The Siemens Contactor, AC-1, 40 A/400 V/40 °C, S0, 4-pole, 230 V AC/50 Hz, 1 NO+1 NC, screw terminal Contactor SIRIUS 3RT23 for switching resistive loads. The comprehensive range of accessories, such as auxiliary switches, auxiliary releases etc. is standardized for all sizes Simple, efficient and always up to date - SIRIUS modular system