Overview
The NBX‑969 is a chassis-mount distribution box for heavy-truck and bus chassis applications. It sits on the rail rather than in the body cavity, which means the enclosure is sealed and the harness exit is engineered for chassis routing — gland seals, sealed connectors, route protection.
Engineering details
Electrical: 9–32 VDC, −40 to +85 °C working range, IP65 sealing, configurable fuse and relay layout per program. Connector spec is quoted to your harness drawing.
- IP65 sealed for chassis-rail placement
- Sealed connectors and gland-style harness exits
- Configurable circuit map and connector pin-out
- Same IATF process as the rest of NBX
Mechanical layout
Fuse & relay configuration
Standard build, customised on a programme basis:
| # | Component | Spec | Qty |
|---|---|---|---|
| 1 | Main contactor | 200 A (high-current main contactor / solenoid-driven main switch — not an ISO automotive micro-relay) | 1 |
| 2 | High-current contactor | 100 A (chassis-side high-current contactor) | 2 |
| 3 | Fuse | Flat-blade type | 5 |
| 4 | Fuse (spare) | Flat-blade type | 2 |
Note: the 200 A / 100 A entries are high-current contactors (or solenoid-driven main switches) sized for the chassis-side master-switch / pre-heat duty, not ISO automotive micro-relays. Exact part numbers are quoted against the programme BOM.
Built-in load functions
Programme-specific load mix — the NBX-969 reference build covers the following 5 chassis-side power-management functions:
- Master-switch control
- Pre-heat control
- Starting control
- Battery protection
- Alternator protection
Choosing the NBX‑969: chassis-rail distribution, body-cavity PDB, or a configurable sealed box
The NBX‑969 is selected first by where the distribution sits and how wet that position gets. On the chassis rail — exposed to road spray and water jets, but not immersion or fording — its IP65 sealing, sealed connectors and gland-style exits are the match. If the box instead lives in the dry body cavity, the IP54 NBX‑957 body central PDB is the right platform; if the position can see fording or standing water, step up to the IP67 NBX‑971.
Among the IP65 chassis enclosures, the NBX‑969 and the NBX‑968 sealed electrical box overlap on sealing but differ in intent. The NBX‑969 is a chassis distribution box: its reference build is a defined chassis-side power-management set — master-switch, pre-heat, starting, and battery / alternator protection — around high-current main and chassis contactors. The NBX‑968 is the broader configurable sealed box, whose contents (fuse, relay, terminal blocks or any combination) are quoted to the program. Choose the NBX‑969 when you want a chassis-rail distribution box with that standard power-management function set; choose the NBX‑968 when the point is really a configurable sealed node whose internals you define.
Manufacturing & testing
Manufactured under IATF 16949. Validation in our in-house environmental lab with EMC pre-compliance equipment with documented IP test reports.
Related models & how to ask
If your program needs IP67 (immersion) rather than IP65 (water jets), see NBX‑971. For body-cavity placement on heavy trucks, see NBX‑957. Discussion via the contact page.
