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Power Range

10 - 20 kVA
  • 1-3:1
  • 3:3


  • Flexible choice of 3 cabinet sizes (Compact, Active, Xtend) 
  • Operating efficiency up to 96.5% (online mode) 
  • Delivers unity power factor (kVA = kW) 
  • High overload and short circuit capacity 
  • Large colour touchscreen display and LED status indicator  

Our third generation of transformerless ON LINE UPS systems. The 10-20 kVA Sentryum rewrites the concept of flexible power by offering a choice of three compact cabinet sizes to suit the needs of any small data centre or mission-critical application.  

Enhanced overload and short circuit capacity guarantee maximum availability. Incorporating a 5-inch colour touchscreen display and intuitive LED status indicator that automatically changes colour based on the UPS’s current operating state.  

Enquire About This Product



The Sentryum (S3T) range is Riello UPS’s third generation of transformerless online uninterruptible power supplies.  

Available in 10-15-20 kVA versions, the Sentryum improves on our popular Multi Sentry (MST) series and has been developed following extensive customer feedback.

The S3T redefines the concept of flexible power protection by offering three different cabinet sizes to meet the varied needs of small data centres and mission-critical applications: 

Compact (CPT) 

  • Footprint less than 0.25 m2 and volume of 0.17 m3  
  • 280mm x 840mm x 700mm (W x D x H) 
  • 1 internal battery string 
  • Specifically designed for extremely restricted spaces 

Active (ACT) 

  • Footprint less than 0.35 m2 and volume of 0.33 m3  
  • 380mm x 850mm x 1025mm (W x D x H)  
  • 1 or 2 internal battery strings 

Xtend (XTD) 

  • Footprint less than 0.4 m2 and volume of 0.5 m3  
  • 440mm x 840mm x 1320mm (W x D x H) 
  • Up to 3 internal battery strings in a single cabinet 
  • Option to add isolation transformer 
  • Can upgrade enclosure protection from IP20 or IP21 to IP31 

The Sentryum is manufactured used state-of-the-art components designed to run flawlessly at temperatures up to 40 °C. These include a dual-core DSP processor and three-level inverters that operate at high frequency (18 kHz). 

This ensures the S3T delivers full-rated power (kVA = kW 1 pf) with exceptional operating efficiency of up to 96.5% in online double conversion mode.  

Available as three-phase/single phase input, single-phase output or three-phase input and output, the UPS has a unique control system that reduces harmonic voltage distortion (< 1% at resistive load and < 1.5% at non-linear load). 

In addition, the Sentryum has high overload (125% for 10 minutes, 150% for 1 minute) and short circuit (270% for 200ms and 150% for 300ms) capacity, which enables it to handle sudden peak loads without needing to transfer to bypass. 

Install up to 8 S3Ts together in parallel to scale capacity or build in redundancy (i.e. N+1 configuration). Closed loop system ensures the UPSs continue to function even if there’s a disruption to the connecting cables.  

A revamped 5-inch colour touchscreen display panel clearly highlights crucial UPS measurements and operating statuses. While an innovative new LED status indicator automatically changes its colour (light blue, dark blue, yellow, red) depending on the operating mode and condition of the UPS. 

Full range of user-controllable operating modes including: 

  • ECO (up to 99% efficiency) 
  • Emergency (Standby Off) 
  • Frequency Converter 

The Sentryum range is suitable for use with sealed lead-acid (VRLA), AGM, GEL, open vent or nickel cadmium batteries, as well as alternative backup sources such as supercapacitors and lithium-ion batteries. 

It incorporates sophisticated battery management systems, such as deep discharge protection and recharge voltage compensation, to ensure the best performance and operating life. Higher-powered (20 A) battery chargers are available for longer runtime applications.  

The S3T incorporates USB, RS232, and RJ10 ports, plus various slots to insert parallel and network communications cards. It is compatible with the full range of Riello UPS networking and UPS management software, including PowerShield3 and PowerNetGuard.  

Technical Specifications

Rated power 10000 VA
Voltage 380 / 400 / 415 V three-phase + N - 220 / 230 / 240 V single-phase + N
Voltage tolerance 240 to 480
Frequency tolerance 40-72 Hz
Power factor 0.99
Rated voltage 220 / 230 / 240 V single-phase + N
Voltage tolerance From 180 (adjustable 180-200) to 264 (adjustable 250-264) referring to neutral
Rated frequency 50 or 60 Hz (selectable)
Frequency tolerance ±5% (selectable)
Number phases 1 + N
Rated power 10000 VA
Active power 10000 W
Output current 48 A
Number phases 1 + N
Crest factor (Ipeak/Irms) 3 : 1
Waveform Sinewave
Static stability ±1%
Dynamic stability EN 62040-3 class performance 1 distorting load
Frequency 50 or 60 Hz
Voltage distortion with distorcing load ≤ 1.5%
Voltage distortion with linear load < 1%
Overload 125% for 10 min - 150% for 1 min - 200% for 0.5 sec
Type VRLA AGM/GEL/NiCd/Li-ion/Supercaps
Typical recharge time One level, Two level, Cyclic recharge (selectable)
Color RAL 7016 Anthracite grey
Communication UPS status led bar - Graphic touch screen diplay - 2 slots for communications interface USB - RS232 - Contact interface with 5x opto insulated Input and 4x Output relays
Safety compliance IEC EN 62040-1
EMC conformance IEC EN 62040-2
Protection rating IP20
Other compliances RoHS compliant; Classification in accordance with IEC 62040-3 (Voltage frequency Indioendent) VFI - SS - 111
AC/AC efficiency 95.9%
Line-Interactive/Smart Active efficiency Up to 99%
Noise (at 1 m) < 40 In SMART ACTIVE Mode
Remote signals voltage free contacts
Operating temperature 0 °C - +40 °C
Relative humidity 5%-95% non-condensing
Weight 48 kg
Dimensions (h w d) 700x280x840 mm

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