classic control today replaced with programmable logic control and only very old machines that still work with classic control however learninng classic control is very important
classic control system consist of
relay
relay usually used as interface between plc and contactors
contactors
used to control the power load on and offf, manually or automated by plc or microcontrol or microprocessor
protection parts
fuse
cb
mcb
mccb
rcd
overload
over current relay
over and under voltage