What it is
The ABB 1SAZ321201R1005 is a thermal-trip element in ABB's thermal-overload-heater family, intended to fit the matching ABB starter assembly and provide the bimetallic overload protection that pairs with a contactor in a motor-starter circuit. It sits inside the contactors-and-starters sub-family of thermal overload heaters for starters, which is the slot a starter panel builder reaches for when an overload block has to be specified into a starter combination.