Question 1

What are the core electrical performance, output capacity, and energy conversion efficiency specs of the Huawei ETP48400-C3B1?

Accepted Answer

The Huawei ETP48400-C3B1 features a high-density 3U subrack (482.6mm W x 330mm D x 133.5mm H) supporting an ultra-wide AC input range of 85V to 300V AC (compatible with single-phase and three-phase grids). Equipped with up to 8 rectifier slots, it delivers a nominal -48V DC output with a maximum system capacity of 400A (up to 24kW total power). When populated with R4850G2 or R4875G1 rectifiers, peak conversion efficiency exceeds 96%, with a power factor (PF) ≥ 0.99 and THD ≤ 5%. The system achieves 100% full-power output within 176V~300V AC, providing precision voltage regulation and current limiting engineered for high-density 5G and core telecom sites.

Question 2

Does the ETP48400-C3B1 support mixed installation of R4850G2 and R4875G1 rectifiers, and how do current sharing and monitoring work?

Accepted Answer

The ETP48400-C3B1 supports standard Huawei 50A and 75A rectifiers (including R4850G2, R4850N2, and R4875G1). It allows hot-plugging and seamless modular scaling with active autonomous current-sharing imbalance maintained under ±5%. The integrated SMU02C advanced monitoring unit communicates with rectifiers via internal CAN bus for dynamic voltage, current, and thermal control. For northbound network integration, it offers RS485, FE Ethernet, SNMPv3, Modbus, and Huawei NetEco cloud integration, alongside customizable dry contacts (DI/DO) for external genset interlock and environmental telemetry.

Question 3

What reliability designs, surge protection, and DC disconnection mechanisms protect the ETP48400-C3B1 against harsh grids and extreme conditions?

Accepted Answer

The ETP48400-C3B1 operates across -40°C to +75°C (with linear derating above 55°C), utilizing intelligent temperature-controlled fans and dedicated dust-isolated airflow channels. AC input incorporates a heavy-duty 20kA/40kA (8/20μs) surge protection device (SPD), complemented by a 10kA/20kA DC surge protection rating. The DC distribution incorporates a two-stage disconnect architecture: intelligent LLVD (Load Low Voltage Disconnect) and BLVD (Battery Low Voltage Disconnect). Upon grid failure, LLVD sheds non-critical branches first to sustain mission-critical loads, while BLVD isolates the battery string before deep-discharge damage occurs.

Key specifications	Value
Monitoring Controller Unit	SMU02C intelligent network management and monitoring module
DC Distribution Branches	Two-stage distribution: LLVD load disconnect + BLVD battery protection
AC Input Voltage Range	85V~300V AC (3-Phase / 1-Phase Compatible)
Physical Dimensions Spec	482.6mm (W) x 330mm (D) x 133.5mm (3U H)
System Output Capacity	400A (-48V DC)
Rectifier Module Slots	8 slots (supports mixed installation of R4850G2 / R4875G1)

Huawei ETP48400-C3B1 3U Subrack Embedded Telecom DC Power System -48V 400A

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