs

Consolidate and Distribute Power with Confidence

The Blue Sea 2303 Common BusBar is designed to simplify marine electrical installations by giving you a central point to consolidate multiple wires or feed multiple circuits. With four 1/4"-20 studs, it accommodates ring terminals and other standard connectors, making it straightforward to build a tidy, well-organised electrical panel. Whether you're running a positive DC distribution bus or collecting negative and AC ground circuits, the 2303 handles the job reliably.

Built for the Marine Environment

Marine electrical components face constant exposure to moisture, salt air, and vibration. Blue Sea Systems addresses these challenges with materials chosen specifically for longevity and performance aboard boats.

• Tin-plated copper bus (CDA 110 / UNS 11000) provides maximum conductivity while resisting corrosion from salt air and moisture
• Stainless steel studs and screws allow high torque values for secure, low-resistance electrical contact
• The stud design ensures direct terminal-to-bus contact, minimising voltage drop across connections

Versatile AC and DC Applications

The 2303 BusBar is rated for both AC and DC circuits, giving you flexibility in how you integrate it into your vessel's electrical system. On the DC side, it handles up to 150A continuous at voltages up to 48V DC — suitable for house battery distribution, charging systems, and accessory circuits. On the AC side, it supports 130A continuous at up to 300V AC, making it appropriate for shore power distribution and onboard generator circuits.

Safe, Heat-Resistant Base Material

Electrical connections generate heat, and in a confined engine room or electrical locker, that heat needs to be managed safely. The 2303's base is moulded from glass-reinforced thermoplastic that carries a UL 94-V0 rating, meaning it is self-extinguishing. This provides an important layer of fire safety in your boat's electrical system, particularly in areas where wiring is densely packed.

Simple Installation

Mounting the 2303 BusBar is straightforward. It secures to a flat surface using #10 screws, and its compact footprint makes it easy to fit into existing electrical panels or custom installations. The four studs accept standard ring terminals, and the recommended stud torque of 60 in-lb (6.78 Nm) ensures connections stay tight even under vibration. A dimensional drawing is available for download to help you plan your installation before drilling any holes.

Specifications

• Maximum Voltage (AC): 300V AC
• Maximum Voltage (DC): 48V DC
• Continuous Rating (AC): 130A AC
• Continuous Rating (DC): 150A DC
• Number of Terminal Studs: 4
• Terminal Type: 1/4"-20 Stud
• Bus Material: Tin-Plated Copper CDA 110 / UNS 11000
• Base Material: UL 94-V0 Rated, Glass Reinforced Thermoplastics
• Stud and Screw Material: Stainless Steel
• Stud Torque: 60 in-lb (6.78 Nm)
• Mounting Hardware: #10 Screws
• Weight: 0.35 lb (0.16 kg)
• MFG Part Number: 2303

Key Features 

• Four-stud common bus design — consolidate multiple wires or distribute power to several circuits from a single point
• Dual AC/DC capability — use for positive DC distribution, negative collection, or AC ground circuits without needing separate components
• Direct terminal-to-bus stud contact — minimises resistance and voltage drop for efficient power delivery
• Tin-plated copper construction — maximises conductivity while protecting against marine corrosion
• Stainless steel fasteners with high torque capacity — connections stay secure even under engine vibration and rough seas
• Self-extinguishing base material — adds a critical layer of fire safety in enclosed electrical compartments
• Compact four-stud footprint — fits easily into tight electrical panels and custom installations
• Simple #10 screw mounting — quick installation on bulkheads, panels, or mounting boards