Current rating
The maximum permitted rms current for each partucular capacitor is specified in the data charts. Permanent exceeding of these values will lead to increased self-heating of the capacitor and -as a result-reduced lifetime.Higher rms values require adjustments in construction and are available on request.

Discharge
Capacitors should be discharged to 10% of the rated voltage prior to being re-energised. For this purpose special discharge mojules are offered for capacitors in design L/M, which can be seleced in accordance with the applied operating voltage and the desired discharge period. Standard IEC 831 requires a discharge to 75V or less within 3 minutes. Note that in automatic capacitor banks shorter discharge cycles may be required.

Use rapid discharge reactors or switchable discharge resistors for very short discharge cycles. Capacitors must be discharged and short-circuited before working on the terminals. Please note that capacitors with nominal voltages of more than 750V, when having been short-circuited only shortly, may generate new voltages caused by inner series connections. Capacitors out of use should therefore be short-circuited permanently.

Mounting Location/cooling
To avoid overheating the capacitors must be allowed to emit their heat losses unhindered and should be shielded from external heat sources. The permitted temperature category of the capacitor is stated on the label. If attenuating circumstances give cause for doubt, special tests should be conducted to ensure that the permitted maximum ambient temperature of the capacitor is not exceeded. It should be noted that the internal heat balance of large capacitors is only reached after a couple of hours.
The useful life of a capacitor may be reduced dramatically if exposed to excessive heat. Do not place the capacitors directly above heat sources such as detuning or tuning reactors, bus bars, etc. Give at least 20mm clearance between and around the capacitors for natural or forced ventilation (especially in detuned capacitor banks.)

Vibration stress according to DIN IEC 68-2-6:
Please consult our technical department for details of permitted vibration stress in your application.
Note that capacitors fitted with the EL=Dr discharge reactor must not be exposed to any vibration stress at all.

Connection
Fuses and cross section of the leads shall be sized for at least 1.5times of the rated capacitor current.
Please note that the permitted max.current (acc.to data chart) must not be exceeded.

Earthing
Capacitors with a metal case must be earthed at the mounting stud or by means of a separated metal strap or clamp.

Disposal
All USM capacitors are totally free of PCB and do not cantain toxic substances.
When disposing of or arranging for the disposal of the capacitors it should be noted that MPP-capacitors are filled with oil. A data sheet about the impregnant can be provided by the manufacturer.
MKP-capacitors in design A are filled with viscous polyurethane resins. The gas-filled MKPg capacitors contain only neutral, physiologically sound insulation gasses.