NBX-953 47-Way Electrical Distribution Box

Overview

The NBX‑953 is sized for full-feature heavy-truck platforms — 6×4 and 8×4 tractor chassis, dump trucks, mixers and large logistics platforms — where the harness has to support a deep mix of cab, body, lighting, beacon, auxiliary and trailer-pre-feed circuits. With 47 ATO branch positions, 4 MAXI feeds and a 23-relay grid, the NBX‑953 acts as a single integration point for the body harness instead of distributing the function across multiple smaller boxes.

Engineering details

Electrically the NBX‑953 runs on 9–32 VDC with a −40 to +85 °C working range. The relay grid is configurable per program.

• 47 circuits — enough headroom for the deep harness profile of full-feature heavy trucks
• Modular fuse and relay grid; circuit map quoted to your specific harness drawing
• Configurable rail layout for split-feed (B+ / ignition / accessory) architectures

Mechanical layout

Mating connectors

The standard NBX-953 build uses 18 harness-side connectors from the DJ7-series of generic automotive blade connectors. Programme-specific terminal P/N, wire-side seal and harness colour code are confirmed against the customer harness drawing at quotation.

Fuse & relay configuration

Standard build, customised on a programme basis:

Built-in load functions

Programme-specific load mix — the NBX-953 reference build covers the following 19 vehicle-electronics functions, consistent with full-feature heavy-truck and dump/mixer/tractor programmes:

• Ignition control
• 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
• Retarder control
• Reverse-lamp control
• Rear-lamp control
• Diagnostic interface
• Parking-brake control
• Idle-speed control
• ECU “ignition-on” supply control
• Cooling-fan control
• Tipping / lift control
• After-treatment heater control

Manufacturing & testing

Built under IATF 16949 with the same APQP / PPAP discipline as the rest of the NBX series. Programme validation runs in our in-house environmental lab — temperature cycling, vibration and EMC pre-compliance, with salt-spray and other environmental screens added per program.

Choosing the NBX‑953 in the high-circuit NBX family

The NBX‑953 sits at the high-circuit end of the body-central NBX family. It is published at IP5X, as are the NBX‑957 and the NBX‑958. The NBX‑970 is the 42-circuit step at IP4X. All four share the 9–32 VDC rail and −40 to +85 °C working range. The choice among them is mostly circuit count: how deep the body, cab, lighting and auxiliary harness actually runs. The NBX‑953 earns its 47 circuits on full-feature platforms; specifying it for a harness that only fills thirty lines pays for headroom the program never uses.

• NBX‑957 — general-purpose body central. The default body-central box (reference build 36 fused circuits) when circuit count is not what drives the program.
• NBX‑958 — 32 circuits. A medium/heavy harness that needs more than a fuse box but not 40-plus circuits.
• NBX‑970 — 42 circuits. The step between the NBX‑958 and the NBX‑953.
• NBX‑953 — 47 circuits. Full-feature 6×4 / 8×4 tractors, dump trucks and mixers where the body harness is deep enough to justify 40-plus fused circuits and a dedicated relay grid in one box.
• NBX‑972 — 65 circuits. When even 47 circuits run out: a high-density passive block for the heaviest diesel and machinery programs, in a vented IP4X dry-zone enclosure rather than IP5X.

For the buyer-side method behind sizing circuit count, fuse type and connector choice — the decisions upstream of which box you pick — see the commercial vehicle fuse box buyer guide. If the box must sit outside the protected body cavity, use the IP65 NBX‑971. That is a different box, not a sealed option of this one. Send your harness drawing via the contact page.