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ABB REF542PLUS | REF542 Plus | HMI Unit Black style.The REF542 plus consists of two parts, a Central Unit and a separate Human Machine Interface (HMI) as the Control Unit. The Central Unit contains the power supply, processor and analog and binary Input and Output (I/O) modules, as well as optional modules for supplementary functions. The HMI Control Unit is a stand-alone unit with its own power supply. It can be installed on the Low Voltage (LV) compartment door or in a dedicated compartment close to the Central Unit. The HMI is normally used to set the protection parameters and to locally operate the switching devices in the switchbay. An isolated and shielded twisted pair according to the RS485 standard interface shall be used for the connection of the HMI as the Control unit to the Central Unit.Click to learn about related products: CONTROLLER UNIT, REF542PLUS SUE3000 HMI Unit White 、 REF615

The figures below show the dimensions of the HMI Control Unit and Central Unit.   The REF542 bay control and protection unit does not require special shipping protection.The packaging is adapted for the shipping type and destination. 

Dimension of the HMI Control Unit

Dimension of the Central Unit case, standard version

Dimension of the Central Unit case, wide version

Installation in LV panels：

REF542plus installed in gas-insulated switchgears (GIS)：