What it is
The 1SAM101904R0003 sits in the Electrical Contactors sub-category under Contactors and Starters, which itself rolls up under Circuit Breakers, Fuses & Protection. The title on record reads 1SAM101904R0003 by ASEA BROWN BOVERI.
Where this class of part goes in the panel
Electrical contactors in this ABB line handle switching duty inside motor starters and control assemblies — the slot a buyer reaching for 1SAM101904R0003 is filling sits next to overloads, breakers, and wiring terminals on the DIN rail. With no functional ratings on file for this specific code, confirm against the manufacturer's datasheet before specifying into a BOM line: the part-number family, not the digits on this page, is what tells you coil volts and contact form.