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Sentinel Tower STW (5 – 10 ΚVA)

Sentinel Tower STW (5 – 10 ΚVA)

On Line UPS 

Sentinel Tower is the ideal solution for protecting mission critical systems such as safety devices, telecommunications equipment but also IT systems to ensure maximum power reliability. Sentinel Tower is designed and built using state-of-the-art technology and components to provide maximum protection to the powered loads with no impact on downstream systems and optimised energy savings. The series includes 5-6 kVA/kW single/ single-phase and 8-10 kVA/kW single/threephase input single-phase output models with on-line double conversion technology (VFI): the load is powered continuously by the inverter which supplies a sinusoidal voltage, filtered and stabilised in terms of form and frequency. Input and output filters provide significant further immunity from mains disturbances and lightning strikes. In terms of technology and performance, Sentinel Tower is one of the best UPS available on the market today: three level inventer to achieve 95% efficiency, output power factor 1 to Increase in efficiency of system and devices and reduce power system losses. Selectable Economy Mode and Smart Active Mode functions; new custom diagnostics LCD display, RS232 and USB interfaces with Powershield3 software, ESD input, interface slot with optional boards.


Technical Specifications

Product Brochure

Product video

  • High UPS reliability
  • Total microprocessor and DSP control.
  • Interruption-free static and manual bypass.
  • Specifications guaranteed up to 40°C (the components are designed to work at high temperatures and thus are subject to less stress at normal temperatures).

Parallelable Parallel configuration of 3 units for (2+1) redundant or power parallel system. The UPS continue to operate in parallel even if the connection cable is interrupted (Closed Loop).

Unity Power Factor

  • More power delivered
  • More real output power (W) Operating mode selection The operating mode can be programmed via software or manually via the front display panel.
  • On line: efficiency up to 95%.
  • Economy Mode: to increase efficiency (up to to 98%), allows for the selection of Line Interactive technology (VI) to power low priority loads from the mains supply.
  • Smart Active: the UPS automatically decides upon the operating mode (VI or VFI) based on the quality of the mains power supply.
  • Emergency: the UPS can be selected to function only when the mains power supply fails (emergency only mode).
  • Frequency converter operation (50 or 60 Hz). High quality output voltage • Even with non-linear loads (IT loads with a crest factor of up to 3:1).
  • High short circuit current on bypass.
  • High overload capacity: 150% by inverter (even with mains failure).
  • Filtered, stabilized and reliable voltage (double conversion on-line technology – VFI compliant with EN62040-3), with filters for the suppression of atmospheric disturbances.
  • Power factor correction: UPS input power factor close to 1 and sinusoidal current uptake. Simplified installation
  • UPS can be installed on a single-phase or three-phase distribution network STW 8000 and STW 10000. • Output terminal board + 2 IEC sockets for powering local consumers (computers, devices, etc.).
  • Simplified positioning (built-in castors).

High battery reliability

  • Automatic and manual battery test.
  • Proper battery care is critical to ensuring correct UPS operation in emergency conditions.

The Riello UPS battery care system consists of a series of features and capabilities to optimise battery management and obtain the best performance and operating life possible.

  • Unlimited extendible runtime using matching Battery Boxes.
  • The batteries do not cut in during mains failures of 20 kHz, value above audible range).
  • Auto restart (automatic when mains supply is restored, programmable via software.
  • Emergency function: the UPS can be selected to function only when the mains power supply fails (emergency lights).
  • Back-feed protection standard: to prevent energy from being fed back to the network.
  • UPS digital updating (internal flash memory). Advanced communications
  • Compatible with Riello Connect remote monitoring.
  • Advanced multi-platform communications for all operating systems and network environments: PowerShield3 monitoring and shutdown software for Windows operating systems 10, 8, 7, Hyper-V, 2019, 2016, 2012 and previous versions, Mac OS X, Linux, VMWare ESXi, Citrix XenServer and other Unix operating systems.
  • RS232 serial and USB ports.
  • Plug and play function.
  • Slot for installation of communications boards.

MODELS STW 5000 STW 6000 STW 6000 ER STW 8000 STW 10000 STW 10000 ER
Nominal Voltage 220-230-240 VAC

380-400-415 VAC (3W+N+PE)

22-230-240 VAC (3W+N+PE)

Voltage Tolerance 230 VAC ±20% 400 VAC ±20% / 230 VAC ±20%
Minimum Voltage 184 VAC 318 VAC / 184 VAC
Maximum Operating Voltage 276 VAC 478 VAC / 276 VAC
Nominal Frequency 50/60 Hz  ± 5Hz
Power Factor > 0,98
Current Distortion ≤5%*
Voltage tolerance 180 – 264 VAC ( selectable in Economy Mode or Smart Active Mode)

Frequency tolerance

Selectable frequency ± 5% (selected by user)

Overload Times

110% continuous, 130% for 1 hour, 150% for 10 minutes, over 150% for 3 seconds

Nominal Power (VA) 5000 6000 6000 8000 10000 10000

Active power (W)

5000 6000 6000 8000 10000 10000

Nominal Voltage

220-230-240 VAC selectable

Voltage distortion

< 1% with linear load / < 3% with non-linear load
Frequency 50/60 Hz selectable
Static variation 1,5%
Dynamic variation  ≤5% in 20 ms
Waveform Sinusoidal
Crest factor 3:1
Type VRLA AGM maintenance-free lead based
Recharge Time 4-6 hours
Net Weight (kg)







Gross weight (kg) 68 69 31 84 90 34
Dimensions (WxDxH) (mm)  250 x 698 x 500
Package Dimensions (WxDxH) (mm) 300 x 800 x 702
Efficiency Up to 95% on line mode, 98% eco mode
Protections Overcurrent – short circuit – overvoltage -undervoltage – temperature – excessive low battery
Parallel Operation Optional Parallel Card
Communications USB / RS232 / Slot for Communications Interface / REPO + Input contact
Input Connection Terminal block
Output Sockets Terminal block + 2 IEC 320 C13
Standards EN 62040-1 EMC EN 62040-2 Directives 2014/35/EU – 2014/30/EU EN 62040-3
Operating Temperature 0 ° C/ +40 ° C
Relative Humidity <95% non-condensing
Colour Black RAL 9005
Noise level at 1 m (ECO mode) < 48 dBA
Standard Equipment Provided USB cable
Moving UPS castors













Download the Pdf here

Watch the video here.   











Watch the video here.







Watch the video here.