Flatpack S Compact Modular DC Power Systems
Flatpack S is a family of compact modular 24 V / 36 V / 48 V DC power systems for telecom and industrial sites where rack space, shallow installation depth, and flexible expansion matter. It fits especially well in access networks, radio sites, FTTx cabinets, broadband infrastructure, industrial control environments, and retrofit projects where a smaller footprint is important.
Built around hot-pluggable Flatpack S rectifiers and typically paired with Smartpack S control, the platform is designed for compact rack and cabinet integration, straightforward monitoring, and scalable growth without moving into a much larger DC system architecture. Typical system configurations are in the 1–9 kW range, depending on shelf, rectifier, voltage, and redundancy arrangement. Product variants include 1U, 2U, stand-alone, and other compact implementations.
Compact modular design for space-limited DC installations
Flatpack S is built for telecom and industrial DC sites where space, service access, and modular growth all matter.
Compact high power density
Delivers up to 9 kW in a shallow, space-efficient system format.
Hot-pluggable system elements
Rectifiers, controllers, and pluggable protection elements are designed for fast field service.
Integrated control architecture
Typically paired with Smartpack S and aligned with the wider Delta / Eltek control ecosystem.
For specialized applications
Also suitable for project-specific configurations, including marine and other demanding environments.
System versions and deployment formats
Flatpack S is available in several system formats for different installation methods, voltage architectures, and distribution needs. This section outlines the main version types within the platform, from compact 1U and 2U systems to bulk-feed, shelf-based, stand-alone, and wall-mounted configurations, showing how the same core architecture is adapted to different technical environments.
Flatpack S 1U systems
The Flatpack S 1U system is a compact 48 V DC platform for telecom and network sites where shallow depth, front access, and integrated distribution are important. It combines rectifiers, Smartpack S control, battery distribution, and load distribution in a single 1U format with 262 mm depth. The system is available in 2R and 3R versions, where 2R means two rectifier positions and 3R means three rectifier positions, giving different capacity levels within the same compact mechanical concept.
The two versions serve different load ranges within the same 1U platform. The 2R system uses 1000 W rectifier modules only and is better suited to smaller loads where compact integration is the main priority. The 3R system supports both 1000 W and 1800 W rectifier modules, which gives more flexibility for higher output, redundancy planning, and future growth. This makes the 1U platform suitable for a wide range of compact telecom applications without changing the overall installation format.
Flatpack S 1U Bulk Feed system
The Flatpack S 1U Bulk Feed system is a compact DC platform for external distribution applications where flexible outputs, shallow depth, and modular deployment are important. It is available in 48 V, 36 V, and 24 V versions and uses a 3R 1U format with Smartpack S control, hot-pluggable rectifiers, and optional LVBD. Its 262 mm depth makes it suitable for cabinet replacements and other installations where space is limited but output flexibility is still required.
This version is aimed at telecom and industrial environments that need bulk DC outputs rather than integrated branch protection in the same way as more distribution-focused system variants. Official material highlights use in mobile, wireless, fixed-line, offshore, marine, and process industry applications. Output arrangements include multiple polarity and voltage options, with either direct bulk outputs or a combination of direct and LVBD-controlled outputs. That makes it a practical choice where compact size and adaptable external distribution matter more than a more integrated load-distribution approach.
Flatpack S 1U power shelves
The Flatpack S 1U power shelves are compact integration platforms for building larger or more customized DC systems around the Flatpack S rectifier family. Unlike the more self-contained 1U systems, these shelves are intended as power-building blocks inside a wider system design. They support 24 V and 48 V architectures, hot-pluggable rectifiers, 270 mm installation depth, and flush or mid-mount installation, making them suitable where flexible expansion and system-level integration matter more than an all-in-one compact configuration.
These shelves are designed for telecom, industrial, railway, offshore, and process-industry applications where the DC system is assembled around external distribution, control, or site-specific architecture. There are C+5R and 6R versions compatible with Flatpack S rectifiers across 24 V and 48 V system designs. In practice, they fit projects that need a compact rectifier shelf with broad integration flexibility rather than a more predefined system layout with integrated distribution and fixed internal structure.
Flatpack S 2U power system
The Flatpack S 2U power system is a compact 48 V DC platform for telecom and network installations that need more integrated distribution and current capacity than the 1U range. It combines Smartpack S control, hot-pluggable rectifiers, battery distribution, load distribution, and front-access MCB connections in a shallow 270 mm 2U format. This makes it well suited to cabinet replacements, space-constrained upgrades, and other compact DC deployments where flexibility and service access are both important.
