Humidity-resistant X2 capacitors
●X2 capacitors are used not only for EMI suppression. Thanks to their robustness and resistance to humidity and high temperatures, they are also suitable for voltage dividers in capacitive power supplies – for example, those of smart meters that are mounted outside buildings.
●A new series of EPCOS X2 interference suppression capacitors offers stable capacitance values even under extremely humid conditions. TheB3292*H/J* series for operating voltages of up to 305 V AC comprises types with rated capacitances ranging from0.1 μF to 15 μF, lead spacings from 15 mm to 37.5 mm and operating temperature ranges from -40 °C to +110 °C. In addition, the capacitors, which employ a metallized polypropylene dielectric (MKP), also feature excellent self-healing properties. These allow weak dielectric areas to be burned out in the event of overvoltages.
●Particularly in the case of capacitive power supplies in which the capacitor - in contrast to the interference suppression function - is switched in series with the load, extremely high demands are made on these components.
●The X2 capacitors must also offer considerable long-term stability, even under harsh operating conditions such as high temperature and air humidity. With standard capacitor types, this can sometimes result in a degradation of the metallization, causing a reduction of the capacitance. This in turn means that, in the capacitive voltage divider of a capacitive power supply, sufficient voltage is no longer available for supplying the load.
●The new EPCOS X2 capacitors of the B3292*H/J* series, however, function reliably under even the most demanding ambient conditions and effortlessly meet the demands of the humid-heat tests. This means that the capacitance value during a test period of at least 1000 hours at a temperature of 85 °C, a relative humidity of 85 percent and a voltage of 240 V AC does not change by more than 10 percent. Consequently, the new capacitors are very suitable as voltage dividers in the capacitive power supplies of outdoor energy meters.
●Main features and benefits
■Stable capacitance values even under extremely humid conditions
■Excellent self-healing properties
■High maximum operating temperature up to +110 °C
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[ capacitive power supplies ][ voltage dividers ][ outdoor energy meters ][ Across-the-line industrial applications ] |
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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July 2015 |
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161 KB |
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