The 1SVR040000R1700 is an ABB CC-U I/I interface relay — a standard signal converter that takes a 24V AC or 24-48V DC supply and isolates one control signal to another. Rated for 24V AC and a 24-48V DC range, it handles mixed-voltage control cabinets where both AC and DC supplies are present. The DC range is wide enough to cover nominal 24V and 48V systems without a separate model.
The 24V AC and 24-48V DC supply range means this one part covers both common control voltages in industrial panels. If your cabinet runs on 24V AC for older relay logic and 24V DC for the PLC, you do not need two different signal converters — this one bridges both. The DIN-rail mounting keeps panel integration straightforward: clip it on, wire the input and output, and it occupies a single module width.