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Multi Sentry (30-200 KVA)

Multi Sentry (30-200 KVA)

On Line UPS

The Multi Sentry series is ideal for protecting data centres and telecommunications systems, IT networks and critical systems in general, where the risks connected with poor energy supply can compromise the continuity of activities and services. Multi Sentry is designed and built using state-of-the-art technology and components. It is controlled

by a DSP (Digital Signal Processor) microprocessor, to provide maximum protection to the powered loads with no impact on downstream systems, and optimised energy savings.


Multi Sentry (30-200KVA)

Product Brochure

Main features:

Zero impact source

Multi Sentry solves installation problems in systems where the power supply has limited power available, where the UPS is supported by a generator or where there are compatibility problems with loads that generate harmonic currents; Multi Sentry has a zero impact on its power source, whether this is the mains power supply or a generator:

  • input current distortion < 3%
  • input power factor 0,99
  • power walk-in function that ensures progressive rectifier start up
  • start-up delay function, to restart the rectifiers when mains power is restored if there are several UPS in the system.

In addition, Multi Sentry plays a filtering and power factor correction role in the power network upstream of the UPS, as it eliminates harmonic components and reactive power generated by the power utilities.

Battery care system

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. Battery recharging: Multi Sentry is suitable for use with hermetically sealed lead-acid (VRLA), AGM and GEL batteries and Open Vent and Nickel Cadmium batteries. 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
  • Charge blocking system to reduce electrolyte consumption and lengthen the life of VRLA batteries.

Recharge voltage compensation based on temperature in order to prevent excessive battery charges 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 performance. Ripple current: recharge ripple current (residual AC component) is one of the main causes of reduced reliability and battery life. Using a high frequency battery charger, Multi Sentry reduces this value to negligible levels, prolonging battery life and maintaining high performance over a long period of time. Wide voltage range: the rectifier is designed to operate within a wide input voltage range (up to – 40% at half load), reducing the need for battery discharge and thus helping to extend battery life.

Maximum reliability and availability

Distributed parallel configuration of up to 8 units per redundant (N + 1) or power parallel system. The UPS continue to operate in parallel even if the connection cable is interrupted (Closed Loop).

Advanced communications

Multi Sentry is equipped with a back-lit graphic display (240×128 pixels) providing UPS information, measurements, operating states and alarms in different languages. It can also display wave forms and voltage/ current forms. A wide range of comunications options are available to ensure global and comprehensive UPS monitoring.

MODELS MST 30 MST 40 MST 60 MST 80 MST 100 MST 125 MST 160 MST 200


Nominal Voltage  380-400-415 VAC three-phase + N
Nominal frequency 50/60 Hz
Frequency tolerance 40 – 72 Hz
Power factor at full load 0,99
Current distortion THDI ≤ 3% THDI ≤ 2,5%


Nominal voltage 380-400-415 VAC three-phase + N
Number of phases 3 + N
Voltage tolerance (Ph-N) 180 – 264 VAC (selectable)
Nominal frequency 50 or 60 Hz (selectable)
Frequency tolerance ±5 (selectable)
Bypass overload 125% for 60 minutes, 150% for 10 minute


Nominal power (kVA) 30 40 60 80 100 125 160 200
Active power (kW) 27 36 54 72 90 112,5 160 200
Power factor 0,9 1
Number of phases 3 + N
Nominal voltage (V) 380-400-415 VAC three-phase + N (selectable)
Static variation ± 1%
Dynamic variation ± 3%
Crest factor 3 : 1 Ipeak/Irms
Voltage distortion ≤ 1% with linear load / ≤ 3% with non-linear load
Frequency 50/60 Hz
Frequency stability during

battery operation



Type VRLA AGM/GEL/NiCd/Li-ion/Supercaps
Recharge Time 6 hours


Weight without batteries (kg) 135 145 190 200 220 250 450 460
Dimensions (WxDxH) (mm) 440 x 850 x 1320 500 x 850 x 1600 650 x 840 x


850 x 1050 x 1900
Communications 3 slots for communications interface / USB / RS232
Operating temperature 0 – 40 ° C
Relative humidity 90% non-condensing
Colour Dark grey RAL 7016
Noise level at 1 m [dBA ±2]

Smart Active

< 40 dBA < 63 dBA < 50 dBA
IP rating IP20
Smart Active efficiency up to 99%
Standards European Directives: L V 2006/95/CE low voltage Directive

EMC 2004/108/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 (30 – 200 kVA)










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