The Emphatec DC Plus - CLS/1 module was designed to be used between a 24Vdc power supply and a 2 or 3 wire 4-20mA transmitter. The module delivers 24Vdc to the loop while providing overcurrent protection - if the current exceeds 30mA, most likely due to a short circuit, the output of the module switches off. This means only the short circuited loop is disabled, the 24Vdc power supply continues to operate. The module will automatically reset after the fault is cleared. The module also provides overvoltage protection and reverse polarity protection. Like several other Emphatec products intended for 4-20mA loop applications, the module includes a make-before-break test jack. This allows an ammeter to be quickly and easily inserted and removed from the loop without the need to operated switches or disconnects.