What this SIRIUS motor starter delivers
The 3RA2125-1BA23-0AP6: This is a Siemens SIRIUS 3RA2 non-fused direct starter — a factory-assembled combination of a contactor and a thermal-magnetic overload relay in one S0-size housing. The unit ships with the 3RT2023-1AP60 contactor and the 3RA2921-1AA00 link module pre-wired — no separate assembly of the overload relay onto the contactor. The magnetic short-circuit trip handles fault clearing; the bimetallic thermal element tracks motor heating for overload protection.
Panel fit and mounting constraints
Width is 45 mm, depth 97.1 mm, height 193.1 mm — the S0 footprint fits standard 45 mm-wide feeder slots in Siemens SIRIUS panels. Mounting position is vertical only; the upward clearance needed is 30 mm, forward 10 mm, downward 10 mm, and 9 mm at the side. Backwards clearance is zero — the housing sits flush against the backpanel. Operating temperature range is -20 to +60 °C, storage -50 to +80 °C, transport -55 to +80 °C. Pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation — no additional enclosure derating needed for typical panel conditions.
Motor power coverage across common voltages
Rated motor power is 750 W at both 400 V and 500 V, 1 100 W at 690 V. Current draw at 480 V is 1.63 A, at 600 V is 1.72 A — these are the AC-3 values that govern contactor and overload sizing for the motor branch circuit. Operating frequency is 50 to 60 Hz; the control coil voltage range is 176–242 V at 50 Hz and 192–264 V at 60 Hz.
Sourcing and lifecycle — active, quoted to order
For a line-down spare or a new panel build, the 45 mm width and S0 size mean it drops into any existing SIRIUS feeder slot without re-drilling the backpanel. Confirm the control voltage range (176–264 V AC) matches your control transformer tap before committing the BOM line.