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On Line UPS

The Sentryum 10-120 KVA/kW offers the best combination of power availability, energy efficiency and global performance ensuring installation and running cost savings. It is the very latest Riello
UPS development resulting in a third generation transformer-free UPS, originally introduced into the market over twenty three years ago. This ultimate solution is rated at output power factor 1 and
defined as ON LINE double conversion technology in accordance with VFI-SS-111 classification (as set out in standard IEC EN 62040-3). The Sentryum series is a transformer-free UPS available in 10-15-20 KVA/kW models with three-phase/single-phase input and single-phase output and 10-15-20-30-40-60-80-100-120 KVA/kW models with three-phase input and output.


• Extensive range of solutions
• Compactness
• Efficiency up to 96.6%
• High power availability
• Smart battery management
• Maximum reliability
• Flexibility of use
• Graphic touch screen display


Technical Specifications

Product Brochure

Product Video


Sentryum has been conceived to optimise the specific requirements by enhancing the installation flexibility. Riello UPS offers Sentryum in four different frame solutions to satisfy any critical power demand and application. Three of the frame types are available for the Sentryum 10-60 KVA/kW power ratings:

Compact (CPT): this cabinet frame is specifically devised to offer a compact but efficient solution for tailored applications, thanks to the ultimate technologies applied, this solution offers unmatched power (up to 20 KVA @ pf 1) and autonomy (12 minutes of backup time at typical load) in an extremely reduced space.

Active (ACT): this solution offers an optimised degree of flexibility to meet different power requirements and battery autonomies. The solution offered is extremely compact but exceptionally powerful, with the possibility to deliver up to 60 KVA (@ pf 1). The ACT model allows to build one or two levels of internal battery backup time (NB this does not apply to the 60 KVA/kW model, which does not allow the installation of internal batteries).

Xtend (XTD): this version is the most flexible solution available to meet various installation requirements and power demands. In an extremely small footprint, it is possible to build up to three-levels of battery backup time. In addition, the mechanical design makes it possible to

install an isolation transformer or easily change the degree of protection from IP20 to IP21 or even IP31. The installation of a dedicated optional seismic kit allows the XTD model to become compliant to ICC-ES AC 156 (2020) too. The fourth frame is unique for the Sentryum 80-120 KVA/kW power ratings:

S3T 80, S3T 100, S3T 120. The layout of these models doesn’t allow for the installation of internal batteries and transformers. However, as per the XTD model, the mechanical design does make it possible to easily change the degree of protection from IP20 to IP21 or even IP31. In addition, the S3T 80-120 models can become compliant to ICC-ES AC 156 (2020) simply by adding the optional seismic kit.


Modern guidelines and sustainable best practices direct us to conceive and design UPS with a particular focus on the entire product life cycle, applying ultimate but resilient technologies, recyclable materials and miniaturisation of assemblies whilst ensuring the systems’ global reliability,

which is pivotal for any UPS. The internal card layout has been optimised to reduce the number of components, interconnections and space required, whilst at the same time increasing reliability and Mean Time Between

Failures (MTBF), which helps to minimise operational expenditure such as service operations and maintenance costs. The result is an outstanding range of four different solutions providing powerful but compact designs as follows:

Sentryum 10-60 KVA/kW power ratings

Compact: less than 0.25 m2 footprint and only 0.17 m3 of volume.

Active: less than 0.35 m2 footprint and only 0.33 m3 of volume.

Xtend: less than 0.4 m2 footprint and less than 0.5 m3 of volume.

Sentryum 80-120 KVA/kW power ratings

S3T 80, S3T 100, S3T 120: less than 0.42 m2 footprint and less than 0.67 m3 of volume.


Sentryum is a true ON LINE double conversion UPS system providing the very highest levels of power availability, flexibility and unrivalled energy efficiency with superior performance for any

small Data Center and mission critical applications. With a full power rating (kVA=kW unity pf), the Sentryum provides the maximum available power without any derating. Thanks to the three-level IGBT inverter topology (constructed using modules rather than discrete components) and innovative digital controls, the Sentryum provides up to 96.6% overall efficiency, whilst maintaining a reduced number of components, connections and ribbon cables, which increases the overall system reliability thanks to a higher MTBF. Riello UPS’ advanced average current mode digital PFC control and state-of-theart three-level NPC inverters work at high frequency (18 kHz for 10-60 KVA/kW, 16kHz

for 80-120 KVA/kW), which contributes to minimising the UPS’s impact on the grid and helps to reduce the overall operational costs and energy bills. Sentryum applies a zero impact onto its power source, whether this is from the mains power supply or a generator, this results in:

• Very low input current distortion <3%

• Near unity input power factor 0.99

• Power walk-in function that ensures progressive rectifier start up

• Start up delay function, to sequentially restart the rectifiers once the mains power supply is restored if there are several UPS within the overall system

• In addition, Sentryum provides a filtering and power factor correction function within the power network upstream of the UPS, thus eliminating harmonic components and reactive power generated by the power utilities.


