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.
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 the published circuit step, fuse format by rail, housing-plus-gauge mix and IP class 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
NBX series — nineteen in-depth model pages
Compare circuit count, sealing level and box role. The selector also includes three catalog-listed junction variants for datasheet request.
Sourcing power distribution for a commercial-vehicle or machinery OEM program? See our power distribution manufacturer page for how Youlai builds fuse, relay, junction and sealed distribution boxes to your specifications.
Choosing the right power distribution architecture
Buyer guides for the most common OEM power-distribution decisions.
Commercial Vehicle Fuse Box: How to Choose for Trucks and Machinery
Which published circuit step to land on, the fuse format on each rail, and the terminal-gauge mix behind the connector housing.
Read guideRelay 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 guideWaterproof Central Distribution Box for Heavy Trucks (IP67)
How an IP67 chassis PDB is gasketed, vented and connector-sealed, and when to specify NBX-971 over a non-sealed alternative.
Read guideExcavator 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 guideHow we manufacture the NBX series
16949 Certified
OEM-grade quality system.
Read more →In-house lab
Temperature, dust, salt-spray, ESD.
Read more →Sealed enclosures
For dust, water, off-road.
Read more →Auto production
3 SMT auto lines, 1 THT auto-flow line, 4 assembly.
Talk to Our OEM Project Team
Typical reply within one business day. Send drawings or specifications via WhatsApp or email.