초록 ▼

An overcurrent trip device includes a capacitor 13 that stores power for driving a trip electromagnet 7, and a charging current generating means 18 that starts charging the capacitor 13 upon detection of an overcurrent and that completes the charging of the capacitor 13 until a trip control circuit

An overcurrent trip device includes a capacitor 13 that stores power for driving a trip electromagnet 7, and a charging current generating means 18 that starts charging the capacitor 13 upon detection of an overcurrent and that completes the charging of the capacitor 13 until a trip control circuit 5 outputs a trip signal. The operation of the trip electromagnet 7, which is driven with the charges of the capacitor 13 by causing a thyristor 12 to be turned on by the trip signal, is continued until the charges of the capacitor 13 are lost, and even after the power supply from a rectifying circuit 4 is stopped due to the opening of a circuit breaker 8, it is made impossible to reset and re-close the circuit breaker 8 for a predetermined time.

대표청구항 ▼

[ What is claimed is:] [1.] An overcurrent trip device that monitors a magnitude of a current flow through an electric circuit at all times and drives a trip means after a predetermined delay time has elapsed upon judgment of an overcurrent, said device comprising:electric charge storage means for d

[ What is claimed is:] [1.] An overcurrent trip device that monitors a magnitude of a current flow through an electric circuit at all times and drives a trip means after a predetermined delay time has elapsed upon judgment of an overcurrent, said device comprising:electric charge storage means for driving the trip means and storing power to hold the operation of the trip means for a predetermined time; andcharging current generating means for outputting a charge current to the electric charge storage means so that said electric charge storage means completes storage of electric charges between occurrence of the overcurrent and the elapse of the delay time, wherein said charging current generating means includes a plurality of transistors coupled to the electric charge storage means and connected to conduct the charge current in parallel.