What it is and what it does
The Siemens SIRIUS 3RS7020-1ET00 is a passive single-range signal converter that takes a 4...20 mA input and reproduces it as a 4...20 mA output, with galvanic isolation between the two paths. Rated precision is 0.1 % relative, with a temperature drift of 0.015 %/°C, so the loop stays accurate across a panel's thermal swing. Settling time to 1 % of final value is 6 ms, fast enough for most process signals but not for high-speed control loops.
Panel fit and wiring
Snap-on mounting to a 35 mm DIN rail, 6.2 mm wide — one of the narrowest signal-conditioning slices in the SIRIUS family, so it fits tight gland-plate layouts. Screw-type terminals accept 1 x (20...14) AWG solid wire. No special tooling needed, and the 71 mm depth leaves room for wiring in a standard 80 mm deep enclosure. Mounting position is unrestricted, and the operating range is -25 to +60 °C with 10...95 % relative humidity — fine for most indoor panel environments.
Electrical characteristics that matter
The input voltage is 30 V, with a voltage drop of 4.1 V at the operating equipment. Maximum voltage ripple on the supply is 5 mV. Output can drive up to 1000 Ω load at the current output maximum — enough for a long cable run or a multi-device loop. Galvanic isolation is rated for 1500 V surge voltage, with isolation between input and output. No isolation between multiple inputs or outputs — this is a single-channel device.