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ABB REF542 Plus HMI Interface. The ABB REF 542plus feeder terminal is a compact digital bay control technology solution. It can be used for many different medium voltage applications such as feeder protection, transformer protection and motor protection. The feeder terminal REF 542plus, like its predecessor REF 542, integrates measurement, monitoring, protection, control and self-diagnosis functions in one package. With its integrated communication protocol, REF 542plus can be easily integrated into any substation automation system of ABB or third parties. Compared with more traditional methods, these new generation devices have excellent flexibility and scalability, thus providing smart, clean solutions. This software solution allows you to use REF 542plus in all ABB’s main air and gas insulated switchgear solutions