Overview
The NBX-980 is a main battery fuse / distribution module — the upstream block that turns the raw battery main feed into a set of individually fused, bolt-on outputs ready for the rest of the vehicle harness. It is the right specification when a program needs high-current main-feed protection with stud-style cable termination (10 mm² and above), not the low-current blade-fuse distribution that lives further downstream in a central PDB. The same housing supports both 12 V and 24 V architectures, with two independent main-input studs.
Engineering details
- Two independent main inputs — M8 stud for 24 V battery cable, M6 stud for 12 V battery cable; both rated for 10 mm² cable as the current production baseline
- 8 fuse positions on a single bolt-down rail — 6 protected outputs in current production plus 2 reserved positions for late additions
- Position 1 is a Littelfuse 298 MEGA block (bolt-down, 40 – 200 A range) for the highest-current branch (typical: controller-system master fuse or working-machine master fuse on construction equipment)
- Positions 2-8 are Littelfuse 498 MIDI blocks (bolt-down, 30 – 150 A range) for major downstream feeders — individual ratings specified per program against the customer wiring diagram
- OT ring-tongue terminal connection only — no blade-fuse holders, no relay sockets, no electronics
- IP53 sealed enclosure with separate top cover — serviceable in the field by lifting the cover and replacing bolt-down fuses with a wrench
- 9 – 36 VDC tolerance (covers 12 V, 24 V cold-crank and load-dump envelopes) — −30 to +85 °C working range
- Mechanical envelope 189 × 109 × 30.5 mm — Ø8 mm fixing holes; cable entry through 2×Ø14 main grommets plus 6×Ø10 branch grommets
How it differs from a blade-fuse box
The NBX-980 sits above a blade-fuse central PDB in the electrical architecture — not next to it. Pick the right block by the current level and the cable type at that point in the harness:
| Block | Where it sits | Fuse type | Typical per-circuit current |
|---|---|---|---|
| NBX-980 | Battery / main feed | Bolt-down MEGA + MIDI | 30 – 200 A |
| NBX-957 | Body central PDB (downstream) | Blade fuse + relay | 5 – 40 A |
| NBX-2301 | Body / accessory branch box | ATO/ATC blade | 5 – 30 A |
| NBX-955 | Light-commercial body box | ATO/ATC blade | 5 – 30 A |
For the architectural decision between main-feed bolt-down protection, blade-fuse boxes and relay-fuse central distribution, see the junction vs fuse vs relay box guide.
When a program needs the NBX‑980
Not every harness needs a dedicated main-feed block — a small program can run the battery feed straight into a central PDB’s own main input. The NBX‑980 earns its place when the main feed itself needs protecting and splitting before it reaches the distribution boxes:
- High-current, stud-terminated feeds. When the battery main-feed cables are 10 mm² and above and the major subsystems each want their own master fuse in the 30–200 A range, bolt-down MEGA / MIDI protection belongs upstream — the blade fuses in a downstream central PDB sit at 5–40 A and are the wrong tool for the trunk.
- Dual 12 V / 24 V battery architecture or several main branches. Two independent main-input studs and up to eight bolt-down positions let one block fuse the controller-system master, the working-machine master and the feeds to one or more downstream PDBs (NBX‑957 / NBX‑954 / NBX‑952) from a single point near the battery.
- Placement. The NBX‑980 is IP53 — dust-protected and sealed against angled spray, sized for a battery box, cab or protected engine-bay position rather than a fully exposed chassis-rail or wash-down location. See the IP protection notes for where each rating belongs.
Manufacturing & testing
Built under IATF 16949 with APQP project planning and a PPAP package available for OEM programs. Each unit is checked end-of-line for stud-torque conformity, cover-seal integrity and fuse-block continuity before packaging; environmental validation in our in-house lab when the program requires it.
Related models & how to ask
The NBX-980 is the upstream main-feed protection block; downstream models in the same lineup include the NBX-957 body central PDB, the NBX-954 central distribution box and the CAN-enabled NBX-952 centralized body control & PDB. For chassis-mount or outdoor placement that needs a sealed enclosure, the IP67 sealed central PDBs are covered in the IP67 waterproof PDB notes. For the full lineup, see the Power Distribution family. To request drawings, sample units or a quote against your harness, please use the contact page.
