940C30S47K-F Capacitors

Series:	940C
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Capacitance:	0.047µF
Tolerance:	±10%
Voltage Rating - AC:	500V
Voltage Rating - DC:	3000V (3kV)
Dielectric Material:	Polypropylene (PP), Metallized
ESR (Equivalent Series Resistance):	14 mOhms
Operating Temperature:	-55°C ~ 105°C
Mounting Type:	Through Hole
Package / Case:	Axial
Size / Dimension:	0.650" Dia x 1.811" L (16.50mm x 46.00mm)
Height - Seated (Max):	--
Termination:	PC Pins
Lead Spacing:	--
Applications:	High Pulse, DV/DT
Ratings:	--
Features:	--

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Introduction

Film capacitors are widely used in a variety of medium, low and high voltage applications, from signal filtering and signal transmission to AC input line filtering and motor start circuits. 940C30S47K-F is one of the film capacitor family, which is particularly useful for applications in high voltage, high current applications. It has a voltage rating of about 30kV, and a current rating of about 470A. It is manufactured in various sizes and shapes, including the popular DIN rail mountable form factor.

Working Principle

A voltage is applied across two terminals of the capacitor and the charge immediately flows through a dielectric media that separates the two plates of the unit. When the voltage is removed, an electric field is created that stores the charge inside the capacitor. The capacitor remains charged until the electric field generated is either discharged or dissipated. Film capacitors, or film dielectric capacitors, use a thin film of plastic or paper as the dielectric layer. Positively charged ions and free electrons move between these plates and create the electrostatic field that stores the electrical energy.

940C30S47K-F Application Field

The 940C30S47K-F series is suitable for a variety of power electronics applications. It is used as a snubber capacitor in switch mode power supplies and DC-DC converters, as well as for snubbing DC link circuits. It is also useful for various AC frequency compensations, especially in compensation networks for motor start operations and variable frequency drives. Due to its high current rating and insulated case, this capacitor series is also extensively used in high voltage applications like pulse transformers and medium voltage variable frequency drive systems. It can also be used in other high current applications, such as power factor correction, snubber circuits and discharge reactor capacitor modules. The 940C30S47K-F series is designed to operate at high temperature, making it suitable for applications that involve large temperature swings.

Conclusion

The 940C30S47K-F is a film capacitor that is especially suited for high voltage and current applications. Its high current rating and high temperature operation make it suitable for numerous power electronics applications such as snubber capacitor in SMPS, DC-DC converters, pulse transformers, and medium voltage variable frequency drives. It is also extensively used in compensation networks for motor start operations and variable frequency drives.

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