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Metallized Construction

 
The metallized type of construction also makes it possible to produce wound capacitors with larger capacitance values in small sizes (~ 0.01µF through 100µF and larger). In the case of M capacitors, thin layers of aluminium (~ 0.03µm) are vacuum-deposited on the insulating film as conducting electrodes. In the case of a breakdown, the short circuit current causes the thin metal coating to evaporate around the point of failure, without reducing the quality of the dielectric. An insulating area is formed, the capacitor remains intact (self-healing). The capacitance loss of a few pF which this causes, is of no importance.

With metallized capacitors, the breakdown strength of the insulating film can be used to the full. During the production of the capacitors the weak points are burnt out. This makes it possible to use the thinnest insulating films right down to < 1µm in thickness.

In contrast to the advantages of the small dimensions and the self-healing properties of metallized capacitors, there is the disadvantage of a limited current loading capacity as a result of the thin, vacuum-deposited metal layers.

 

Advantage: Construction with the most favorable capacitance/volume value.

 

WIMA types with metallized construction:

 

WIMA SMD-PET WIMA SMD-PEN WIMA SMD-PPS WIMA MKS 02 WIMA MKS 2 WIMA MKS 2-XL WIMA MKM 2 WIMA MKP 2 WIMA MKI 2 WIMA MKS 4 WIMA MKS 4-LN WIMA MKM 4 WIMA MKP 4