Patent ID: 6747856
Filing Date: 2004-06-08
Classification: H02H

Abstract:
A device for protecting against fault currents, comprising:a total current converter; a triggering arrangement; a triggering relay of a triggering circuit, for activating a switching mechanism which switches a conductor network, wherein a converter core of the total current converter for sensing low-frequency and high-frequency fault currents, is formed from at least one of nanocrystalline and amorphous material; and an RC element, formed by a series arrangement of a resistor and a capacitor and connected in parallel at an input end of the triggering arrangement, wherein the capacitance of the capacitor is dimensioned such that a triggering fault current lies at least up to a fault current frequency of 1 kHz below a predefined limiting curve for ventricular fibrillation in accordance with Rule IEC 479, and wherein a value of the resistor is dimensioned such that, even at fault current frequencies of up to approximately 20 kHz, the triggering fault current lies below a limiting curve which is acceptable for avoiding fires.