What it is and where it lands
The Siemens SIRIUS 3RV1982-1ED0 is a shunt release — a remote-trip accessory that drops into the front of a 3RV1 motor-protective circuit breaker in frame sizes 6, 7, and 8. It fires the breaker's trip mechanism when you apply a control voltage across its coil, letting a PLC, E-stop circuit, or remote pushbutton kill motor power without anyone walking to the panel. Coil is rated for 110...127 V AC or 110...125 V DC, so it works on common control transformers and battery-backed DC buses in the same voltage window. No separate AC/DC variant to track.
Panel fit and wiring
Snaps onto the front of the 3RV1 breaker — no DIN rail space consumed, no extra enclosure depth. The release sits flush with the breaker face, so gland-plate and fill-factor planning stays unchanged. Terminals accept 0.2–2.5 mm² solid or ferruled stranded. Strip length 8 mm avoids whiskers under the spring cage. Polarity matters on the DC side — free-wheel diode polarity must match coil suppression; verify before energizing.