B25671A4177A375 Datasheet, PDF (5/8 Pages) EPCOS – PoleCap Capacitors for Power Factor Correction (Outdoor usage)

Power Capacitors
Power Factor Correction
B25671A4177A375
MKK440-D-10.4-P
Cautions, Installation and Maintenance
In case of dents of more than 2 mm depth or any other mechanical damage, capacitors must not
be used at all.
To ensure the full functionality of the overpressure disconnector, elastic elements must not be
hindered and a minimum space of 5 cm has to be kept above each capacitor.
Do not handle the capacitor before it is discharged to max. 10% of rated voltage.
Resonance cases must be avoided by appropriate application design in any case.
Handle capacitors carefully, because they may still be charged even after disconnection due to
faulty discharging devices.
Protect the capacitor properly agains overcurrent and short circuit.
When the red stripe of the visual fault indicator can be seen, the capacitor has to be replaced in
any case.
Failure to follow cautions may result, worst case, in premature failures, bursting and fire.
Discharging
Capacitors must be discharged to a maximum of 10% of rated voltage before they are switched in
again. This prevents an electric impulse discharge in the application, influences the capacitor’s
service life and protects against electric shock. The capacitor must be discharged to 75 V or less
within 3 minutes. There must be not any switch, fuse or any other disconnecting device in the circuit
between the power capacitor and the discharging device. PoleCap capacitors have a pre-mounted
ceramic discharge module; alternatively discharge reactors are available from EPCOS. Discharge and
short circuit capacitor before handling!
Service life expectancy
Electrical components do not have an unlimited service life expectancy; this applies to self-healing
capacitors too. The maximum service life expectancy may vary depending on the application the
capacitor is used in.
Safety
Ensure good, effective grounding for capacitor enclosures.
Provide means of disconnecting and insulating a faulty component/bank.
Handle capacitors carefully, because they may still be charged even after disconnection due to
faulty discharging devices.
The terminals of capacitors, connected bus bars and cables as well as other devices may also be
energized.
Follow good engineering practice.
Overcurrent and short circuit protection
Use HRC fuses or MCCBs for short circuit protection. Short circuit protection and connecting
cables should be selected so that 1.5 times the rated capacitor current can be permanently
handled.
HRC fuses do not protect a capacitor against overload
- they are only for short circuit protection.
The HRC fuse rating should be 1.6 to 1.8 times rated capacitor current.
FK PFC R&D
Please read the important notes,
cautions and warnings.
Page 5 of 8
2005-06-03