Q: What reliability and environmental protection features allow the R48-3500e3 to operate in extreme industrial and harsh grid environments?

Engineered for harsh deployments, the R48-3500e3 operates across -40°C to +75°C. It maintains 100% full-load delivery from -40°C to +55°C, transitioning into smooth thermal derating between +55°C and +75°C. Cooling is handled by an intelligent speed-controlled brushless DC fan driven by real-time multi-point thermal sensing, maximizing fan service life and minimizing acoustic noise. Electrically, it incorporates robust lightning surge withstand (4kV common mode / 2kV differential mode), auto-recovery AC over/undervoltage shutdown, dual hardware output OVP latching, short-circuit hiccup protection, and over-temperature safety, achieving an MTBF exceeding 450,000 hours.

Question 1

What are the core electrical specifications and efficiency metrics of the Vertiv R48-3500e3, and what is its derating behavior under low AC input voltages?

Accepted Answer

The Vertiv R48-3500e3 is a high-power-density digital rectifier module delivering a nominal -48VDC output at 70A with a rated capacity of 3500W. It provides an adjustable DC output range of -42 to -58 VDC, achieves a peak efficiency of 96.2% (e3 ultra-high efficiency class), and maintains a power factor ≥0.99 with THD ≤5%. Featuring a wide input range of 85 to 300 VAC, it supports full 3500W output between 176 and 300 VAC. In the 85 to 175 VAC window, an intelligent linear derating profile is activated (delivering ~1500W output at 85 VAC), preventing grid/generator undervoltage tripping while sustaining telecom operational continuity.

Question 2

Which Vertiv NetSure power subracks support the R48-3500e3, can it be mixed with legacy rectifiers, and how does its current-sharing operate?

Accepted Answer

The R48-3500e3 utilizes a standard 1U form factor and is natively compatible with Vertiv NetSure 531, NetSure 731, and NetSure 801 series subracks, as well as various embedded telecom power enclosures. It features high-speed CAN bus communication for plug-and-play synchronization with M830B, M820D, and NCU supervisory controllers. For brownfield retrofits, it is mechanically backward-compatible. When mixed with legacy standard-efficiency units (e.g., R48-3200 or base R48-3500), autonomous active current sharing is maintained within <±5% imbalance via controller arbitration; however, grouping identical e3 modules within the same shelf is strongly recommended to utilize advanced eco-mode sleep scheduling.

Question 3

What reliability and environmental protection features allow the R48-3500e3 to operate in extreme industrial and harsh grid environments?

Accepted Answer

Engineered for harsh deployments, the R48-3500e3 operates across -40°C to +75°C. It maintains 100% full-load delivery from -40°C to +55°C, transitioning into smooth thermal derating between +55°C and +75°C. Cooling is handled by an intelligent speed-controlled brushless DC fan driven by real-time multi-point thermal sensing, maximizing fan service life and minimizing acoustic noise. Electrically, it incorporates robust lightning surge withstand (4kV common mode / 2kV differential mode), auto-recovery AC over/undervoltage shutdown, dual hardware output OVP latching, short-circuit hiccup protection, and over-temperature safety, achieving an MTBF exceeding 450,000 hours.

Key specifications	Value
Output Voltage Range	-42 ~ -58 VDC
AC Input Voltage Range	85 ~ 300 VAC
Output Power Factor PF	≥0.99
Operating Temperature	-40 ~ +75 ℃
Cooling Method	Built-in fan-forced air cooling (with temperature-controlled speed regulation)
Nominal DC Output Voltage	-48 V DC
AC Input Voltage Range	85 ~ 300 V AC
Physical Dimensions Spec	41.5 (1U) × 109 × 281 mm
Operating Temperature	-40 ~ +75 °C

Vertiv R48-3500E3 High Efficiency Telecom Rectifier Module -48V 70A 3500W

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What this product is

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5G Wireless Macro Base Stations

Core Optical Fiber Transmission Hubs

Data Center High-Density DC Plants

Railway Traction Signaling Power Enclosures

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