What this page is
This is the direct factory contact page for buyers searching for a power distribution box manufacturer in China. It covers what we make, how we make it, who we make it for, and how to get drawings, samples and a quote moving within one business day.
The information below is the qualification pack we share with engineering teams specifying a cabin fuse box, a sealed chassis box or a whole-vehicle distribution box. For the engineering background — how those boxes are structured and how to write the specification — see the power distribution technical guide.
Who Youlai is
Changsha Youlai Electronic Technology Co., Ltd. is an IATF 16949 certified OEM electronics manufacturer based in Changsha, Hunan, China. We supply vehicle electronics — power distribution, body control, switching, sensors, displays — to commercial-vehicle and construction-machinery OEMs including SANY, XCMG, ZOOMLION, SINOTRUK, YUTONG and BYD. The full named list is on the About page.
The quality system is certified to IATF 16949. Environmental and OH&S system certificates (ISO 14001 / ISO 45001) are shared as current PDFs during qualification — see the OEM sourcing guide for what to verify.
What we make in Power Distribution
Each NBX model below has its own product page. Every one is a published platform we build to your OEM specification.
| Model | Type | Supply | Sealing | Layout |
|---|---|---|---|---|
| NBX‑950 | Compact central box | 9–32 VDC | IP65 | Compact circuit count, multi-fuse + relay |
| NBX‑957 | Body central box | 9–32 VDC | IP5X | Multi-relay + multi-fuse |
| NBX‑958 | 32-way distribution box | 9–32 VDC | IP5X | 32 circuits, multi-fuse + multi-relay |
| NBX‑970 | 42-way distribution box | 9–32 VDC | IP4X | 42 circuits; 11 harness-side connectors |
| NBX‑953 | 47-way distribution box | 9–32 VDC | IP5X | 47 ATO branches, 4 MAXI feeds, 23 relays |
| NBX‑972 | High-density central box | 9–32 VDC | IP4X, vented | 25 ISO relays, 65 fused positions; 9 connectors, ~148 pins |
| NBX‑954 | Passive central box | 9–32 VDC | IP65 | 12 ISO relays, 26 ATO fuses; 8 connectors, 106 pins |
| NBX‑952 | Central box with CAN body control | 9–32 VDC | IP65 | 12 ISO relays, 2 box + 28 mini-blade fuses; 7 connectors, 92 pins |
| NBX‑971 | Chassis central box | 9–32 VDC | IP65 | Multi-fuse + multi-relay; 3 Deutsch connectors |
| NBX‑961 | Excavator integrated box | 9–32 VDC | IP65 | 4 sealed TYCO connectors; CAN on the harness pin-out |
| NBX‑955 | 12-way fuse box | 12 V / 24 V | IP54 | 12 circuits, ATO/ATC; YAZAKI 7283-series connector |
| NBX‑981 | 15-way fuse box | 9–36 V | IP65 | 15 circuits |
| NBX‑2301 | 17-way fuse box | 9–32 VDC | IP54 | 17 ATO/ATC positions; optional relay sockets |
| NBX‑2404 | 6-channel relay box | 12 V / 24 V | IP54 | 6 relay channels, reverse-polarity protection |
| NBX‑965 | Sealed junction box | 9–32 VDC | IP65 | 2 harness inlets; terminal joining, no fuse or relay |
| NBX‑968 | Sealed electrical box | 9–32 VDC | IP54 | Fuse, relay or terminal contents, configurable |
| NBX‑969 | Chassis distribution box | 9–32 VDC | IP54 | 1 × 200 A, 2 × 100 A, 5 + 2 blade fuses |
| NBX‑980 | Main battery fuse module | 9–36 VDC | IP53 | M8 24 V + M6 12 V inputs; 6 bolt-on outputs, MEGA / MIDI fuses |
| NBX‑966 | Earth bonding plate | 9–32 VDC | IP5X | Common ground; 1 × 2-wire + 5 × 21-wire connectors |
The full Power Distribution catalogue is on the Power Distribution overview page.
Lines and test equipment
The Changsha factory runs three SMT lines (solder-paste print, SPI, JUKI placement, multi-zone reflow and AOI), one THT auto-flow line with wave soldering, and four assembly lines. Every assembly line ends in a functional test station. In-circuit testing is done on the ICT station. Annual capacity across the factory is 1.5 million sets. Where a power distribution box carries fuses or relays, an automatic inserter loads them.
These rigs belong to the Changsha lab, which validates models across the four product families.
| In-house rig | What it tests |
|---|---|
| Water-spray chamber | IPX water ingress |
| Dust chamber | IP5X / IP6X dust ingress |
| Salt-spray chamber | Accelerated corrosion |
| Temperature and humidity chamber | Programmable temperature and humidity profiling |
| Climate cycling chamber | Long-form humidity and temperature cycling |
| Thermal-shock chamber | Hot–cold step change |
| Aging chamber | Sustained burn-in at elevated temperature |
| Vibration and shock | Multi-axis vibration table; drop and bump |
| ESD generator | ESD immunity per IEC 61000-4-2 |
| ISO 7637 simulator | Supply-line transient immunity |
| Surge generator | Lightning surge immunity |
| Hipot tester | Dielectric withstand and insulation resistance |
| HIL simulation rig | Hardware-in-the-loop vehicle-network simulation |
In-house EMC work is pre-compliance. Formal EMC certification, when a programme requires it, is at accredited third-party laboratories. The quality page has photos of the lines and of the rigs it shows. Dust ingress, vibration and mechanical shock are described on the environmental and EMC page.
How a programme starts
- Briefing. These help if you already have them: target vehicle / machine model, expected annual volume, working voltage, IP rating, temperature range, the vibration profile at the mounting point, communication protocol (CAN 2.0 / CAN-FD / J1939) and connector preference.
- Selection or custom. We propose the closest standard NBX model. If your program needs a different circuit count, layout, fuse mix or sealing, we quote a custom variant on the same NBX platform. Where the requirement does not map onto any existing platform, we scope it as a new design instead of forcing a fit.
- Sample & validation. Engineering samples within 2–4 weeks for standard variants. Validation supported by our in-house environmental lab + EMC pre-compliance.
- Mass production. On the lines above, with in-process inspection and traceable batch records.
- Documentation. Drawing package, BOM, IATF documentation, IP test reports. Region-specific approvals (e-Mark / ECE, SASO, FCC) available upon project requirement.
Why programmes pick this supplier
- Engineering-led, not catalogue-only. Every NBX model is a project we own end-to-end, from PCB design through harness validation. Custom variants are routine, not an exception.
- Full product family coverage. Buyers consolidating the harness side of a program get power distribution, BCM/VCU/PMU/T-BOX, switches and sensors, displays and HUD from one supplier — see the four product families.
- OEM track record. Delivery against commercial-vehicle and construction-machinery OEM programmes, under one IATF 16949 quality system.
- Direct contact. Sales mobile +86 134 6767 4786, also on WhatsApp.
Get a quote moving
Email sales@yltronics.com or message us on WhatsApp. Drawings or a power-distribution specification help if you already have them. Typical reply within one business day. NDA on request.