Overview
The NBX‑971 consolidates the vehicle's fuses, relays and load-feed circuits into one enclosure rated −40 to +85 °C and 9–32 VDC, so a single box serves both 12 V and 24 V architectures. Direct high-pressure wash-down is a separate test, confirmed per programme rather than assumed from this rating.
Most high-circuit NBX siblings — such as the NBX‑957, NBX‑953 and NBX‑958 — are selected primarily by circuit count and harness capacity, and are published at IP5X. The NBX‑970 is the 42-circuit step on that ladder, rated IP4X. The NBX‑971 is the one selected by where it mounts. The sealing approach is below.
When you need a sealed IP65 distribution box
IP65 is the specification for chassis-rail spray and wheel-thrown water. Standing water and fording call for IP67, a step above it. What the digits cover is on the IP ratings guide; how this chassis box is gasketed, vented and connector-sealed is in the sealing notes.
Where this sealed enclosure is not the requirement, size the next box by circuit count: NBX‑958, NBX‑970 or NBX‑953.
Engineering details
The IP65 rating depends on a coordinated set of design choices, not just a label: continuous gasket seal at the split-line, controlled compression, sealed automotive connectors at the harness exit — the standard build uses three Deutsch housings, with Bussmann, Tyco/AMP Superseal or Delphi GT specified where a programme already stocks them — and a semi-permeable vent membrane that equalises internal pressure across thermal cycling without admitting water. See our IP65 / IP67 protection page for the design rationale.
- IP65 — dust-tight and protected against water jets from a 6.3 mm nozzle
- Sealed automotive connectors with matched wire-side seals
- Pressure-equalising vent membrane for thermal-cycle robustness
- Same circuit-mapping flexibility as the body-mount NBX siblings
- Blown-fuse indication
- PCB-based circuit layout
Mechanical layout
Mating connectors
The standard NBX-971 build uses 3 sealed Deutsch harness-side connectors. Wire-side seals, terminal P/N and pin-out are confirmed against the customer harness drawing at quotation. Which half of each joint you are ordering, and why terminals and seals are quoted separately from the housing, is set out in the automotive connector guide.
| # | Description | Connector P/N | Brand |
|---|---|---|---|
| 1 | 12-pin connector (black) | DT06-12S | Deutsch |
| 2 | 12-pin connector (grey) | DT06-12S | Deutsch |
| 3 | 18-pin connector | HDP26-24-18PS | Deutsch |
Fuse & relay configuration
Standard build, customised on a programme basis:
| # | Component | Spec | Qty |
|---|---|---|---|
| 1 | Relay | ISO mini | 8 |
| 2 | Relay | ISO Micro | 2 |
| 3 | Fuse-removal tool | — | 1 |
| 4 | Fuse | ATO/ATC blade | 18 |
| 5 | Fuse (spare) | ATO/ATC blade | 3 |
| 6 | Optional add-ons | Wiper interrupt module, flasher relay | per programme |
| 7 | Function customisation | Per circuit-diagram changes | — |
Built-in load functions
Programme-specific load mix — the NBX-971 reference build covers the following 8 vehicle-electronics functions, sized for sealed body / chassis programmes including construction machinery:
- Engine kill / shutdown control
- Headlight control
- Boom-light control
- Horn control
- Wiper control
- Engine control
- Air-conditioning (HVAC) control
- Fuel-pump control
Manufacturing & testing
Manufactured under IATF 16949. PPAP deliverables and the submission level are agreed against the customer-specific requirements and the released drawing revision. IP testing follows IEC 60529 in our in-house environmental lab; reports are part of the program documentation.
Related models & how to ask
Sister models include the NBX‑961 excavator integrated box, also IP65, with a CAN harness pin-out, and the NBX‑968 sealed electrical box. NBX‑968 and NBX‑969 are IP54. For body-cavity programs, choose the NBX‑957. Send chassis drawings via the contact page.
