What the Class 10 trip and 690 V AC-3 rating mean for your motor circuit
The 3RA2125-1AA23-0BB4 is a SIRIUS non-fused motor starter combining a contactor and thermal-magnetic overload in one size S0 package. The magnetic short-circuit trip handles the instantaneous fault. Rated for AC-3 duty up to 690 V, this starter switches squirrel-cage motors — making and breaking the load current during starting and stopping. The 24 V control voltage is common for PLC-driven panels where the control transformer steps down to 24 VDC or 24 VAC. The supplied contactor is a 3RT2023-1BB40, and the supplied circuit-breaker is a 3RV2011-1AA15 — meaning this is a fully coordinated starter assembly, not a loose collection of parts. The link module 3RA2921-1BA00 ties them mechanically and electrically.
Panel fit — DIN rail footprint and mounting clearances
Width is 45 mm, depth is 107 mm, height is 193.1 mm. Mounting position is vertical only. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards. The zero backward clearance means it sits flush against the back panel — no extra space needed behind the DIN rail.