Question 1

What are the core electrical performance specifications and power derating characteristics of the Huawei R4875G1 rectifier module?

Accepted Answer

The Huawei R4875G1 (SKU: HW-REC-R4875G1-75A) delivers a rated output of 4000W with a peak efficiency of 96.5% (rated efficiency ≥96%). It supports an ultra-wide AC input range of 85VAC to 300VAC. Full 4000W rated capacity (nominal -48VDC, 75A rated, up to 83.3A maximum output) is maintained within 176VAC to 300VAC high-line input. When input voltage drops between 85VAC and 175VAC, the module initiates linear power derating (derating to approximately 40% capacity at 85VAC). The DC output voltage is adjustable from -42VDC to -58VDC with voltage stabilization accuracy ≤±0.5%, total harmonic distortion (THD) ≤5%, and power factor (PF) ≥0.99, minimizing power distribution losses in high-density telecom rooms and data center facilities.

Question 2

Which Huawei power subracks are compatible with the R4875G1, and does it support hot-plugging or mixed operation with legacy R4850G modules?

Accepted Answer

The R4875G1 is designed for Huawei ETP48400, ETP48600 high-capacity indoor/outdoor DC power systems, and select APM30H base station subracks. Featuring a standard 1U hot-swappable blind-mate interface, it communicates via CAN bus with site controllers (e.g., SMU02B, SMU02C) and employs autonomous active load-sharing technology, keeping current imbalance within ±5% across parallel modules. Regarding mixed usage: while physical slot dimensions match older modules like R4850G1 (50A/3000W), mixing 75A and 50A modules in the same shelf is not recommended by Huawei engineering guidelines due to distinct power curves and regulation steps, which may cause premature current limiting on smaller modules. Upgrading entire subracks uniformly is strongly recommended for high-reliability deployments.

Question 3

What hardware reliability and environmental tolerance features are engineered into the R4875G1 for unstable grids and harsh conditions?

Accepted Answer

The R4875G1 is built to endure harsh commercial grids and extreme climates, operating across an ambient temperature range of -40°C to +75°C (100% continuous output from -40°C to +45°C, with smart thermal derating up to +75°C). Cooling is managed by dual brushless DC fans featuring step-less temperature-controlled air speed based on internal thermal sensors, significantly prolonging fan life and reducing acoustic noise. For electrical surge tolerance, the module integrates built-in surge protection of 2kV differential mode / 4kV common mode on the AC side and can withstand sustained overvoltage up to 415VAC without catastrophic failure. Rated with an MTBF exceeding 500,000 hours, it complies with CE, UL, TÜV, and IEC 60950-1 telecom-grade safety and EMC standards.

Key specifications	Value
AC Input Voltage Range	85VAC ~ 300VAC (Nominal 200~240VAC)
Nominal DC Output Voltage	-42VDC ~ -58VDC (Nominal -48VDC)
Rated Output Current	75A (maximum 83.3A)
Rated Output Capacity	4000W (high-voltage input mode)
Power Conversion Efficiency	≥96% (up to 96.5%)
Cooling Method	Forced-air cooling with intelligent temperature control and dual fans

Huawei R4875G1 High Power Telecom Rectifier Module -48V 75A 4000W

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Telecom macro and indoor distribution sites

Edge computing and aggregation facilities

Railway transport and industrial command centers

Frequently asked questions

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