Modalis MR 21000 AC voltage stabilizer



Modalis MR 21000 one-phase voltage stabilizer is part of the Modalis product range of Standard stabilizers. 

Modalis MR 21000 voltage stabilizer is design for protection of home and office appliances and industrial equipment with aggregate power consumption of up to 21 kVA (such is the power consumption of an office, a cottage or a production facility). To power up across-the-line motors (found in industrial machines, refrigerators, washing machines, air pumps, compressor pumps, high-pressure washers, and power tools), the voltage stabilizer must have a reserve capacity that's 1.5-3 times greater than the motor's own capacity. 

Modalis MR 21000 voltage stabilizer is designed as a free-standing unibody with indicator panel, automatic power switch and bypass on the front panel, and a screw terminal for connecting power supply and load cables on the back panel.


Design features:

  • free-standing unibody;
    • toroidal power autotransformer;
    • double load protection from critically high input voltages;
    • automatic disconnection of autotransformer in case of input voltage surge over 300 V with subsequent automatic reactivation once a safe voltage has been restored;
    • ambient cooling (no fan);
    • discrete (step-by-step) adjustment of output voltage;
    • high overload capacity;
    • relay power switches;
    • fast response time;
    • electronic overheating, short-circuit and overload protection with automatic disconnection;
    • ability to work at declared load power within the entire range of input voltages;
    • automatic power cutoff when input or output voltage exceeds the preset threshold with subsequent automatic reactivation after voltage is restored to levels within the allowed range of operation;
    • manual bypass;
    • input and output power filter to suppress high frequency distortions;
    • LED indicators of operating modes and main parameters (input and output voltage, load power);
    • screw terminal for connecting power supply and load cables.


Product specifications

Number of phases 1
Maximum load capacity, kVA 21
Admissable overload 100% - 1 s, 50% - 2 s, 12% - 20 s
Effective range of input phase voltage, V 180-245
Extreme range of input phase voltage, V 150-255
Rated input frequency, Hz 50
Input frequency range, Hz 48-52
Stabilization of output phase voltage, % ±4
Effective range of output phase voltage, V 211-229
Number of correction levels 8
Energy conversion efficiency, % 98
Range of load change, % 0...100
Load power factor 0-1
Type of switches relay
Time of voltage adjustment for one correction level, ms <=40
Overload and short-circuit protection electronic, with automated switch
EMI/RFI filter input/output
External temperature range, °С +1...+40
Relative air humidity, % 0...80
Cooling procedure ambient
Protection rating IP30
Weight, kg 81
Overall dimensions (WxHxD), mm 330 x 670 x 570
Warranty, months 12
Service life period, years 10


pdf Manual
pdf Certificate