What it is
The ABB 1SAZ321401R1001 is a solid state overload relay listed in the 18-25 A current range — the electronic, no-heater style of motor overload element that sits beneath a contactor or breaker in a motor protection circuit. It carries ABB part number 1SAZ321401R1001 and ships as a standalone module within the Relays / Solid State Overload Relays class. In a panel build it does the same job a thermal overload relay does — sense motor current and trip the contactor on sustained overload — but with electronic sensing rather than a bimetallic strip, so the trip curve is set in firmware rather than by a heater pack. Sourcing it against a BOM line is typically a replacement-for-failed or line-down spare play; it is not a parametric selection where buyers shop multiple brands.
Sourcing reality
Compliance documentation is not listed in the evidence for this MPN; confirm declarations through the RFQ when the BOM line is bound to a specific certification requirement.