Series QHWK3 Non-contact Magnetism Regulating & Sustaining Controllern This series which adopts non-contact control technology to realize the non-contact control for excitation and demagnetzation of the electromagnet has the function of sustaining magnetism power-cut. If the electricity fails, the standby power supply which has non-contact static switch will shift in quickly and safely and it also has the advantages of magnetism regulating, in other words, it can control the quantity of steel plates to be lifted conveniently through regulate the excitation voltage of the electromagnet, and can even place the plate one by one by pressing the button of placing them separately.