Magnetically attachable electromagnetic switch and armature plate capable of increasing a disconnection speed

A magnetically attachable electromagnetic switch capable of increasing a disconnection speed comprising:

• a coil assembly having an induction coil, and an iron core installed along an axial direction of the induction coil;
• a bracket assembly having a fixed plate and an elastic part, wherein at least one side of the fixed plate is provided on the coil assembly and the at least one side of the fixed plate has a section beyond the coil assembly to form an extension end, the elastic part is disposed on the fixed plate, and an end of the elastic part and the fixed plate are fixed to each other;
• a magnetic pole assembly having an armature plate and a contact conduction part, the contact conduction part being fixed to a side of the armature plate for a synchronous movement, the contact conduction part having at least one movable contact, an upper edge of the armature plate being pivoted to the extension end of the fixed plate and being fixed to another end of the elastic part, such that the armature plate being situated in an ON position under a pulling action of the elastic part when the coil assembly is in an electrically disconnected status, and when the coil assembly is situated at an electrically connected status, a magnetic force is generated to drive the armature plate to pivot towards the iron core so that the armature plate being situated in an OFF position, wherein an air gap spacing is defined between the armature plate and the iron core, and when the armature plate is situated at the ON position, the air gap spacing gradually increases from the upper edge of the armature plate to a lower edge of the armature plate;
• and
• a fixed contact assembly having a base and at least one fixed contact disposed on the base, the base carrying the coil assembly, the at least one fixed contact being configured to be corresponsive to the at least one movable contact, and the at least one movable contact contacting the at least one fixed contact to define the electrically connected status when the armature plate is situated at the OFF position,
• wherein the armature plate is provided with at least one demagnetization opening formed on an end side of the armature plate opposite a side where the armature plate and the fixed plate are pivoted to each other.