Circuit device using this high-current resistor and a variable high-current resistor is used as a protective element in power switching technology, especially

摘要

(57) for application as a protective element in [Abstract] power switching technology, which has carbon as a resistance material, the variable high-current resistance present the interface with the junction region of the conductor of the other already proposed case have. This resistance is kept low resistance in the junction region by applying a pressing force. Resistance moves to a high resistance state by the current heat in the conventionally known techniques. Pressure of the variable high-current resistor can be controlled to suit the purpose according to the invention, the first predetermined order (11) sets a low-resistance state of the resistance layer containing soot and carbon and / or when the is pressed in (12, 13) conductor by a force with a value of, the pressing force is reduced to the value of the second in a short period of time sufficient to short circuit, resistance in (15) junction area is increased at least two orders of magnitude at this time. (10) can be applied in conjunction breaker, power semiconductor device, a vacuum circuit breaker and magnetic contactor variable high-current resistor such.