Question 1

What are the core electrical parameters and power conversion efficiency metrics of the Delta ESR-48/56A D rectifier module?

Accepted Answer

The Delta ESR-48/56A D (SKU: DLT-REC-ESR4856A-56A) is an industrial-grade telecom switched-mode rectifier. It operates across an ultra-wide AC input range of 88VAC to 300VAC (nominal 220VAC) and delivers a full 3000W rated output power between 176VAC and 300VAC. The DC output is adjustable from -42VDC to -58VDC (nominal -48VDC) with a rated continuous current of 56A. Utilizing advanced soft-switching topology and digital signal control, it achieves a peak efficiency of ≥95%, a power factor (PF) ≥0.99, and THD ≤5%, substantially lowering site PUE and power dissipation across central offices and edge data centers.

Question 2

How does the ESR-48/56A D perform in terms of subrack hot-swap compatibility and active parallel load sharing?

Accepted Answer

The ESR-48/56A D supports hot-plug integration within standard 19-inch Delta telecom power subracks, engineered with rugged gold-plated blind-mate connectors and self-aligning guide rails. It interfaces seamlessly with Delta CSU/SMU supervisory units via CAN/RS485 bus protocol. Featuring autonomous digital active load sharing, current imbalance across parallel modules is maintained within ≤±5%. The unit offers backward compatibility within the Delta ESR ecosystem, allowing live insertion and withdrawal for N+1 or N+M redundant deployment with zero interruption to the critical -48VDC bus.

Question 3

What protective mechanisms and reliability designs does this module feature under extreme grid fluctuations and thermal conditions?

Accepted Answer

Engineered for harsh outdoor telecom cabinets and unstable grids, the ESR-48/56A D uses an internal intelligent variable-speed axial fan for forced-air cooling, supporting an operating temperature range of -40°C to +75°C (linear derating above +55°C) to optimize dust resilience and fan lifespan. Electrical protections include AC input over/under-voltage shutoff, DC output overvoltage clamp (OVP), output continuous short-circuit protection, over-temperature thermal rollback, and integrated surge withstand capability (2kV differential / 4kV common mode), verified with an MTBF of ≥350,000 hours.

Key specifications	Value
AC Input Voltage Range	88VAC ~ 300VAC (Nominal 220VAC)
Nominal DC Output Voltage	-42VDC ~ -58VDC (Nominal -48VDC)
Rated Output Current	56A
Rated Output Capacity	3000W
Power Conversion Efficiency	≥95%
Cooling Method	Built-in axial fan with intelligent temperature-controlled forced-air cooling

Delta ESR-48/56A D High Efficiency Telecom Rectifier Module -48V 56A 3000W

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

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