The Siemens 3RV5902-1DB0 is a SIRIUS shunt release designed to trip a motor circuit breaker remotely — think of it as the remote kill switch for a motor feeder. It accepts a control supply voltage of 20 to 24 V AC at both 50 Hz and 60 Hz, and also works across a wider 20 to 70 V AC/DC range for 5-second energised duty (100% ED at the lower 20-24 V AC band). That dual-range flexibility means you can wire it into a standard 24 V control circuit or a higher-voltage signal without swapping the part. The break time is a maximum of 20 ms, so the breaker opens fast when the shunt coil is energised. Rated for pollution degree 3, it handles the conductive dust and humidity you'd expect in a cement plant or industrial enclosure without creeping or tracking.
This shunt release is sized for SIRIUS circuit breaker frames S00, S0, S2, and S3. That covers the small S00 frame (up to about 16 A motor protection) through the larger S3 frame (up to 100 A class). You mount it directly onto the breaker's side — the snap-on feature locks it into place without screws, and the screw terminals accept the trip signal wiring. A cement kiln control room at 50 °C ambient is well within the operating window. The closing power at DC minimum is 13 W, so verify your control transformer can deliver that inrush if you're running a long DC signal loop.
The part carries a substance prohibitance date of 05/01/2012, aligning with RoHS and REACH compliance milestones. The reference code per EN 61346-2 is F (protective switching device). It is designed for use with motor circuit breakers and includes a fuse-based short-circuit protection design.