Q: Which power shelf platforms support the Flatpack S 48/1000 HE, and how do active load sharing and hot-swapping operate in parallel configurations?

With an ultra-short depth of only 210mm, the Flatpack S 48/1000 HE fits Eltek 1U/2U Flatpack S subracks (such as 1U 2-position, 1U 3-position shelves, and Power Core systems), making it ideal for shallow 300mm outdoor telecommunication enclosures. Communication is driven via CAN bus directly to Smartpack S or Smartpack Touch supervisory units. The unit incorporates active digital current sharing with parallel unbalance < 5% across multiple rectifiers. It supports true live hot-swapping via high-reliability blind-mate rear connectors with first-mate last-break grounding, allowing smooth integration alongside Flatpack S 48/1800 HE units under automated controller load management.

Q: What reliability engineering and environmental protections does the Flatpack S 48/1000 HE feature for harsh thermal and unstable grid conditions?

The module operates from -40°C to +75°C (-40°F to +167°F), delivering 100% nominal power up to +55°C before initiating graceful thermal derating up to its +75°C shutdown threshold. Internal forced convection cooling is handled by a front-to-back variable-speed fan linked to ambient and internal temperature sensors. Electrical resilience includes built-in MOVs and filters compliant with IEC 61000-4-5 surge immunity (2kV differential / 4kV common mode) and Telcordia Class B EMI. Protective circuitry integrates AC overvoltage cutoff (withstanding sustained 305VAC and transient 415VAC swells), hardware DC Overvoltage Protection (OVP) latching, short-circuit current limit, and Over Temperature Protection (OTP), achieving an MTBF exceeding 350,000 hours (Telcordia SR-332).

Question 1

What are the core electrical parameters and efficiency ratings of the Eltek Flatpack S 48/1000 HE, and how does it derate under low AC input voltages?

Accepted Answer

The Eltek Flatpack S 48/1000 HE (SKU: ELTEK-REC-FPS-1000-HE) delivers a nominal -48VDC output (adjustable from -43.5 to -57.6 VDC) with a rated current of 20.8A and 1000W continuous output. It achieves peak conversion efficiency of 95.5% (HE standard), a power factor > 0.99, and THD < 5%. The AC input spans 85 to 305 VAC (45–66 Hz). Operating characteristics include full 1000W output delivery within 176–305 VAC, and progressive linear derating when input drops between 85 and 176 VAC (derating to approximately 450W–500W at 85 VAC) to prevent AC-side overcurrent tripping while maintaining non-stop DC bus availability.

Question 2

Which power shelf platforms support the Flatpack S 48/1000 HE, and how do active load sharing and hot-swapping operate in parallel configurations?

Accepted Answer

With an ultra-short depth of only 210mm, the Flatpack S 48/1000 HE fits Eltek 1U/2U Flatpack S subracks (such as 1U 2-position, 1U 3-position shelves, and Power Core systems), making it ideal for shallow 300mm outdoor telecommunication enclosures. Communication is driven via CAN bus directly to Smartpack S or Smartpack Touch supervisory units. The unit incorporates active digital current sharing with parallel unbalance < 5% across multiple rectifiers. It supports true live hot-swapping via high-reliability blind-mate rear connectors with first-mate last-break grounding, allowing smooth integration alongside Flatpack S 48/1800 HE units under automated controller load management.

Question 3

What reliability engineering and environmental protections does the Flatpack S 48/1000 HE feature for harsh thermal and unstable grid conditions?

Accepted Answer

The module operates from -40°C to +75°C (-40°F to +167°F), delivering 100% nominal power up to +55°C before initiating graceful thermal derating up to its +75°C shutdown threshold. Internal forced convection cooling is handled by a front-to-back variable-speed fan linked to ambient and internal temperature sensors. Electrical resilience includes built-in MOVs and filters compliant with IEC 61000-4-5 surge immunity (2kV differential / 4kV common mode) and Telcordia Class B EMI. Protective circuitry integrates AC overvoltage cutoff (withstanding sustained 305VAC and transient 415VAC swells), hardware DC Overvoltage Protection (OVP) latching, short-circuit current limit, and Over Temperature Protection (OTP), achieving an MTBF exceeding 350,000 hours (Telcordia SR-332).

Key specifications	Value
Rated Output Power	1000 W
Nominal Output Voltage	-48 VDC
Rated Output Current	20.8 A
Output Voltage Range	-43.5 ~ -57.6 VDC
AC Input Voltage Range	85 ~ 305 VAC
Power Conversion Efficiency	95.5% (HE high efficiency)
Output Power Factor PF	> 0.99
Physical Dimensions Spec	41.5 × 72 × 210 mm (ultra-short chassis depth, suitable for shallow cabinets)
Operating Temperature	-40°C ~ +85°C

Eltek Flatpack S 48/1000 HE Ultra-Compact High Efficiency Rectifier Module (-48V 20A 1000W)

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5G shallow cabinet access nodes

FTTx optical fiber network nodes

Smart city surveillance pole enclosures

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