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Feed Through Capacitors

Feed through capacitors are those capacitors which pass a very low frequency AC current through them while blocking DC current. They are used to create a filter for low frequency signals while still allowing high frequency signals to pass through. The most common type of feed through capacitor used is the PSM4-821M-20T2.

PSM4-821M-20T2

The PSM4-821M-20T2 is a motorized feed through capacitor designed to handle a wide range of applications. It is primarily used in large household appliances, industrial machines, and data centers. It is a very durable and versatile capacitor, capable of operating at temperatures of up to 105°C and capable of blocking frequencies as low as 100Hz. The PSM4-821M-20T2 is also RoHS compliant and is UL listed.

Application Field

The PSM4-821M-20T2 is a very versatile capacitor and its application field is very broad. It can be used in nearly any application that requires the use of a feed through capacitor. These applications include high current DC transient noise suppression, i.e. DC/DC converters or variable frequency drives found in large commercial and industrial applications. It can also be used in medium voltage AC motor drives and is ideal for filtering out low frequency noise, such as motor noise, in both AC and DC applications.

The PSM4-821M-20T2 is also well suited for use in transformers due to its wide operating temperature range and its ability to handle high current AC and DC transient noise. It is also often used in telecommunications equipment, such as modems, which require a reliable and efficient filter against low-frequency noise. In addition, it is also commonly found in medical equipment where reliable and efficient filtering is required.

Working Principle

The PSM4-821M-20T2 feed through capacitor operates on the principle of capacitance. The capacitor is made up of two concentric metal plates, one of which is connected to a conductive trace while the other is connected to ground. When a voltage is applied to the capacitor, the electric field between the plates will cause a current to flow. This current is known as a capacitive current. The amount of current that can pass through the capacitor is determined by its capacitance.

The PSM4-821M-20T2 is designed to pass low frequency AC signals while blocking DC signals. This is accomplished by using a dielectric material between the plates which allows AC signals to pass through but blocks the passage of DC signals. This will allow the capacitor to filter out any unwanted low frequency noise while still allowing high frequency signals to pass through.

The PSM4-821M-20T2 is a great solution for anyone looking for a reliable and efficient feed through capacitor for use in applications that require filtering of low frequency noise. It is a durable and versatile capacitor that is capable of handling high current DC and AC transient noise and is RoHS compliant and UL listed.

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