The Siemens 3RB1016-1PB0 is a solid-state overload relay rated for 1.5 to 6.0 A, designed to mount directly onto a contactor in the S00 frame size. The screw terminals accept the motor leads, and the manual-automatic reset selector lets you choose between manual reset after a trip (good for unattended lines) or automatic reset (for remote-reset applications).
Size S00 means this relay snaps onto a matching S00 contactor (e.g., the 3RT20 series) on a DIN rail or mounting plate. The screw terminals are sized for the motor leads in that current band — no special tooling needed. The manual-automatic reset selector is accessible from the front, so a panel builder can set it before the cover goes on, and a field tech can change it later without pulling the relay off the contactor.