Phoenix contact 3 way isolation amplifiers phoenix contact 2814524 the phoenix contact 3 way isolation amplifier mcr c ii 40 dc is ideal for galvanic isolation and conversion of analog standard signals and has the following signal ranges input signal 4 ma 20 maoutput signal 0 ma 20 ma the amplifier provides electrical isolation of analogue standard signals while the module input and output are supplied via integrated dcdc converters which are electrically isolated from the mains 3 w