Power Capacitors

B25671A5287A375

Power Factor Correction

MKK525-D-25-P

Do not use HRC fuses to switch capacitors (risk of arcing).

Use thermal magnetic overcurrent relays for overload protection.

Resonance cases

Resonance cases must be avoided by appropriate application design in any case. Maximum total

RMS capacitor current (incl. fundamental harmonic current) specified in technical data must not be

exceeded.

Overtemperature

Exceeding maximum allowed temperature may set the safety device out of operation.

Overpressure Disconnector

To ensure full functionality of an overpressure disconnector, the following must be observed:

1. The elastic elements must not be hindered, i.e.

- connecting lines must be flexible leads (cables),

- there must be sufficient space (min. 5 cm) for expansion above the connections (see

“Clearing distance for overpressure disconnector”).

- folding beads must not be retained by clamps.

2. Maximum allowed fault current of 10000 A in accordance with UL 810 standard must be assured by

the application.

3. Stress parameters of the capacitor must be within the IEC60831 specification.

Re-switching vs. phase-opposition

In case of voltage interruption, a sufficient discharge time has to be ensured to avoid phase-

Vibration resistance

The resistance to vibration of capacitors corresponds to IEC 68, part 2–6.

Max. test conditions:

Test duration

2 h

Frequency range 1

0 ... 55 Hz corresponding

to max. 0.7 g

Displacement amplitude

0.75 mm

These figures apply to the capacitor alone. Because the fixing and the terminals may influence the

vibration properties, it is necessary to check stability when a capacitor is built in and exposed to

vibration. Irrespective of this, you are advised not to locate capacitors where vibration amplitude

reaches the maximum in strongly vibrating equipment.

Mechanical protection

The PoleCap capacitor has to be installed in a way that mechanical damages and dents in the

aluminum can are avoided.

FK PFC R&D

2005-06-03

Please read the important notes,

Page

6 of 8

cautions and warnings.