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Products · Power Distribution

Power Distribution Boxes for Commercial Vehicles & Machinery

Power distribution boxes, fuse boxes, relay boxes and sealed junction boxes for heavy trucks, buses, construction machinery and agricultural platforms. The Youlai NBX series covers 24+ models — from cabin fuse panels to fully sealed IP67 central distribution boxes — all built under one IATF 16949 OEM quality system.

Browse NBX families Contact Sales
Product families

Choose by box type

NBX models grouped by what the box does.

Central Power Distribution Boxes

Combined fuse, relay and distribution platforms in one housing — from the compact NBX-950 cabin unit up to 65-circuit whole-vehicle systems for heavy trucks, electric buses and large machinery, with optional on-board CAN body-control logic.

NBX-950 compact · NBX-957 · NBX-953 · NBX-958 · NBX-970 · NBX-971 · NBX-954 · NBX-952 CAN · NBX-972 65-way

Fuse Boxes & Battery-Fuse Modules

Blade-fuse panels for cabin and chassis circuits (ATO/ATC with mini-fuse and Bussmann options), plus bolt-on Littelfuse-style MEGA / MIDI modules for battery main-feed protection. Use the fuse box buyer guide to confirm circuit count, fuse type, connector choice and IP rating before RFQ.

NBX-955 12-way · NBX-981 15-way · NBX-2301 17-way · NBX-980 battery main-feed

Relay Boxes

Modular 6-channel relay switching for headlamps, wipers, fans, heaters and body actuators — reverse-polarity protection, ISO mini relay sockets.

NBX-2404 6-channel modular

Junction Boxes & Sealed Enclosures

Sealed and open-style junctions for harness consolidation, firewall pass-through, chassis-mount and outdoor placement on construction machinery and off-road equipment.

NBX-961 excavator · NBX-969 chassis · NBX-968 sealed · NBX-965 sealed junction · NBX-966 terminal block · NBX-962 / NBX-964 firewall junction · NBX-2055 base-section junction

Still choosing an architecture?

Fuse box, relay box, junction box or central power distribution box — which one?

A decision framework for OEM teams scoping a new commercial-vehicle program — how the four box types compare and where each NBX model fits.

Read the technical guide
~12 min · technical overview
Power Distribution — knowledge base

Choosing the right power distribution architecture

Buyer guides for the most common OEM power-distribution decisions.

Buyer Guide~10 min read

Commercial Vehicle Fuse Box: How to Choose for Trucks and Machinery

Circuit count, fuse standards, connector choice, IP rating and environmental class — a buyer guide for commercial-vehicle programs.

Read guide
Comparison~8 min read

Relay Box vs Fuse Box vs Junction Box: What's the Difference?

Architecture comparison, decision tree, integration patterns and OEM use cases — clear up which box does what.

Read guide
Engineering Notes~9 min read

Waterproof Central Distribution Box for Heavy Trucks (IP67)

What IP67 actually means in commercial-vehicle context, sealing techniques, and when to specify NBX-971 over a non-sealed alternative.

Read guide
Engineering Notes~9 min read

Excavator Power Distribution Box: OEM Solutions for Construction Machinery

Vibration class, dust/water sealing, CAN-bus harness compatibility (J1939 family typical) and the NBX-961 excavator integrated box as a reference design.

Read guide
Quality the OEM way

How we manufacture the NBX series

IATF

16949 Certified

OEM-grade quality system.

Read more →
EMC

In-house lab

Temperature, dust, salt-spray, ESD.

Read more →
IP65 / IP67

Sealed enclosures

For dust, water, off-road.

Read more →
SMT/THT

Auto production

3 SMT auto lines, 1 THT auto-flow line, 4 assembly.

Get in Touch

Talk to Our OEM Project Team

Reply within 24 hours (UTC+8). Send drawings or specifications via WhatsApp or email.

WhatsApp

+86 134 6767 4786
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Email

[email protected]
Send drawings & specifications

Phone

+86 134 6767 4786
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When reaching out, please share with us: target vehicle / machine model, expected annual volume, and key technical requirements (CAN protocol, IP rating, working temperature, connector preference). Drawings welcome.