4702-003MLF

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Feed Through Capacitors are devices which are used to impart a degree of electrical isolation to electrical circuits. The device contains an isolated terminal, which connects to the input signal and a ground terminal, which provides a corresponding ground connection. These capacitors provide a solution for electrical circuits which require isolation, such as audio circuits, EMI filters and remote control systems.

The 4702-003MLF application field Electromagnetic Compatibility (EMC) leakage currents in signal and power lines, such as industrial monitor line, where EMC filter is required. Its working principle is based on the Damped Waveguide Model (DWM) theory, which states that energy from an input circuit is reflected back when an isolated element is present in a transmission line. This principle can be seen in action when a 4702-003MLF capacitor is placed in line between a signal source and load.

The 4702-003MLF capacitor is composed of two sections, the initial filter section and the secondary filter section. The initial filter section is designed to reduce any potential EMI leakage from the devices connected to the signal line by use of an EMI filter capacitor. It is the main function of the EMI filter to reduce EMC leakage. On the other hand, the secondary filter section is designed to further reduce the EMI leakage current and to add a certain amount of electrical isolation. This is done by placing another EMI filter capacitor on the line after the initial filter section, even closer to the load.

In addition to the EMI filter, the 4702-003MLF capacitor also contains an electrical isolation element, which serves two purposes. Firstly, it prevents the transformer action between the signal source and load, making sure that only one side of the capacitor is connected to each device in the signal line. Secondly, it ensures that the leakage current between the two sides is kept as low as possible. This also adds a certain degree of isolation to the signal lines, preventing any noise or interference from entering the line.

In summary, the 4702-003MLF application field and working principle offers an effective solution to the problem of EMC leakage currents in signal and power lines. It combines two components, an EMI filter and an electrical isolation element, which work together to provide electrical isolation, whilst preserving signal integrity and preventing noise and interference from entering the line. In addition, its simple and low cost construction makes it an ideal choice for most modern industrial applications.

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