Protective relay

Details Protective relay Protective relay

H - Electricity

02

H

H02H 11/00 (2006.01) H02H 9/02 (2006.01)

Patent

CA 2420421

A protective relay is provided to protect circuitry against reverse battery polarity or load dump, wherein a relay coil is operatively connected to a contact switch and is fed by a reverse bias diode (which may be a Zener diode) such that the relay coil opens the switch contact when the diode is energized to protect the circuitry; wherein the protective relay optionally includes a positive temperature coefficient resistor or a current resource to protect the relay coil from overheating.

L'invention porte sur un relais de protection de circuits contre une inversion de polarité d'une batterie ou une surtension dans lequel la bobine est fonctionnellement reliée à un contacteur et alimentée par une diode à polarisation inverse (par exemple de Zener) de manière à ce que ladite bobine ouvre ledit contacteur lorsque la diode est sous tension, pour protéger les circuits. Le relais peut comporter facultativement une résistance à coefficient de température positif, ou une ressource en courant, le protégeant contre les surchauffes.

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