Electronic trip device with short delay function

A short delay function electronic trip device designed to produce a tripping signal when an input signal, representative of a current flowing in at least one conductor to be protected, is greater than a preset threshold value over a preset time delay period, said trip device comprising:

• comparison means for comparing the input signal and the threshold value and for producing an output signal when the input signal is greater than the threshold value, and
• time delay means connected to the output of the comparison means, wherein the time delay means comprises a counter and an up-down counter each comprising a clock input coupled to receive clock signals of preset frequencies from a clock circuit, a zero reset input of the counter being connected to the output of the comparison means, and the output of the counter being connected to an up-down counting input of the up-down counter in such a way as to trigger its count-down when the content of the counter reaches a first preset value, wherein the up-down counter generates a tripping signal when its content reaches a second preset value.