Tag: protection

All electrical equipments have their rated power. It is called overload when they surpass the rated power, and protection to the status is called overload protection. Protection to prevent internal short circuit of electrical equipment is called short circuit protection and zero-pressure is also called no-voltage protection. When there is power failure, circuit with the functions mentioned above will stop automatically and electric equipment will not start automatically when power is supplied next time. the purpose of the function is to prevent operating personnel forget cut off power source when there is power failure and electric equipment operate automatically next time when there is power and thus cause accidents. General contractor-controlled circuit has this function.