1. Core Electrical Specifications and Topology Architecture
The Huawei R4875G1 is an ultra-high-density, single-phase AC-to-DC digital power rectifier engineered for 5G telecom stations and dense data center infrastructure. Operating under a nominal input of 200VAC to 240VAC, a single unit delivers up to 4000W with a nominal output current of 75A (peak capability up to 83.3A). The peak power conversion efficiency reaches 96.5%, meeting international telecom gold-standard efficiency benchmarks.
The module features an ultra-wide AC input operating window spanning 85VAC to 300VAC. Between 85VAC and 176VAC, the integrated digital signal processor (DSP) executes a seamless linear derating algorithm to maintain uninterrupted bus power during severe utility grid brownouts. The unit provides 300VAC overvoltage withstand capability and 3000VAC input-to-ground dielectric isolation. Its DC output is adjustable between -42VDC and -58VDC, catering precisely to float and equalization charge profiles for VRLA and LiFePO4 battery banks.
Nominal Ratings: Single-phase 200-240VAC input, -48VDC/75A nominal output, 4000W power capacity
Wide Input Tolerance: 85VAC to 300VAC operational window with linear derating below 176VAC
High Conversion Efficiency: Peak efficiency greater than or equal to 96.5%, Power Factor (PF) >= 0.99, THD <= 5%
Thermal and Acoustic Design: Intelligent dual-fan forced cooling, variable speed control, acoustic noise <= 55 dBA at 25C
2. Subrack Chassis and Supervisory Monitoring Compatibility Matrix
Before procuring R4875G1 modules for capacity expansion, telecom engineers must verify the continuous current rating of the subrack chassis backplane connectors and internal DC busbars. Because each R4875G1 delivers 75A, thermal dissipation and contact current density significantly exceed legacy 50A units such as R4850G2.
The R4875G1 natively integrates into medium-to-large capacity subracks including Huawei ETP48300-C9A1, ETP48400 series, ETP48600, as well as integrated outdoor power shelters like the MTS9606B and MTS9000. On the control layer, the system requires supervisory monitoring units equipped with modern firmware (such as SMU02B or SMU02C). These controllers communicate over an isolated CAN bus to handle automatic slot addressing, dynamic master-slave active current sharing, and multi-stage battery temperature compensation. Installing R4875G1 units into low-ampacity 1U subracks without busbar rating evaluation risks severe contact overtemperature.
Recommended Subrack Chassis: Huawei ETP48300-C9A1, ETP48400, ETP48600, MTS9600 series enclosures
Chassis Restrictions: Avoid unverified deployment in low-capacity 1U/2U subracks such as early ETP4890
Supervisory Unit Compatibility: Fully matched with SMU02B / SMU02C controllers via isolated CAN bus
Scalable Parallel Operation: Supports up to 8 to 12 modules in parallel within a single cabinet up to 900A total
3. Retrofit Strategies and Capacity Expansion from Legacy Units
In brownfield telecom modernization projects, deploying the R4875G1 to replace aging R4850G2, R4850N1, or R4830G1 rectifiers is an established high-density upgrade path. Stepping up from 50A to 75A per module provides a 50% increase in slot power density, instantly accommodating demanding 5G Active Antenna Units (AAUs) and edge compute nodes without footprint expansion.
A successful retrofit requires engineering validation across three primary areas: first, AC upstream circuit protection must be re-evaluated; existing 32A single-phase branch breakers may reach thermal trip thresholds under full 4000W load, necessitating an upgrade to 40A or 63A motor-rated MCBs. Second, the DC distribution cables and busbar temperature rise must remain below 30K under continuous 75A flow. Third, battery recharge limits must be reprogrammed within the SMU interface to reflect proper C-rate charging rules.
Per-Slot Power Multiplication: Delivers 75A in the same 1U modular form factor formerly occupied by 50A units
AC Breaker Sizing: Upstream AC breakers must be resized to 40A or 63A to handle 4000W full-load draw
DC Cabling and Bus Verification: Ensure output power wiring meets 25mm2 to 35mm2 cross-sectional temperature standards
Monitoring Parameters: Update rectifier profiles and battery charge current limits within the SMU supervisor
4. Procurement Risk Mitigation, Authenticity Inspection, and Testing Protocols
Due to high commercial demand, the secondary and refurbished telecom market contains remarked labels, resprayed chassis, and units with compromised internal components. Procuring reliable hardware requires a systematic technical inspection protocol.
First, verify that the laser-etched matrix barcode on the chassis matches the silk-screened serial label, cross-referencing serial numbers against manufacturer batch records. Second, inspect the rear blind-mate edge connectors for gold-plating wear; genuine unissued units exhibit clean, uniform gold deposition without insertion gouges or oxidation. Third, inspect internal filtering capacitors through ventilation slots; authentic industrial units employ 105C long-life Japanese electrolytics (such as Nippon Chemi-Con or Rubycon). Finally, mandate a rigorous 4-hour burn-in acceptance test on an active load bank at 53.5V/75A, verifying output ripple voltage below 200mVp-p.
Barcode Traceability: Laser-etched chassis codes and adhesive labels must correlate with motherboard serials
Connector Integrity: Rear gold-finger contacts and alignment pins must show zero arc burns or re-soldering
Component Quality: Internal topology must feature original 105C industrial-grade electrolytic capacitors
Active Burn-In Verification: Require certified full-load burn-in test reports with voltage regulation within +/-0.5%
5. RICEWIND Global Inventory and Engineering Support
As an international specialist in telecom power infrastructure and critical hardware supply, RICEWIND maintains extensive inventory of factory-new and rigorously tested Huawei R4875G1, R4850G2, ETP48300, Vertiv NetSure, and ZTE ZXDU systems. We provide telecommunications operators, contractors, and critical data centers worldwide with competitive pricing and immediate dispatch capabilities.
Every unit dispatched undergoes 100% active electronic load testing and dielectric isolation verification, backed by warranty coverage. For datasheets, bulk price quotations, or technical retrofit support, contact our engineering team directly at lee@ricewind.com or telephone/WhatsApp: +86 17621197907.
Comprehensive Ready Stock: Broad inventory covering Huawei, Vertiv, ZTE, and Delta telecom power modules
Rigorous QA Protocols: Every unit is 100% full-load bench-tested prior to export packaging
Fast International Logistics: Air and ocean freight dispatch tailored for mission-critical project timelines
Direct Engineering Contact: Inquiries and technical support via lee@ricewind.com or +86 17621197907
Engineering Procurement & Technical Desk
For technical datasheets, custom power topology design, or volume export quotations, reach out to HEFENGQI engineers.
