The Siemens SIRIUS 3RV1902-1AG6 is an undervoltage release for the SIRIUS 3RV1 circuit-breaker family. It trips the breaker when supply voltage drops below its operating threshold, protecting motor circuits from undervoltage conditions that can cause stalled rotors or uncontrolled restarts. The front is finger-safe to IP20 per IEC 60529, meaning accidental contact during panel access is prevented — standard for control-panel components mounted behind a door.
Lifecycle and Sourcing Reality
This part carries a lifecycle stage of 'current' but the description explicitly marks it as a phased-out product. The official successor is the SIRIUS 3RV2 series — same form factor and function, but the exact order code for the replacement should be verified against the panel BOM. For existing installations or BOM lines that require the 3RV1902-1AG6 specifically, it is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time.
Integration Note
Mounts directly onto the SIRIUS 3RV1 circuit breaker via the accessory slot — no additional wiring required beyond the release coil connections. The IP20 finger-safe front means it can be installed in a standard IP20 enclosure without needing a separate cover over the release. Panel builders should note the 100 V operating coil; verify control transformer taps before commissioning.