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.
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