42-Way Distribution Box

Overview

The NBX‑970 is the 42-circuit member of the NBX central distribution family — the natural fit for high-feature heavy-truck and large coach programs that don't quite need the 47-circuit headroom of the NBX‑953 but cannot live within the 32-circuit envelope of the NBX‑958.

Choosing the NBX‑970 in the central PDB family

The NBX central distribution family is laid out as a circuit-count ladder, and the NBX‑970 is the 42-circuit rung. Pick by where your harness lands:

• Circuit count. The NBX‑970's 42 circuits suit a high-feature heavy truck or large coach. If the harness fits inside 32 circuits, the NBX‑958 (32-way) is the smaller, lower-capacity box; if it runs into the high-40s, step up to the 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. The NBX‑957 is the workhorse body-central PDB quoted around a 36-fuse / 25-relay reference build; the numbered boxes (958 / 970 / 953 / 972) are the same body-central concept pinned to a specific circuit-count tier. Choose the NBX‑970 when the program has settled on roughly 42 circuits and wants that size fixed; choose the NBX‑957 when you want the general platform configured to the harness.
• Sealing and body-control logic. The NBX‑970 is IP54 for protected body-cavity placement. If the box must sit on the chassis rail or outdoors, choose the IP67 NBX‑971 instead; if 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 and the relay box vs fuse box vs junction box comparison.

Engineering details

Electrical specification: 9–32 VDC, −40 to +85 °C working range, configurable fuse + relay grid, reverse-polarity protection on the main power inputs. The mechanical envelope is optimised for body-cavity placement with serviceable fuse/relay access for field maintenance.

• 42 circuits — high-feature truck and coach harness coverage
• Modular fuse + relay layout, quoted to your harness
• Optional sealed connector exit for chassis-near placement
• Same IATF 16949 manufacturing process as the rest of the NBX series

Mechanical layout

Mating connectors

The standard NBX-970 build uses 11 harness-side 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-970 reference build covers the following 12 vehicle-electronics functions, sized for high-feature truck and large-coach 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. Validation in our in-house environmental lab with EMC pre-compliance equipment.

Related models & how to ask

Sister models in the NBX central PDB family: NBX‑958 (32-way), NBX‑953 (47-way), NBX‑972 (65-circuit) and the general-purpose NBX‑957 body central PDB. For sealed IP67 programs, see NBX‑971. Drawings welcome via the contact page.