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How are the low-voltage surge protection levels classified for intelligent low-voltage monitoring units?

Time：2026-01-21 Views：507次

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The low-voltage surge protection is designed with a tiered discharge system based on energy levels.

The first tier (input line): uses a 2R090L-5.5×6 gas discharge tube (90V/3kA).

The second tier (equipment inlet): uses a 7D390K varistor (390V/2kA) paired with a CMZ3225A-501T common-mode inductor.

The third tier (board level): uses an SMBJ18CA TVS diode (18V/600W).

The fourth tier (chip level): uses an ESD5V0D8B.

Inter-tier coordination: decoupling is achieved through inductors or resistors.

Through this tiered design, the system can withstand 3kA surges with 8/20μs waveforms.

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