Electromagnetic release to differ materially from "permanent magnet" release

And the return spring force is always in the state, heating coils, electronic components, easy to aging and early spring weak electromagnetic tripping device failures are fatal  electric meter . With electromagnetic release to differ materially from "permanent magnet" release, only when needed action, the instantaneous power output of the control circuit, the drive coil (pull or release) action, and with a  mcb circuit breaker magnetic fields hold the armature in working position . Therefore, the author designed a permanent magnet based ATtiny microcontroller  circuit breakers  release, the release level in mW power levels can be achieved without fever, high reliability purposes. Permanent magnet-type release existing national standards, the power supply voltage drops to the rated voltage of 70% Ue ~ 35% Ue, the undervoltage release enables circuit breaker tripping.