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Contactors

When choosing switching contactors for capacitors used to compensate the reactive power present in the network, you should bear several aspects in mind:

– on being energized the capacitor is connected in parallel to the inductive network and the oscillating circuit produced by connecting the capacitor to the network will result in the passage of a high-frequency current (from 3 to 15 kHz), which may be 160 times greater than the In current for 1 or 2 ms.
– the presence of harmonic currents and the tolerance with respect to mains voltage determine the continuous passage, within the circuit, of a current whose value is around 1.3 times greater than the rated current In of the capacitor.
– Because of the tolerances allowed by the manufacturer, the exact power of a capacitor may be 1.10 times greater than the rated power.

The contactor employed must therefore be capable of working with:

– an elevated, albeit transient, peak current during the closing phase.
– a closing current that may be 1.43 times greater than the rated current of the capacitor.

The contactors offered by Ducati Energia are specifically engineered to work in these conditions. In the event of particular conditions of use (higher switch-on current, higher harmonic current values) you should contact our technical service department.

Short circuit protection is generally assured by gG fuses with current ratings from 1.5 to 1.8 times the capacitor In.

Selection table

Select the type of contactor based on the working voltage and effective power (in kVAr) of the capacitor bank to be controlled

Standars:

  • IEC Pub. 947-4-1 (1990)
  • IEC Pub. 947-1 (1988)

 

Part n.
315.99.
kVAr 50/60 Hz
∂≤ 55°C
  Auxiliary contacts Maximum operating frequency Electric life with rated load
  200V
240V
400V
440V
NA NC    
1143 6,7 12,5 1 1 240 200.000
1142 10 20 1 1 240 100.000
1141 15 25 1 1 240 100.000
1140 20 40 1 2 100 100.000
1139 40 60 1 2 100 100.000
230 Vac 50/60Hz coil for all sizes

(1) = average temperature over 24h as per standards IEC 70 and 851

Warning: The capacitors must be completely discharged before being energized by closing contacts (max voltage at terminals < 50 V).

 

12.5 – 20 – 25 kVAr 40 – 60 kVAr
12-5 - 20 - 25 kVAr 40 - 60 kVAr
  A
(mm)
B
(mm)
C
(mm)
D
(mm)
E
(mm)
F
(mm)
  G
(mm)
H
(mm)
I
(mm)
L
(mm)
12.5 kVAr 130 117 80 74 45 35 40 kVAr 180 150 114 75
20 kVAr 140 130 93 84 56 40 60 kVAr 200 157 125 75
25 kVAr 140 135 98 84 56 40