The 2U system is designed around pluggable breakers and rectifiers, which allows practical field configuration within the same compact platform. It supports up to 150 A output and can be arranged with different battery and load breaker layouts, including LVBD and optional LVLD variants. Compared with smaller 1U systems, it is better suited to sites that need more distribution flexibility and higher usable capacity while still staying within a shallow cabinet-friendly mechanical format.
Flatpack S 2U/3R 2-pole 24 VDC system
The Flatpack S 2U/3R 2-pole 24 VDC system is a compact DC power platform for railway, metro, power utility, offshore, and marine applications where 24 V architecture and 2-pole distribution are required. It combines Smartpack S control, hot-pluggable HE rectifiers, 2-pole battery distribution, and 2-pole load distribution in a shallow 2U format suited to standard racks and cabinet replacements.
This version is built as a complete 125 A system with ten 2-pole 20 A load positions, pluggable breakers, and optional LVBD, which makes it suitable for compact control, protection, signalling, SCADA, safety, and communication loads. Its shallow depth and front-access service concept make it practical where field flexibility and cabinet compatibility matter as much as output capacity.
Flatpack S Stand-Alone
The Flatpack S Stand-Alone PR is a compact DC power rack for applications that need a small, flexible, and easy-to-place power unit rather than a more integrated shelf-based system. It supports 24 V, 36 V, and 48 V architectures, houses two Flatpack S rectifiers, and can be used as a simple building block in telecom, railway, utility, offshore, marine, and industrial environments. Its compact size, floating output concept, and flexible mounting options make it useful where installation freedom matters.
This version is designed for straightforward deployment and future expansion. Up to three units can be stacked, and the rack supports a broad range of Flatpack S rectifier types across different voltage architectures. It uses flying leads on the input side, M6 cable-lug output connections, and can work with external controller options where needed. In practice, it fits projects that need a compact DC source with simpler physical integration and more placement flexibility than a conventional rack-mounted distribution system.
Flatpack S Wallbox
The Flatpack S Wallbox is a compact wall-mounted DC power system for indoor telecom and industrial installations where floor space is limited and a simple cabinet-free format is preferred. It uses the Flatpack S platform in a small enclosed system designed for practical site integration, local service access, and modular DC supply in constrained environments. This makes it suitable for access networks, small technical rooms, and other installations where a wall-mounted format is more practical than a rack-based system.
Its main value is deployment flexibility. The wall-mounted format allows Flatpack S architecture to be used in sites where rack installation is unnecessary, unavailable, or inefficient. In practice, this suits smaller telecom and infrastructure applications that still need a professional DC system with integrated control and compact modular design. Compared with shelf-based versions, the Wallbox is less about rack integration and more about placing the DC system close to the load in a tidy, space-efficient indoor enclosure.
Power modules and monitoring platform
This section outlines the main building blocks behind Flatpack S, from rectifier modules to the controller layer used for supervision, alarms, configuration, and day-to-day operational visibility. It gives a clearer view of how the platform is assembled for compact telecom, rail, utility, industrial, and other space-constrained DC power applications.
Flatpack S 48/1000HE and 48/1800 rectifiers
The standard Flatpack S HE rectifier platform is the main power-conversion layer used across compact Flatpack S DC systems. It includes 1000 W and 1800 W module options, allowing the same compact architecture to be adapted to different load levels, redundancy targets, and installation constraints. This gives more flexibility when balancing cabinet space, required output, and future growth within the same platform. It is well suited to compact telecom and industrial DC systems where modularity, service access, and efficient use of limited rack or cabinet space are important.
The practical advantage of the HE rectifier platform is that it supports phased growth without changing the overall system concept. A site can start with fewer rectifier modules and expand later if the selected shelf and protection arrangement allow it. That makes the platform suitable for cabinet retrofits, smaller access sites, and installations where demand may increase over time. Because both 1000 W and 1800 W options exist within the same general architecture, the platform also gives more design freedom when optimizing around redundancy, thermal conditions, and available AC supply. The main value is scalable compact DC design with a clear path for expansion.
Flatpack S 48/1000 SHE rectifier
The 48/1000 SHE is a higher-efficiency rectifier option within the Flatpack S ecosystem for projects where reduced losses deserve more attention. It fits the same general compact modular DC architecture, so the overall platform logic stays familiar, but it shifts the emphasis toward stronger energy performance. This makes it relevant where operating efficiency, thermal behavior, or long-term energy use has more weight in the design decision. It is a useful choice in installations that want the same compact platform with a stronger focus on efficiency.
