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LSA Protection Magazine


     In line with signal potentials, a distinction is made between 3-point and 5-point protection.

     In case of connection modules, only 3-point protection is possible.

     Switching modules are basically recommended for 5-point protection (components in the signal path) because - once the protective plug has been removed - the contact in the module is open, so that possible faults cannot make their way to the downstream network. 5-point protection can also be implemented using disconnection modules.

    KRONE supplies various types of protective circuits:

􀂄     3-point protection: pure overvoltage protection (high-voltage or secondary protection)

    􀂄 5-point protection: overvoltage protection combined with current protection

    􀂄 5-point protection: graded protection (high-voltage and secondary protection with current protection).


     Protective circuits with an integrated fail-safe feature are highly recommended. Components for overvoltage protection are usually designed for pulse-shaped loads only. Therefore, if permanent overloads are possible (e.g. mains contact), a safe short-circuit to earth must be ensured. Overloaded or overheated protection components would not only lose their protective function, they could cause fire or an explosion thereby leading to considerable damage.

Ningbo Hongyi Telecommunication Equipment Co.Ltd