Product Introduction
Brand background: The TH48T75NZ-S series rectifier modules are manufactured by Shijiazhuang Tonhe Electronics Technology Co., Ltd. (Tonhe Technology, listed on the Shenzhen Stock Exchange ChiNext Board, stock code 300491). Founded in 1998, Tonhe is one of China's first power-electronics companies to industrialize "full soft-switching" power conversion technology, holding 280+ patents and investing about 10% of its operating revenue in R&D. The company serves five business segments — new-energy vehicles, smart grid, aerospace, thermal management, and energy storage — and exports to more than 30 countries, making it a leading domestic manufacturer of telecom power and power-electronics solutions.
Product positioning: The TH48T75NZ-S is a 1U-high, 4000W, 48V-class high-efficiency digital rectifier module. In the model name, "48" denotes a 48V DC system and "75" denotes a 75A rated output current (53.5V × 75A ≈ 4000W). The module converts 85–300 VAC mains into a regulated –42 V to –58 V DC output, achieves a peak conversion efficiency of 97%, and supports online hot-swapping, parallel current sharing, and remote intelligent monitoring. Built on the industry-standard 4875 platform, it is ideal for 48V DC power supply in 5G base stations, telecom central offices, data centers, access networks, and enterprise communication networks.
Product Specifications
General
| Item | Specification | Note |
|---|---|---|
| Model | TH48T75NZ-S | Per nameplate |
| Rated power | 4000 W | |
| Output voltage / current | 53.5V DC (rated) / 75A | Default voltage per nameplate |
| Dimensions (H × W × D) | 40.8 × 105 × 269 mm (1U) | Per nameplate |
| Weight | ≤ 2.2 kg | Per nameplate |
| Cooling | Built-in fan, auto speed regulation | |
| Protection rating | IP20 | Per nameplate |
Input characteristics
| Item | Specification |
|---|---|
| Input voltage range | 85–300 V AC |
| Input frequency | 45–66 Hz (rated 50/60 Hz) |
| Rated input current | < 21 A |
| Power factor | ≥ 0.99 (50%–100% load) |
| Total harmonic distortion (THD) | ≤ 5% (50%–100% load) |
| Standby power consumption | ≤ 5 W |
Output characteristics
| Item | Specification |
|---|---|
| Output voltage range | 42–58 V DC (adjustable via controller) |
| Output power | 4000 W (176–300 V AC input); linear derating to 1600 W at 85–175 V AC input |
| Peak efficiency | 97% ± 0.2% (≥ 96% @ 230 V AC, 30%–80% load) |
| Voltage regulation accuracy | ≤ ±0.6% × Vo |
| Ripple and noise | ≤ 200 mVp-p (bandwidth ≤ 20 MHz) |
| Dynamic response | 25%–50% / 50%–75% load steps: overshoot ≤ ±5%, recovery < 200 μs |
| Telephone weighted noise | ≤ 2 mV |
| Output hold time | > 10 ms |
Environment & reliability
| Item | Specification | |
|---|---|---|
| Operating temperature | -40°C to +75°C | |
| Storage temperature | -40°C to +75°C | |
| Relative humidity | 5%–95% (non-condensing) | |
| Altitude | ≤ 5000 m (above 2000 m, derate 1°C per 200 m) | |
| Certifications | TUV, CE, UL, FCC, CB; RoHS compliant | △ Per nameplate/certificates |
Features
| Item | Description |
|---|---|
| Communication | CAN / RS485, fully digital control △ Protocol per nameplate |
| Hot-swap | Supported; online replacement without downtime; soft start |
| Current sharing | Automatic load sharing in parallel; voltage and current limit adjustment |
| Alarms | LED alarm indication, remote reporting |
| Protection | Input over/under-voltage, output over-voltage, over-current, short-circuit, over-temperature |
Key Advantages
1. Reliable domestic brand: Tonhe is a publicly listed company (300491.SZ) with 20+ years of power-electronics R&D and manufacturing experience, proprietary full soft-switching technology, and factory-backed after-sales support.
2. 97% peak efficiency — long-term savings: Compared with conventional modules at 90% efficiency, each 4000W unit at full load saves about 0.32 kWh per hour, i.e., roughly 2,810 kWh per unit per year (8760 h full load), significantly cutting operating electricity costs.
3. Ultra-wide input 85–300 V AC: Handles unstable and remote-area grids; full 4000W output above 176 V, linear derating to 1600 W at low voltage to keep stations online under weak grids.
4. High power density — 4000W in 1U: Compact and lightweight (≤ 2.2 kg), saving rack space and supporting high-density deployment and easy capacity expansion.
5. Wide operating temperature -40°C to +75°C: Suitable for outdoor cabinets, tower base stations, and unattended sites.
6. Hot-swap + parallel current sharing: Maintenance and expansion without power interruption; N+1 redundancy improves system availability.
7. Grid friendly: Power factor ≥ 0.99 and THD ≤ 5% minimize harmonic pollution and grid-governance costs.
8. Fully digital smart management: CAN/RS485 communication, smart metering, remote voltage/current adjustment, real-time monitoring and O&M via the system controller.
FAQ
Q1: What does "4875" mean? What is the output specification?
"48" means a 48V DC system, and "75" means a 75A rated output current. The rated output voltage is 53.5V DC (adjustable 42–58V DC); at 75A full load the output power is 4000W.
Q2: What is the input voltage range? What happens when the grid voltage is low?
The input range is 85–300 V AC (45–66 Hz), compatible with both 110V and 220V grids. At 176–300 V AC input the module delivers the full 4000W; at 85–175 V AC the output is linearly derated (down to 1600W), so the system keeps powering the load under severe voltage fluctuation instead of shutting down.
Q3: How efficient is it? How much power can it save?
Peak efficiency is 97% ± 0.2%, with ≥ 96% over the typical 30%–80% load range at 230 V AC. At 4000W full load, comparing 97% vs. 90% efficiency, the module consumes about 0.32 kWh less per hour — roughly 2,810 kWh saved per unit per year at continuous full load.
Q4: Does it support hot-swapping and parallel operation? Is it compatible with mainstream systems?
Yes. The module supports online hot-swapping (system replacement without power interruption), soft start, automatic fault isolation, and parallel operation with automatic current sharing for N+1 redundancy. Built on the standard 4875 1U platform, its form factor and connectors are interchangeable with R4875G1/G5-class modules. When integrated into a third-party rack, however, communication protocol, default output voltage, and monitoring compatibility should be verified against the nameplate and the system controller.
Q5: What is needed for installation? What should be noted for use and after-sales?
The module installs into a standard 19-inch rack / embedded power shelf and connects to the power supply system monitoring unit via CAN/RS485 for monitoring, voltage/current adjustment, and alarm reporting. Size the number of parallel modules per system capacity and configure DC distribution and battery backup accordingly. Keep air intake/exhaust unobstructed and protect against dust; input is high voltage, so wiring must be done by qualified personnel per the nameplate ratings with proper insulation. Retain the factory certificate and serial number — contact Tonhe or authorized channels for warranty claims.
