Reactive power compensation with thyristors

Compensation system multicab-R-T

Reactive power compensation systems
multicab R Thyro open closed multicomp

The multicab-R-T compensation system provides you with automatically controlled power factor correction in the floor-standing enclosure with minimal switching delays. The thyroswitch thyristor switches enable reactive current compensation almost in real time.

Due to their unlimited switching frequency and minimal switching delay, the thyristor switches in the compensation system switch the capacitors on and off quickly and wear-free. When the capacitors are switched on in a controlled manner, no switch-on current peaks occur and the switching contacts do not wear out. his reduces the load on the capacitors, which in turn leads to a longer service life for the entire power factor correction system – a clear advantage over conventional standard contactors.

Technical details
  • Outputs from 75 to 250 kvar
  • Throttling factors 5.5, 7 or 8 % or 12.5 or 14 %
  • Capacitors multicond-UHPC with 525 V
  • Fast-switching reactive power controller multicomp F144-12DO
  • Long service life due to unlimited switching frequency
  • No noise when switching the steps


Measurements (H x W x D in mm):

S5 (2000 x 800 x 600)


Device type

SSTB p = 5.5, 7 or 8 %
SSTB p = 12.5 or 14 %
Rated voltage | frequency: Un = 400 V | 50 Hz
Maximum permissible operating voltage: Un = 400 V ± 10 %
Maximum permissible operating current: 1.3 xIn permanent
Reactive power controller: multicomp F144-12DO, with 12 optocouplers – outputs for dynamic compensation systems
Current transformer connection: 1 A and 5 A
Switching element: Thyristors
Control voltage: DC control: Utax = 10 – 30 V
AC control:Utax = 230 V, 50/60 Hz
Control via reactive power controller or directly via PLC or process controller
>>> Control voltage transformer required for deviating operating voltage
Switching delay: DC control: 1 – 15 ms, dynamic controller required
AC control: 10 – 25 ms with direct control
500 ms with control via standard reactive power controller
Capacitors: Low-loss multicond UHPC power capacitors, MTK technology
Nominal capacitor voltage: UBem. = 525 V
Discharge of the capacitors: The EPL technology means that no unloading time is required during operation.
Discharge resistors t < 180 s no discharge throttling possible.
Filter circuit chokes: Linear filter circuit chokes to avoid resonances in networks with harmonics,
Built-in temperature monitoring
Throttling factors: p = 5.5, 7 or 8 % ; p = 12.5 or 14 %
Housing design: Sheet steel cabinet, interior and exterior paint finish RAL 7035 (other paint finishes on request),
Galvanized module panels, door hinge left (optionally right), bottom feed (on request from above), protection class I
Protection class: IP 20 (IP 54 on request), the components used comply with DGUV regulation 2 (on EN “DGUV rule 3”)
Ambient temperatures: + 40 °C Maximum value, short-term
+ 35 °C in 24-hour average
+ 20 °C annual average
– 10 °C Lowest value
Ventilation: Built-in roof ventilator, temperature-controlled
Protection: Group fuse protection with NH fuses and fuse bases
(NH isolator on request)



Thyristor switch


Safety and maintenance module


Power factor correction system in the floor-standing cabinet

Support Team

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Phone: +49 9122 6373-0

Tablet mit Screenshot


More information (brochures, user manuals, etc.) under download.