ERZ-E05A221

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TVS (Transient Voltage Suppressors) and Varistors (Voltage Dependent Resistor) are two most commonly used devices to provide protection from transient voltage surges and electrical noise. Television Equipment Supplies ERZ-E05A221 is a type of Varistor, also known as a Voltage Dependent Resistor (VDR). It is a non-linear device used to protect equipment against transient overvoltage conditions. ERZ-E05A221 is especially suited for military and industrial applications, due to its performance in the high-voltage range.

Application Field

ERZ-E05A221 is an excellent solution for transient protection due to its high energy capability (up to 4.5J) and the ability to withstand high voltage surge. This makes it especially suitable for applications such as:

• Lightning protection for buildings and communication equipment
• Powerline overvoltage protection
• Telecom overvoltage protection
• Industrial equipment overvoltage protection
• Military applications and low noise EMI/RFI circuit protection.

In general, ERZ-E05A221 is capable of handling surges with peak voltages up to 5000V and 25A (when pulse duration is 8.3 milliseconds). It is also UL recognized.

Working Principle

The ERZ-E05A221 uses a metal oxide (MOV) element combined with a ceramic layer for surge suppression. The metal oxide element functions as a resistor to restrict current flow and the ceramic layer helps to absorb it. When the voltage across the element surpasses its threshold (clamping) voltage, the device becomes conductive and a surge of current is limited thus protecting against destruction.

The working principle of MOV varistors can be simplified to three steps. Firstly, the current flows through both the ceramic layers which protect the device from the high voltage of a surge. The second step is when the voltage rating of the surge is exceeded; then the MOV element allows the current to flow through it. Finally, the voltage drops down to below the triggered voltage.

The ERZ-E05A221 TVS has low capacitance and can effectively limit the voltage on the circuit. This helps to protect sensitive circuits against electrical transients and noise, resulting in improved system reliability.

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