AS-i Overvoltage Protection for Harsh Environments
The Siemens 3RK1901-1GA00 is an AS-Interface overvoltage protection module designed to shield AS-i networks from surge events, rated for lightning protection zone 2. It carries a 10 kA core-to-PG surge capacity and a 0.5 kA core-to-core rating, clamping transients on the AS-i bus line before they reach connected slaves or the master. Rated IP67, the module withstands washdown and high-humidity environments — suitable for food-and-bev lines, car wash tunnels, or outdoor conveyor sections where moisture ingress is a risk. The module does not require its own AS-Interface address — it sits transparently on the bus, clamping overvoltages without consuming a node slot or adding configuration overhead.
The 3RK1901-1GA00 is a phased-out product. Siemens no longer manufactures this exact variant; the listing carries a note directing inquiries to sales for further information.
Integration and Environmental Fit
Dimensions of 25 mm depth, 45 mm width, and 80 mm height keep the module compact enough for crowded DIN-rail assemblies — it occupies roughly the same footprint as a single SIRIUS contactor of size S00. The overvoltage detection function is built in, but ground fault detection is not present — the module handles differential and common-mode surges on the AS-i pair only, not leakage-to-earth faults on the bus cable.