The Siemens 3RB1016-2RB0 is a solid-state overload relay rated 0.1 to 0.4 A, Class 20 trip curve, sized S00. It mounts directly onto a contactor and uses screw terminals for connection. The manual-automatic reset means you can set it to auto-reset after a trip or require a manual push-button reset — a decision that depends on whether the downstream process can restart unattended.
The 0.1 to 0.4 A range covers small motor loads — fractional-horsepower pumps, fans, or conveyor drives on a 24 V or 120 V control circuit. Class 20 means the relay allows up to 20 seconds of locked-rotor current before tripping, which matches standard NEMA design B motor starting profiles. If your motor has a shorter acceleration time, a Class 10 relay would trip faster; if it's a high-inertia load, you might need Class 30. This one sits in the middle.
Integration notes
The screw terminals accept standard ferruled or solid copper wire; strip length and torque values follow the manufacturer's terminal marking. The relay body clips onto the contactor without additional DIN-rail space — one less thing to plan in the enclosure layout.