Sentryum’s fully rated design delivers full power (kVA=kW) regardless of the load power factor or operating temperature (full-rated power is available up to 40 °C). Furthermore, Sentryum’s advanced digital control makes it possible to deliver up to 270% inverter current for 200 ms and 150% for 300 ms. This high overcurrent availability enables the system to deal with sudden peak loads (without static bypass intervention) and provide the short circuit current if required during operation on battery.

The innovative input stage design provides extremely high battery recharging current, while at the same time an energy efficient conversion process during battery operation to reduce the power wasted and to increase the autonomy time compared to legacy DC/AC converters.


Proper battery care is critical to ensure the correct operation of the UPS during emergency conditions. The Riello UPS Smart Battery Management system consists of a series of features

and capabilities to optimise battery management and obtain the best performance and operating life possible.

Battery recharging: Sentryum is suitable for use with conventional hermetically sealed lead-acid (VRLA), AGM and GEL batteries, Open Vented and Nickel Cadmium batteries. Sentryum is also compatible with alternative backup power sources such as Li-Ion batteries and Supercapacitors.

Its superior battery charging current availability, i.e. up to 30 Amperes for the 40-120 KVA/kW power range, means that the Sentryum can be utilised within any extended battery autonomy application.

Depending on the battery type, different charging methods are available:

• One-level voltage recharge, typically used for widely available VRLA AGM batteries.

• Two-level voltage recharge according to IU specification.

• Cyclical recharge system to reduce electrolyte consumption and lengthen the life of VRLA batteries.

The battery management system also incorporates:

• Recharge voltage compensation based on ambient temperature to prevent excessive battery charging or overheating.

• Battery tests to diagnose in advance any reduction in performance or problems with the batteries.

• Deep discharge protection: during extended low-load discharges, the end of discharge voltage is increased – as recommended by battery manufacturers to prevent damage or reduced battery


• Ripple current: recharge ripple current


S3M 10 ACT

S3M 10 XTD

S3M 15 CPT

S3M 15 ACT

S3M 15 XTD

S3M 20 CPT

S3M 20 ACT

S3M 20 XTD

S3T 10 CPT

S3T 10 ACT

S3T 10 XTD

S3T 15 CPT

S3T 15 ACT

S3T 15 XTD

S3T 20 CPT

S3T 20 ACT

S3T 20 XTD

S3T 30 ACT

S3T 30 XTD

S3T 40 ACT

S3T 40 XTD

S3T 60 ACT

S3T 60 XTD

S3T 80 S3T 100 S3T 120
Rated Voltage 380-400-415 VAC three-phase + N / 220-230-240 VAC

single-phase + N

380-400-415 VAC 3Ph + N
Rated frequency 50/60 Hz
Voltage tolerance 230 / 400 ±20% @ full load 400 ±20% @ full load
Frequency tolerance 40 – 72 Hz
Power factor @ full load 0,99
Current distortion THDI ≤ 3%
Rated Voltage 220-230-240 VAC single-phase+ N 380-400-415 VAC 3Ph + N
Number of phases 1 3 + N
Voltage tolerance (Ph-N) 180 – 264 VAC (selectable)
Rated frequency 50 or 60 Hz (selectable)
Frequency tolerance ±5% (selectable)
Bypass overload 110% infinite, 125% for 60 min, 150% for 10 min
Nominal power (kVA) 10 15 20 10 15 20 30 40 60 80 100 120
Active power (kW) 10 15 20 10 15 20 30 40 60 80 100 120
Power factor 1 up to 40 ° C
Number of phases 1 3 + N
Rated Voltage (V) 220-230-240 VAC  single-phase + N  (selectable) 380-400-415 VAC 3Ph + N (selectable)
Voltage stability ± 1%
Voltage distortion ≤ 1% with linear load / ≤ 1,5% with non-linear load
Frequency 50/60 Hz
Frequency stability on battery operation 0,01%
Type VRLA AGM/GEL/NiCd/Li-ion /Supercsps
Recharging method One level, Two level, Cyclic recharge (selectable)
Weight without batteries (kg)


48 / 72 / 103 50 / 74 / 105 52 / 76 / 107 48 / 72 / 103 50 / 74 / 105 52 / 76 / 107 78/112 82/116 87/130 172 180 198
Dimensions  (WxDxH) (mm) 280 x 840 x 700 (CPT version)

380 x 850 x 1025 (ACT version)

440 x 840 x 1320 (XTD version)

Communications 2 slots for communications cards / USB / RS232/ 9 signal contacts
Operating temperature 0 – 40 ° C
Humidity 5-95%  non-condensing
Color Anthracite grey RAL 7016
Noise level at 1 m [dBA ±2],

(Smart Active mode)

< 40 dBA < 50 dBA < 55 dBA
IP rating IP20
Smart Active efficiency up to 99%
Standards European Directives: L V 2014/35/CE low voltage Directive

EMC 2014/30/CE electromagnetic compatibility Directive

Standards: Safety IEC EN 62040-1; EMC IEC EN 62040-2 C2

Classification in accordance with IEC 62040-3 (Voltage Frequency Independent) VFI – SS – 111

Moving the UPS Castors / Pallet










Download the Pdf here







Watch the video here.







Watch the video here.