... ,then magnet will lift the steel plate or iron billets firmly.c.When we turn on the droping switch ... dropping of the coil,aslo will speed up the iron billets dropping,about 1~2 second later,(adjust KT), ... dropping contactor is power off,then all the iron billets or plate will drop.Technical Feature a. Products ... if you find magnet can not drop the iron scrap completely or be lifted agian after the ...