Patent ID: 9450399
Filing Date: 2016-09-20
CPC Classification: G01F,H02H

Claim Text:
1. An electrical or electronic safety circuit, which is connected via at least one supply line with at least one component connected downstream in an explosion endangered area, the electrical or electronic safety circuit protects the at least one downstream component by monitoring the power supplied via the supply line as a function of the ignition protection type required in the explosion endangered area, wherein the at least one downstream component is operated by clocking in such a manner that its on-time is less than the period of the clocking, the electrical or electronic safety circuit includes: at least one, time triggered crowbar, or time triggered, short circuit switch, said crowbar being so embodied that it monitors the on-time of the at least one downstream electronic component and the period of the clocking and therewith the power supply in such a manner that a predetermined maximum allowable surface temperature of the at least one downstream component in the explosion endangered area is not exceeded; wherein an external control unit is provided, which controls the power supplied via the at least one supply line transferred and monitored by said at least one, time triggered crowbar in such a manner that the on-time of the downstream component is maximum, while the period is minimum, without said time triggered crowbar becoming active and turning the power supply off.