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 individually fused circuits and a configurable 23-relay switching 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 fuse plan typically combines ATO/ATC mid-range blades for body and lighting, mini-fuses for low-current loads, and dedicated higher-current circuits for the cab supply, fan, heater and starter accessories. 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
• Optional sealed connector exit for chassis-near placement

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. The IP54 body-cavity siblings — NBX‑957, NBX‑958, NBX‑970 and the NBX‑953 itself — share the same 9–32 VDC rail and −40 to +85 °C range, so 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. A high-feature truck or coach harness that sits 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 IP54.

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, the sealed IP67 NBX‑971 is the equivalent platform. Send your harness drawing via the contact page.