Ningbo Jinsun Magnetoelectric Technology Co., Ltd. Manufacture a wide range of holding electromagnets and Solenoid. According to different function, electromagnet has two categories: Standard electromagnet and permanent electromagnet. Standard electromagnet has magnetic field on the contact surface when its coil is connected to electric current, so it can hold ferrous materials; When it's disconnected with electric current, magnetic field disappeared and it release object. It's ON to hold and OFF to ...