REVO S 1-2-3PH (30,35 and 40A) With Heater Break AlarmREVO SSR with Heater Break AlarmREVO SSR Analog with Heater Break AlarmThe REVO S/SSR units must have: “X” on the Digit number: “12” to allow flat wiring system.This wiring solution let you save:N°2 Wires per Units for the Aux Power Supply (necessary with HB Alarm or Analogue Input Option).N°2 Wires per Unit to Collect Common HB Alarm Output.N°2 Wires per Unit to Activate Calibration from the Integrated Push Button or DI.Screw Terminal Blocks for External Power Supply, Common Digital Input and Common Relay Output.Frontal Push Button For Calibration of all the units.