Electronic Current-Transformers and Measuring Tranducers STWA Detection of AC-current yes/no, with transistor output Measuring transducer 0-15 A, 0-20/100 mA, with analog or frequency output. In the variant with the RS485 (modbus RTU) interface, up to 246 measuring transducers can be connected to one bus input of a controller. In addition, the bus technology reduces the wiring effort. Current sensor S1 for detection yes/no of DC and AC-currents