Super Immunized mA differential 2x40x30 | CHINT NL1-2-40-30ASi

 

How do superimmunized differentials work?

For a differential to jump, the difference between the phase output current and the neutral input current must exceed 30 or 300 milliamps (depending on the differential), which automatically causes the entire electrical circuit to be disconnected. The superimmunized differential manages to avoid these false shots, so that it only jumps when there is a real threat.

As it does? Thanks to the high-frequency filters that it incorporates, the superimmunized differential can distinguish earth faults from a false alarm caused, for example, by lighting with fluorescent tubes. These filters are, in fact, capacitors connected to ground through which permanent leakage currents circulate at 50 hertz, between 0.3 and 1.5 milliamps per device (may vary depending on the type of receiver).

If the sum of permanent leaks reaches 35 percent of the sensitivity of the differential, any small overvoltage -such as that caused by turning on several computers at the same time- can cause a nuisance trip.

For all these reasons, experts recommend installing a superimmunized differential in those installations in which the differential trips too frequently without just cause.

 

The discount applied to the PVP is -82%

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