DaierTek Car Terminal Block Negative Bus Bar 12V 150A Terminal Block 12V Power Distribution Block M8 Termianl Bus for Automotive
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SKU: 14:200004889#2PCS 6XM6
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Negative Bus Bar — 12–48 V DC, up to 150 A DC (BB150 Family)
Overview
Heavy-duty negative bus bar / power distribution block for centralized grounding and return-path consolidation in low-voltage DC systems. The BB150 family uses a high-conductivity copper bar, stainless hardware, and a protective cover that permits 180° wire-lug entry. Designed for automotive, RV, and marine electrical architectures operating at 12–48 V DC.
Technical Specifications
| Product Type | Negative bus bar / power distribution block |
|---|---|
| Model Family | BB150 |
| Conductor | Copper bus bar |
| Housing / Cover | Plastic (impact-resistant), rounded-corner base; clear cover with wide-open area for 180° lug installation |
| Primary Studs | M6 or M8 (variant-dependent); stainless hardware |
| Accessory Screws | M4 (#8) terminals for low-current branches (count per variant) |
| DC Voltage Rating | 48 V DC (max) |
| AC Voltage Rating | 300 V AC (max) |
| Continuous Current | Up to 150 A DC (max); 130 A AC (max) |
| Catalog Rated Current | 120 A (nominal rating noted in some listings; observe thermal derating) |
| External Certification | CE |
| Environmental | Corrosion-resistant hardware; suitable for automotive/marine environments |
| Color Options | Black / Red |
| Use Cases | Automotive, RV, marine/boat, auxiliary battery systems, inverter/charger returns, chassis ground consolidation |
| Materials (bill-of-materials) | Copper bus; stainless/zinc-alloy fasteners; plastic base/cover |
Available Variants (Terminal Configuration)
| Variant | Studs | Accessory Screws | Notes |
|---|---|---|---|
| BB150-2M6-12M4 | 2 × M6 (¼″) | 12 × M4 (#8) | Compact dual-stud with high accessory density |
| BB150-4M8-6M4 | 4 × M8 (5/16″) | 6 × M4 (#8) | Higher current branches; moderate accessory count |
| BB150-5M8 | 5 × M8 (5/16″) | — | Multi-branch high-current returns |
| BB150-6M6 | 6 × M6 (¼″) | — | More medium-current return points |
| BB150-6M8 | 6 × M8 (5/16″) | — | Maximum M8 density for large lugs |
| BB150-7M6 | 7 × M6 (¼″) | — | Highest M6 branch count |
Design & Performance Notes
- Open-area cover: Clear cover geometry supports straight-in, side, or reversed lug approaches (≤180°), easing cable routing in tight bays.
- Rounded base: Reduces snag points and distributes stress on mounting surfaces; better fit near harness radii.
- Thermal behavior: Copper bus provides low resistive loss; select stud size and branch count to keep temperature rise within limits.
- Fastener stack-up: Special-design nuts/washers improve clamp retention and vibration resistance.
Installation Guidelines
- Match lug hole to stud size (M6 or M8). Do not ream lugs; use correct hardware to maintain contact area.
- Typical torque: M6 ≈ 5–9 N·m; M8 ≈ 12–20 N·m (use manufacturer-approved values for your hardware).
- Respect current limits: up to 150 A DC continuous (family max), or 130 A AC; apply derating for elevated ambient and enclosure effects.
- Route conductors to maintain bend radius; provide strain relief; segregate signal and high-current wiring.
- For marine use, apply dielectric grease to exposed threads; follow ABYC/NMEA best practices.
FAQs
- Is this only for 12 V systems?
- No. The family supports 12–48 V DC (rated 48 V DC max). It also carries up to 300 V AC per listing; observe creepage/clearance and enclosure requirements.
- Which variant should I choose—M6 or M8?
- Use M8 for larger lugs and higher branch currents (e.g., inverter returns). Use M6 for medium-current circuits and tighter packing density.
- What does the 120 A vs. 150 A rating mean?
- Some catalogs list a nominal 120 A rating. The family maximum continuous rating is 150 A DC under standard ambient conditions. Derate as necessary for temperature and enclosure.
- Can I use it as a positive bus?
- Yes. Electrically the bar is non-polarized. Ensure you provide adequate touch-safe protection and color coding when used on the positive rail.
- Does the cover limit lug orientation?
- No. The cover’s open area permits 180° lug installation (straight, angled, or reversed) to support varied cable approaches.
- Are the M4 accessory screws isolated?
- No. M4 terminals are bonded to the main bus and intended for low-current branches or sensor/common returns. Protect each branch with appropriate overcurrent devices.
Related terms: car terminal block, marine ground bus bar, 12V negative busbar, 48V return bus, BB150 bus bar M8, BB150 bus bar M6.
Why Pros Buy Direct from Conversions Tech
Engineered in the USA. Our U.S.-based engineering team designs and specifies our core product lines, and every product we carry — designed in-house or built to our exact specifications by certified partner factories — is quality-verified before it ships. UL/CSA listed where required, NEC compliant.
Cross-reference savings. Direct equivalents to Burndy, Hubbell, and other OEM part numbers at up to 30% less — same specs, same certifications, without the big-brand markup.
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