The polyester Box capacitor is made of two metal plates with the polyester film sandwiched between them, or the insulator might be covered with a metalized film.
Polyester is the most widely utilised dielectric material in this capacitor, allowing the capacitor's construction to be simplified. These capacitors are pretty inexpensive and have excellent self-healing properties.

The dielectric & construction of polyester PET capacitors are used in different applications wherever sharp; spikes of quick rise time are there when they contain high dV/dt.

Applications

• This capacitor is used where maximum levels of peak current need to handle
• Used in different low-frequency pulsating & DC circuits
• Used for filtering wherever high levels of tolerance are not necessary.
• Used in the applications of coupling, decoupling & blocking of DC
• Used in power supplies wherever the levels of the highly high capacitance of electrolytic capacitors are not required.

Specification