Phoenix contact 3 way isolation amplifiers phoenix contact 2814537 the phoenix contact 3 way isolation amplifier mcr c ui 4 dc is ideal for galvanic isolation and conversion of analogue standard signals and has the following signal ranges input signal 0v 10voutput signal 4 ma 20 ma the amplifier provides electrical isolation of analog standard signals while the module input and output are supplied via integrated dcdc converters which are electrically isolated from the mains 3 way isolat