Circuit arrangement for protecting interface circuits...

Details Circuit arrangement for protecting interface circuits... Circuit arrangement for protecting interface circuits...

H - Electricity

02

H

H02H 7/20 (2006.01) H02H 9/04 (2006.01) H04M 3/18 (2006.01)

Patent

CA 2085189

ABSTRACT OF THE DISCLOSURE The circuit arrangement protects an interface circuit connected to two-wire subscriber lines against overvoltages occurring on the subscriber lines. The interface circuit has a transformer for signal infeed and/or signal outfeed whose center tap at the line side is at a DC voltage potential. The protection occurs in that the line-side center tap (17, 27) of the transformer (T10, T20) is connected via a fuse element (Si10, Si20) to the DC voltage potential, and in that the connection between fuse element and DC voltage potential is connected to ground via a surge arrestor element (Ts10, Ts20).

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