ELF-24V025A

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Common mode chokes are devices used in electronics or electrical engineering that provide a path for electric current, while blocking the flow of alternating current. Common mode chokes are used in a variety of applications, including data transmission, radio, power electronics, and automotive electronics. The ELF-24V025A is a common mode choke used in power electronics, specifically for protection against over-voltage and voltage transient events. It is a high-power (20A-rated) filter that can filter differential-mode and common-mode noise in the power line.

The design of the ELF-24V025A is based around two internal inductors in a dipole configuration and two pairs of energy-absorbing diodes. The two inductors act as a high pass filter, blocking frequencies below 25MHz (the common mode choke has a 3dB point of 25MHz). The ELF-24V025A also includes two pairs of diodes, placed in parallel in order to absorb any energy that is not blocked by the inductive filter. The diodes provide a path for the current to flow without passing through the inductors.

The ELF-24V025A can be used in several different types of applications. The most common application for the ELF-24V025A is to filter interference from high voltage transients typically found in power supply lines, usually in response to an emergency shutdown of the source. Additionally, it can be used to reduce Audio-Frequency Interference (AFI) in audio signals, and to reduce or eliminate EMI outside the range of the filter. Generally, this unit is used in telecommunications, automotive electronics, and household appliances.

The ELF-24V025A is constructed from UL-certified materials, and is operable from -55 to +125 degrees Celsius, over an operational temperature range of -55 to +125 degrees Celsius. The unit also has a storage temperature of -55 to +185 degrees Celsius, making it suitable for use in extreme temperatures. The ELF-24V025A is also UL approved for safety and meets all relevant IEC safety standards.

The working principle of the ELF-24V025A is straightforward. As current in the power line passes through the two inductors, frequencies below 25MHz are blocked, while frequencies above 25MHz are passed through the filter. At the same time, the two pairs of diodes absorb any energy that is not blocked, protecting the equipment from damage that could be caused by over-voltage or transient events. This ensures that all frequencies in the power line are kept below a safe level and that any interference in the line is reduced or eliminated.

In conclusion, it can be seen that the ELF-24V025A is an ideal choice for filtering out high voltage transients and other interference in power supply lines. With its UL-certified construction, operational temperature range, and safety certifications, as well as its dual-stage filtering principle, the ELF-24V025A provides a reliable and efficient solution for protecting equipment from over-voltage and transient events.

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