The SHE rectifier adds depth to the Flatpack S platform by giving designers an alternative to the standard HE path when efficiency becomes a stronger priority. The surrounding system concept remains broadly the same: compact shelves, modular serviceability, and scalable DC design for constrained installations. What changes is the emphasis. In the right project, even moderate efficiency gains can matter over long operating periods, especially where energy cost, thermal conditions, or operating strategy are under closer scrutiny. This makes the SHE option relevant for projects that want higher efficiency without moving away from the Flatpack S family.
Flatpack S 24/1000 HE rectifier
The Flatpack S 24/1000 HE is a compact 24 V rectifier module for rail and power utility DC systems where space is limited but reliability and serviceability remain important. It combines a short 217 mm housing, hot-pluggable design, output OR-ing protection, and wide operating temperature capability in a 1000 W format. Within Flatpack S architecture, it serves as a building block for compact DC shelves and rack systems used for control, protection, alarm, and monitoring loads. It is intended for applications that need a small footprint, simple replacement, and stable operation in demanding environments.
This module is intended for compact 24 V installations in railway, metro, and power utility environments, where auxiliary DC loads need dependable power in constrained cabinets or equipment rooms. Official material highlights use in control and protection systems, alarm systems, PLC systems, and similar support functions where modular DC design is preferred. The rectifier provides 1000 W nominal output, adjustable 21–29 VDC output range, current sharing, short-circuit protection, and wide AC/DC input compatibility. It fits projects that need compact modular growth, simple field replacement, and alignment with the wider Flatpack S platform.
Flatpack S 24/1000 SIL OVP rectifier
The Flatpack S 24/1000 SIL OVP is a compact 24 V rectifier for offshore, process industry, and other safety-critical DC applications where output overvoltage protection is a key requirement. It combines a short housing, hot-pluggable design, high power density, and SIL3-rated overvoltage protection in a 1000 W module format. In Flatpack S architecture, it fits compact 3U systems where dependable 24 V DC power is needed for safety and automation functions.
This rectifier is targeted at Safety and Automation Systems in offshore and process industry environments, where reliable DC support is required in compact installations. Official material highlights use in 3U rack systems with Smartpack S control for 2 to 8 kW applications using minimal space and low heat dissipation. It also includes OR-ing protection, wide operating temperature capability, and marine-related compliance, which makes it relevant where compact size must be combined with stronger safety-oriented DC design.
Flatpack S 36/1000 HE UI rectifier
The Flatpack S 36/1000 HE UI is a compact 36 V rectifier for rail, metro, and power utility DC applications where high reliability and limited installation space go together. It combines a short 217 mm housing, hot-pluggable design, wide AC and DC input range, and rail-oriented EMC compliance in a 1000 W module. Within Flatpack S systems, it supports compact modular DC architecture for signalling, control, and related infrastructure loads.
This module is positioned for technical environments such as FST-modem systems, line block systems, track circuits, signalling relays, and secondary substations. Official material presents it as part of compact Flatpack S solutions used in 3U systems, standalone shelves, and small bulk feed shelves where space efficiency and dependable DC power matter. Its wide DC/AC input tolerance and rail certification make it especially relevant where transport or utility infrastructure requires a compact rectifier aligned with stricter operating and compliance demands.
Smartpack S controller
The Smartpack S is the control and monitoring layer used with Flatpack S systems in small to medium telecom and industrial DC applications. It is designed for space-restricted installations and supports local and remote system access through its integrated display and Ethernet connection. Within the Flatpack S platform, it provides the practical interface for status, alarms, configuration, and everyday supervision. Its value is not only control, but also visibility: operators can manage system behaviour, review events, and monitor key conditions without adding a separate large front-end layer.
Smartpack S supports a broad range of monitoring and control functions across 12 VDC, 24 VDC, 48 VDC, and 60 VDC systems. Official material highlights Ethernet access, SNMP, logging, automatic battery monitoring and test functions, six programmable relay outputs, six programmable multi-purpose inputs, and support for battery and load disconnect control. It also includes a local 2.2-inch color display with front keys, which makes it suitable for installations where local service access still matters. In practical terms, it gives Flatpack S systems a compact but capable controller layer rather than just basic rectifier supervision.
Need help selecting the right Flatpack S configuration?
Flatpack S covers a wide range of compact DC system formats, rectifier options, and deployment scenarios. If you are comparing 1U vs 2U layouts, bulk-feed vs integrated distribution, or telecom vs rail, utility, marine, or industrial use, Astrec can help identify the most suitable platform approach for the project.