Overview
The NBX‑958 is the middle-tier central distribution box in the NBX power-distribution stack. Thirty-two individually protected circuits are enough for the body, cab, lighting and auxiliary load profile of a typical medium/heavy commercial-vehicle program — without paying for capacity the harness does not actually use.
Choosing the NBX‑958 in the central PDB family
The NBX‑958 is the entry rung of the numbered central-PDB ladder — the smallest full-size box that combines multi-circuit fusing and relay switching in one central enclosure. (Below it, the compact NBX‑950 covers cabin-cavity programs that need fewer circuits in a smaller housing.) Pick by where the harness lands:
- Stepping up from a fuse box. A pure fuse box like the NBX‑955 — with a separate NBX‑2404 relay box where switching is needed — covers programs whose BCM owns the switching or whose cab harness stays small. When the body harness instead needs multi-circuit fusing and relay switching consolidated in one full-size box, the NBX‑958's 32 circuits and 15-relay grid are the smallest numbered central PDB that does it. The relay vs fuse vs junction guide walks through that fuse-box-versus-central-PDB decision.
- Circuit count. 32 circuits suit a typical medium- or heavy-truck body harness. If the harness runs deeper, step up the ladder to the NBX‑970 (42-way) or NBX‑953 (47-way), and for the densest body harnesses the NBX‑972 (65-circuit) — a vented IP4x dry-zone high-density platform rather than an IP54 body-cavity box. Count the circuits, add 10–15% headroom and pick the next rung up rather than over-specifying.
- vs the general-purpose NBX‑957, sealing and CAN. The NBX‑957 is the workhorse body-central PDB configured to the harness rather than pinned to a fixed circuit count — choose the NBX‑958 when the program has settled on roughly 32 circuits and wants that size fixed. The NBX‑958 is IP54 for protected body-cavity placement; for chassis-rail or outdoor placement choose the IP67 NBX‑971, and where the program needs on-board CAN body-control logic rather than passive distribution, see the CAN-integrated NBX‑952.
For the upstream decision — whether the program needs a central PDB at all, versus separate fuse, relay and junction boxes — see the power distribution buyer guide.
Engineering details
Electrical specification mirrors the rest of the family: 9–32 VDC supply rail, −40 to +85 °C working range, ATO/ATC and mini-fuse mix, configurable relay matrix. Mechanical layout supports body-cavity installation with serviceable fuse/relay access.
- 32 circuits — sized for typical medium/heavy commercial-vehicle harness
- Configurable fuse and relay layout per program
- Reverse-polarity protection on the main power inputs
- Multi-OEM platform — proven across truck, bus and machinery programs
Mechanical layout
Mating connectors
The standard NBX-958 build uses 12 colour-keyed harness-side connectors from the DJB7-series of automotive sealed connectors (connector code J is intentionally DJ7023Y-9.5-21 per the manual). The colour code prevents harness mis-mating during service. Matching wire-side seal, terminal P/N and pin-out are confirmed against the customer harness drawing at quotation.
| ID | Connector P/N | Colour |
|---|---|---|
| A | DJB7081Y-6.3-21 | Yellow |
| B | DJB7082Y-6.3-21 | Yellow |
| C | DJB7101Y-3.5/6.3-21 | Blue |
| D | DJB7061Y-3.5/6.3-21 | Blue |
| E | DJB7102Y-3.5/6.3-21 | Blue |
| F | DJB7121Y-3.5/6.3-21 | Black |
| G | DJB7062Y-3.5/6.3-21 | Black |
| H | DJB7063Y-3.5/6.3-21 | Green |
| J | DJ7023Y-9.5-21 | Red |
| M | DJB7011Y-9.5-21 | Brown |
| N | DJB7013Y-9.5-21 | Yellow |
| P | DJB7012Y-9.5-21 | Red |
Fuse & relay configuration
Standard build, customised on a programme basis:
| # | Component | Spec | Qty |
|---|---|---|---|
| 1 | Relay | ISO mini relay | 15 |
| 2 | Fuse-removal tool | — | 1 |
| 3 | Fuse | ATO/ATC blade fuse | 32 |
| 4 | Fuse (spare) | ATO/ATC blade fuse | 10 |
| 5 | Optional add-ons | Wiper interrupt module, flasher relay | per programme |
| 6 | Function customisation | Per circuit-diagram changes (the internal busbar fixes some routes; please confirm changes with engineering) | — |
Built-in load functions
Programme-specific load mix — the NBX-958 reference build covers the following 12 vehicle-electronics functions, sized for medium- and heavy-commercial-vehicle harnesses:
- High & low-beam control
- Position / side-lamp control
- Fog-lamp control
- Turn-signal flasher control
- Wiper control
- Brake-lamp control
- Horn control
- Air-conditioning (HVAC) control
- Rear-lamp control
- Cooling-fan control
- Flasher control
- Tail-lamp control
Manufacturing & testing
Manufactured under IATF 16949 with full APQP/PPAP discipline. Validation in our in-house environmental lab.
Related models & how to ask
For the general-purpose body-central platform configured to your harness rather than a fixed circuit count, see the NBX‑957. For higher circuit count, consider NBX‑970 (42-way) or NBX‑953 (47-way); for a smaller program with switching handled separately, pair the NBX‑955 12-way fuse box with the NBX‑2404 relay box. Get drawings or quotes from the contact page.
