What you're sourcing
The ABB 1SAZ721201R1025 is a thermal overload heater element built for starters, with the auxiliary circuit rated for 600VDC/AC at 50/60Hz — the figure that governs what it sits next to on the panel. It lives in the thermal overload heater family under ABB Contactors and Starters, which means it clips onto the matching starter block and acts as the heater/calibration element that drives the overload's trip curve — not the overload relay itself.