2pcs 4 Stud Busbar Bus Bar Power Distribution M8 M10 Battery Terminal Distribution Block Marine Bus Bar, Automotive 12V 250A
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SKU: 14:10#M8
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4-Post Power Distribution Block (M8/M10) — 48V DC, 250A Bus Bar
Overview
High-current DC power distribution block with four threaded studs (M8/M10) for centralized termination and distribution of multiple conductors in 12–48 V DC systems. Engineered for automotive, RV, and marine electrical architectures where low resistance, mechanical robustness, and serviceability are required.
Technical Specifications
| Housing Material | ABS (reinforced, flame-retardant, impact-resistant) |
|---|---|
| Conductive Element | Nickel-plated brass bus plate (uniform current distribution, corrosion resistance) |
| Hardware | Stainless steel / zinc alloy fasteners and washers |
| Main Studs | 4 posts — M8 / M10 threaded options |
| Auxiliary Terminals | Low-current screw terminals for accessory circuits (20 A each) |
| Maximum System Voltage | 48 V DC |
| Rated Current (per stud) | 62.5 A |
| Rated Current (bus total) | 250 A continuous (aggregate) |
| Dimensions | 170 × 44 × 33 mm (6.69 × 1.73 × 1.30 in) |
| Unit Weight | ~500 g |
| Color Options | Black / Red |
| External Certification | CE |
| Package | Neutral carton |
| Special Function | Centralizes and secures harness terminations; reduces wiring clutter; improves service access |
| Scope of Use | Automotive, RV, marine/boat/yacht DC systems; off-grid inverter/charger banks; industrial DC panels |
Design & Performance Notes
- Thermal management: Brass bus distributes current to minimize localized heating; nickel plating mitigates oxidation in humid/salt environments.
- Mechanical integrity: Stainless/zinc hardware maintains clamp load under vibration and thermal cycling; ABS enclosure resists impact and deformation.
- Serviceability: Four discrete studs segment source/loads (e.g., battery, inverter, DC-DC, auxiliary) for organized maintenance and fault isolation.
Installation Guidelines
- Size cable lugs to M8/M10 stud diameter; ensure flat washer, lock washer, and nut stack provides full thread engagement.
- Torque to manufacturer-appropriate values (typ. 8–15 N·m for M8; 20–35 N·m for M10 unless otherwise specified).
- Observe 62.5 A per-stud and 250 A aggregate limits; apply diversity factors when paralleling loads.
- Route conductors to maintain bend radius; provide strain relief; segregate high-current cables from signal wiring.
- For marine use, apply dielectric grease or protective coating on exposed threads; follow ABYC/NMEA best practices as applicable.
Package Contents
- 1 × 4-Post Power Distribution Block (M8/M10 variant selected)
- Mounting and fastening hardware (as supplied)
- Neutral carton
FAQs
- Can I mix M8 and M10 lugs on the same block?
- Use lugs that match the stud size installed on the block. Do not oversize or drill out lugs; select the correct variant (M8 or M10) to maintain contact area and clamp load.
- What cable sizes are compatible?
- Compatibility is determined by the lug you crimp to the cable and the stud size. Typical high-current DC installations use 6 AWG to 2/0 AWG depending on current. Verify ampacity and lug barrel size per conductor.
- Is the 250 A rating continuous?
- Yes, the 250 A is the continuous aggregate rating for the bus under normal ambient conditions. For elevated ambient temperatures or enclosed spaces, derate accordingly.
- What is the maximum system voltage?
- 48 V DC. Do not use on AC mains or systems exceeding 48 V DC nominal.
- Can I use it as a negative (ground) bus?
- Yes. The block is non-polarized and can be used for positive distribution or as a return/ground bus, provided ratings are observed.
- Are auxiliary screws isolated from the main studs?
- No. Auxiliary screws are bonded to the main bus and intended for low-current branches (≤20 A each). Protect each branch with appropriate overcurrent devices.
- Does it include covers or boots?
- Supplied hardware may vary. If a terminal cover is not included, add an insulated cover or boot to comply with your installation standards and to prevent accidental contact.
Related terms: 4 post busbar, battery junction block, DC distribution block, inverter bus, RV marine power stud block, M8 M10 distribution stud.
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