A.c. power cut-off device

H - Electricity – 02 – H

Patent

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Details

H02H 3/28 (2006.01) G01R 19/165 (2006.01) H02H 3/10 (2006.01) H02H 3/33 (2006.01)

Patent

CA 2217604

A power cut-off device for an a.c. mains having live and neutral conductors comprises a pair of comparators (10, 12) for comparing the voltage drop across an impedence (S1) in the live conductor (L) with a threshold value, and a photorelay (15) responsive to the comparators for turning off a triac (16) to disconnect the live conductor from a load (Z1) if the threshold is exceeded.

L'invention concerne un dispositif pour couper une alimentation en courant alternatif ayant un conducteur sous tension et un conducteur neutre. Ce dispositif comprend deux comparateurs (10) et (12) pour comparer la chute de tension lorsqu'elle passe par une impédance (S1) dans le conducteur sous tension (L) avec une valeur seuil. Un relais optique (15) commandé par les comparateurs coupe le triac (16) pour déconnecter le conducteur sous tension de la charge (Z1) quand la valeur seuil de la tension est dépassée.

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