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Blue Sea 250A 4x 5/16 Stud Busbar
Blue Sea 250A 4x 5/16 Stud Busbar
250A Continuous Rating - 4x 5/16" (Approx. M8) Stainless Steel Studs - Tin-Plated Copper Bus
Highlights:Terminal Studs: Four 5/16 inch-18 stainless steel studs for secure high-amperage connections,Tin-Plated Copper Bus: Highly conductive CDA 110 copper bus material with tin plating for corrosion resistance,Insulating Base: Reinforced thermoplastic base rated UL 94-V0 for safety and durability,Mounting Hole: Recessed mounting holes suitable for #10 or M5 hardware.
Key features: 250A continuous rating, Max voltage: 300V AC / 48V DC, Tin-plated copper bus material, UL 94-V0 rated base material.
Technical schematic showing overall length of 149mm, width of 38mm, and mounting centres at 133mm. 
Regular price
$68.00
Availability:
In Stock
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DESCRIPTION
Professional 250A Power Distribution for Marine and Automotive Systems
The Blue Sea 250A 4x 5/16 Stud Busbar is engineered to provide a robust and reliable central point for consolidating high-amperage wiring in demanding electrical setups. Designed for use in boats, caravans, RVs, and off-grid 4WD systems, this 250A busbar ensures efficient power distribution while maintaining a clean and organised installation. By collecting negative returns or positive feeds into one heavy-duty location, it significantly reduces cable clutter, improves system safety, and simplifies future troubleshooting.
Superior Materials for Harsh Environments
In the marine and automotive environment, corrosion and vibration are the enemies of reliable electrical connections. Unlike generic grade products that may utilise brass or lower-grade alloys, this Blue Sea busbar is constructed from Tin-Plated Copper CDA 110 / UNS 11000. This premium material choice delivers exceptional conductivity to minimise voltage drop, while the tin plating offers superior resistance to corrosion, even in salt-mist prone coastal areas.
The base is manufactured from UL 94-V0 rated glass-reinforced thermoplastic, ensuring high heat resistance and structural durability. This fire-retardant material provides peace of mind, knowing your electrical system is built on a foundation designed to withstand high temperatures and tough conditions.
Secure High-Torque Connections
A standout feature of this range is the design of the terminal studs. The 5/16"-18 (Approx. M8) stainless steel studs are insert-moulded directly into the base. This intelligent engineering eliminates the need for a securing nut at the back, allowing you to apply high torque to the terminals without the risk of the stud spinning or loosening over time. This ensures excellent electrical contact and secure retention of heavy-duty cable lugs.
Versatile Application and Safety
Whether you are designing a negative busbar return for a large battery bank or a positive distribution hub, this unit is rated for continuous currents up to 250 Amperes. It is also suitable for modern energy systems, supporting up to 48V DC and 300V AC, making it future-proof for lithium battery upgrades and higher voltage solar arrays.
The raised bus design allows for easy wrench access when attaching multiple large cables to a single stud. Additionally, the recessed mounting holes are designed to prevent accidental electrical shorts to metal mounting surfaces, such as aluminium boat hulls or steel vehicle chassis.
Compact at approximately 149mm in length, this 4-stud configuration is perfect for tight electrical lockers or smaller battery boxes where space is at a premium but high capacity is still required.
Key Features
- 250A Continuous Rating for heavy-duty power distribution
- Tin-Plated Copper Bus provides maximum conductivity and corrosion resistance
- 5/16"-18 (Approx. M8) Stainless Steel Studs allow for high-torque connections
- UL 94-V0 Rated Base resists high heat and fire
- Insert Moulded Studs eliminate the need for backing nuts
- Rated for 48V DC and 300V AC systems
- Recessed mounting holes preventing accidental shorts
Upgrade Your Electrical Safety
Ensure your electrical system is safe, efficient, and professional. Order the Blue Sea 250A 4x 5/16 Stud Busbar today to tidy up your wiring and ensure reliable power delivery for your next adventure.
SKU: BS-2127B
SPECIFICATIONS
Specifications
| Maximum Voltage |
300V AC 48V DC |
|---|---|
| Number of Terminal Studs | 4 |
| Terminal Type | 5/16"-18 Stud (approx. 7.94 mm diameter, 18 TPI ≈ 1.41 mm pitch; reference only) |
| Continuous Rating | 250A |
| Base Material | UL 94-V0 Rated, Glass Reinforced Thermoplastics |
| Bus Material | Tin-Plated Copper CDA 110 / UNS 11000 |
| Recommended Stud Torque |
132 in-lb (14.91 N·m) (approx. 11.0 ft-lb; reference only) |
| Weight (min / max) |
0.75–0.80 lb (0.34–0.36 kg) (approx. 340–360 g; reference only) |
| SKU: | BS-2127B |
| Barcode: | 632085021276 |
| Model #: | BS-2127B |
| MPN: | BS-2127B |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
