Isolators, Converters & Spilitters SEM1000 – (4 to 20) mA current Loop Isolator. SEM1010 – Provides Isolated Power For A Transmitter, Derived From A Powered Loop. SEM1015 – Loop Powered Voltage to Current convertor / Isolator. Converts DC voltage to an isolated (4 to 20) mA signal. SEM1020 – 4 to 20mA loop booster. Isolating current loop booster. SEM1200 – Passive (4 to 20)mA Loop Splitter. Isolating current loop booster. SEM1300 – DIN Rail Mounted 24 VDC Power Supply. Cool operating 24 VDC power supply. Posted in Status Instruments