OVERCURRENT PROTECTIVE DEVICE

摘要

An overcurrent protective device of the time delay type is provided which is responsive to the current in an electrical circuit which is being protected. The protective device includes means for producing periodic output pulses of current each having substantially a predetermined width or duration, the frequency and magnitude of said pulses both varying with the current to which the device is responsive. When the current in the associated circuit increases to a predetermined level or value, the pulses are applied to a timing or integrating capacitor to provide an output voltage which varies in a substantially linear manner with the square of the current to which the protective device is responsive.