The Siemens 3RT1344-1AK60 is a SIRIUS power contactor in the S3 frame size, rated for motor switching up to 42 kW at 230 V in AC-3 duty — that's the number that decides whether it handles your conveyor or pump motor without derating. It carries a 1000 V insulation voltage rating, so it's comfortable on 400 V and 480 V line supplies with headroom. The screw-type main terminals accept stranded cable up to 2x 50 mm², which is heavy enough for the full rated load without a separate terminal block. It's built for panel mounting: screw it down or snap it onto a 35 mm or 75 mm DIN rail.
DC Switching and Coil Ratings
This contactor has defined DC switching capability across several voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These are the DC-1 resistive load ratings — if you're switching DC motor fields or solenoid banks, these numbers tell you the current you can break without welding the contacts. The AC coil operates at 50 or 60 Hz, 110 V or 120 V respectively, with a tolerance range of 0.8 to 1.1 times rated voltage.
Main circuit connections are screw-type terminals. Solid wire accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²). Stranded cable goes up to 2x (10 to 50 mm²). The auxiliary and coil terminals handle solid or stranded 2x (2.5 to 16 mm²). For AWG, the main contacts take 2x (10 to 1/0). That covers everything from control wiring to motor feeder cable without adapters.
The contactor carries a substance prohibitance date of 05/01/2012, which aligns with RoHS and REACH compliance timelines. The 1000 V insulation voltage supports standard IEC 60947-4-1 coordination for motor starters.