Question 1

What are the core electrical input/output parameters and efficiency metrics of the Vertiv R48-2900U rectifier?

Accepted Answer

The Vertiv R48-2900U is engineered for high-availability telecom power architectures. It supports a wide single-phase AC input range of 85–290 V AC (full power delivery at 176–290 V AC, linear derating from 176 down to 85 V AC) with an input frequency of 45–65 Hz, active PFC ≥ 0.99, and THD ≤ 5%. It delivers a nominal -48 V DC output (adjustable from -42 V to -58 V DC), delivering up to 2900 W rated power and 50 A to 60.4 A continuous DC current depending on voltage setpoint. With a peak energy conversion efficiency exceeding 92%–93%, psophometric noise ≤ 2 mV, and peak-to-peak ripple ≤ 200 mV, it provides ultra-clean DC bus power ideal for sensitive 4G/5G RAN nodes and central office optical transmission hardware.

Question 2

Which subracks are compatible with R48-2900U, and does it support hot-swap and mixed-module current sharing?

Accepted Answer

Featuring a standard form factor of 132 × 85 × 287 mm, the R48-2900U is fully compatible with Vertiv/Emerson NetSure 501, NetSure 701, NetSure 502, NetSure 702 series power subracks and PS48-type power cabinets. It communicates natively via CAN bus with supervisory units including M500S, M522B, M830B, and NCU for true plug-and-play operation. The module supports live hot-swapping and active autonomous load sharing with a current-sharing unbalance of ≤ ±3%. While physically and functionally compatible for mixed deployment with high-efficiency counterparts (such as R48-2900e) during emergency field maintenance, pairing uniform rectifiers or applying controller-level group load balancing is recommended for optimal system efficiency.

Question 3

What environmental tolerance and hardware protection capabilities are engineered into the R48-2900U?

Accepted Answer

The R48-2900U is built to rugged carrier-grade specifications, operating within an extreme temperature envelope of -40 °C to +75 °C (delivering full 2900 W output up to +45 °C, with intelligent thermal derating up to +75 °C). Forced front-to-rear air cooling is driven by a variable-speed brushless DC fan that modulates based on thermal telemetry, minimizing particulate ingress and acoustic noise. Critical electrical protections include AC overvoltage shutoff (>290 V AC with auto-recovery hysteresis), input undervoltage protection, 2 kV differential / 4 kV common-mode surge immunity compliant with IEC 61000-4-5, output overvoltage latching, and continuous short-circuit protection, delivering an MTBF in excess of 400,000 hours.

Key specifications	Value
Nominal DC Output Voltage	-48 V DC
AC Input Voltage Range	85 ~ 290 V AC
Physical Dimensions Spec	132 × 85 × 287 mm
Operating Temperature	-40 ~ +75 °C

Vertiv Emerson R48-2900U Telecom Rectifier Module -48V 50A

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

4G/5G Wireless Macro Sites

Broadband Optical Access Nodes

Railway Signaling & Transit Comms

Utility & Substation DC Plants

Frequently asked questions

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