Siemens 3RT1344-1BB40 is a Sirius power contactor for AC-1 duty, featuring four main poles with four normally open contacts and a 24 V DC coil. It is rated for 110 A on the main circuit, packaged in size S3 with screw terminals for the main connections. The contactor supports an insulation voltage up to 1000 V and a surge voltage resistance of 6 kV, with IP20 protection on the front and IP00 at the terminal block. Mechanical life is specified around 10,000,000 switching cycles, making it suitable for frequent motor and inductive-load switching in control panels that rely on 24 V control circuitry.
