Question 1

What are the core electrical performance parameters, AC input tolerance, and output capacity of the Eltek Compact CT0S system?

Accepted Answer

The Eltek Compact CT0S (SKU: ELTEK-SYS-CT0S-0201) is engineered for 19-inch 2U shallow-depth (250mm) telecom enclosures. Equipped with 4 slots for Flatpack2 48/2000 or 48/3000 HE rectifiers, it delivers a total system capacity of up to 150A–200A (8kW to 12kW peak DC output). The system accommodates an ultra-wide AC input range of 85VAC to 300VAC (full power at 185–275VAC, with linear derating from 185VAC down to 85VAC), maintaining an active Power Factor (PF) ≥ 0.99 and THD ≤ 5%. Its nominal -48V DC output is software-adjustable between -43.5V and -57.6V DC. Delivering peak power conversion efficiency up to 96.5% with Flatpack2 HE modules, voltage regulation accuracy within ±0.5%, and peak-to-peak ripple noise below 100mVp-p, the CT0S satisfies rigorous power density and power quality standards for Tier-3 data sites and 5G base stations.

Question 2

How does the CT0S chassis handle rectifier slot compatibility, digital current sharing, and topology integration with Smartpack controllers?

Accepted Answer

The CT0S subrack offers extensive multi-generation module compatibility. Its 4 rectifier slots support the entire Flatpack2 48V family (Standard, HE, SHE, and DC/DC converters) with full live hot-swap capabilities without system interruption. Autonomous digital active load sharing is achieved over an isolated high-speed CAN bus, limiting current deviation to less than ±5% across modules with autonomous fail-safe operation if communication drops. The platform integrates seamlessly with Smartpack S or Smartpack2 controllers, providing native SNMP v1/v2c/v3, Modbus TCP/RTU, and an embedded WebGUI. It enables precise battery charging/discharging algorithms, temperature compensation (-0.072V/°C), programmable dry contact alarm mappings, and remote non-disruptive firmware deployments.

Question 3

What thermal design, surge protection, and Low Voltage Disconnect (LVD) safeguards are implemented in the Compact CT0S for harsh site environments?

Accepted Answer

Engineered for harsh telecom shelters and outdoor cabinets, the Compact CT0S operates across an ambient range of -40°C to +65°C (with intelligent derating up to +75°C absolute limit). The chassis features dedicated aerodynamic airflow paths, complemented by the rectifiers' integrated speed-controlled brushless fans with dust-resistant coatings and auto-recovery thermal shutdown. The AC distribution accommodates Class C / Type 2 Surge Protective Devices (SPD, In 20kA, Imax 40kA 8/20µs). For DC protection, it incorporates dual-level Low Voltage Disconnect architecture (configurable LVBD for battery isolation and LVBL for non-critical load shedding) using high-capacity magnetic latching contactors, physically isolating power circuits at programmable thresholds (e.g., 43.2V / 45.0V DC) to prevent catastrophic battery over-discharge and preserve mission-critical radio carriers.

Key specifications	Value
AC Input Voltage Range	85VAC ~ 300VAC VAC
Nominal DC Output Voltage	-48 V DC
System Output Capacity	A
Rectifier Module Slots	4 × Flatpack2 48/2000 or 48/3000 Slots
Physical Dimensions Spec	88 (2U) × 482 × 250 mm (shallow depth)
System Monitoring Controller	Smartpack S / Smartpack2

Eltek Compact CT0S Embedded Telecom DC Power System Subrack -48V 100A/150A

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