PLC Amplifier is a relay board used for isolating and amplifying current between PLC and load, so it is also called IO relay board. Its function is to improve the load carrying capacity of PLC and protect PLC from overvoltage, overload, short circuit of load and other faults, which will lead to the damage of PLC host. Specific price, Size, Weight Are subject to Inquiry Competitive brands rexroth, HAGGLUNDS, AVENTICS, Danfoss, Parker, MOOG, sunhydraforce, EOWARDS, Leybold, INFICON ,NSK and other European and American brands.