Wago 3 way isolation amplifiers current or voltage signals wago 857 411 the wago 3 way isolation amplifier input signal 0 4 20ma output 4 20vma is a high quality amplifier fixed for current signals firmly adjusted the 6mm amplifier is not only characterised but also offer constantly bridgeable connections for supply voltages that are always at the same position that means simply bridging instead of individual wires offers galvanic separation all inputs outputs and supply circuits