Q: What are the thermal management and electrical protection standards of the Flatpack S 48/1800 HE under harsh environmental and grid conditions?

The module operates across -40°C to +85°C ambient temperature. It delivers 100% full-load output from -40°C to +55°C, above which internal intelligent thermal derating manages safe operation up to +85°C shutdown. Cooling is driven by a variable-speed brushless DC fan with front-to-back airflow. Electrical protection includes surge immunity per IEC 61000-4-5 (2kV DM / 4kV CM), AC overvoltage sustain up to 300 VAC with automatic shutdown, DC short-circuit recovery, output OVP latching, and MTBF exceeding 350,000 hours (Telcordia SR-332).

Question 1

What are the core electrical specifications and input voltage derating characteristics of the Eltek Flatpack S 48/1800 HE (241122.125)?

Accepted Answer

The Eltek Flatpack S 48/1800 HE rectifier delivers a nominal -48V DC output (adjustable from 43.5 to 57.6 VDC) with a maximum power of 1800W and rated current of 37.5A under 185–275 VAC input. It achieves a peak efficiency of >95.5% (HE standard), with PF ≥ 0.99 and THD ≤ 5%. When AC input operates between 100 and 185 VAC, an internal linear derating profile protects the unit while sustaining continuous output (delivering approximately 900W / 18.75A at 100 VAC), ensuring uninterrupted DC operation for telecom loads under degraded grid conditions.

Question 2

Which chassis platforms are compatible with the Flatpack S 48/1800 HE, and how does it handle cabinet depth, expansion, and bus control?

Accepted Answer

Engineered for shallow-depth installations, the module features a 1U profile (41.5mm) and a compact 210mm depth, fitting ETSI 300mm cabinets and 1U/2U Flatpack S power shelves (e.g., 1U 2-slot, 3-slot, or 2U power core). It integrates an optically isolated digital CAN bus for plug-and-play communication with Smartpack S controllers. The unit supports true active N+1 autonomous current sharing (imbalance < ±5%) and single-handed hot-plugging, allowing seamless capacity expansion and field maintenance without system downtime.

Question 3

What are the thermal management and electrical protection standards of the Flatpack S 48/1800 HE under harsh environmental and grid conditions?

Accepted Answer

The module operates across -40°C to +85°C ambient temperature. It delivers 100% full-load output from -40°C to +55°C, above which internal intelligent thermal derating manages safe operation up to +85°C shutdown. Cooling is driven by a variable-speed brushless DC fan with front-to-back airflow. Electrical protection includes surge immunity per IEC 61000-4-5 (2kV DM / 4kV CM), AC overvoltage sustain up to 300 VAC with automatic shutdown, DC short-circuit recovery, output OVP latching, and MTBF exceeding 350,000 hours (Telcordia SR-332).

Key specifications	Value
AC Input Voltage Range	100 ~ 250 V AC
Physical Dimensions Spec	41.5 (1U) × 109 × 210 mm
Operating Temperature	-40 ~ +85 °C

Eltek Flatpack S 48/1800 HE High-Density Shallow Rectifier Module (Part No. 241122.125)

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What this product is

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5G small cell shallow cabinets

FTTx optical broadband power cabinets

Smart city surveillance equipment enclosures

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Eltek Flatpack S 48/1800 HE Telecom Rectifier Module 1800W -48V (241122.125)