The Siemens 3RB1016-2NB0 is a solid-state overload relay in the SIRIUS 3RB1 family, rated 0.4...1.6 A with a Class 20 trip curve. It mounts directly onto a contactor in Size S00, using screw terminals. The manual-automatic reset gives the commissioning engineer a choice: leave it on auto for remote restart, or switch to manual for troubleshooting a motor branch that keeps tripping.
The 0.4...1.6 A range covers small motor loads — fractional-horsepower pumps, fans, or conveyor drives. Class 20 means the relay allows up to 20 seconds at 600% of the set current before tripping, which is standard for general-purpose induction motors starting across the line. The Size S00 footprint matches the smallest Siemens contactor frame (e.g., 3RT201), so it snaps on without extra DIN-rail space. Screw terminals are the workhorse connection for panel builders who prefer a screwdriver over a cage-clamp tool.
Deployment context
No separate base or wiring adapter is needed — it clips onto the contactor's frame and connects through the load-side terminals. The solid-state design means no bimetal drift over time, which matters for applications where the trip point must stay repeatable across temperature cycles.