The Siemens 3TC series is a contactor, size 2,2 pole, with auxiliary contacts 2 NO + 2 NC. It is a dc operating contactor used for switching dc voltage. The 3TC DC contactors offer convincing performance from a compact design with high contact reliability. They are also characterized by their particularly long switching endurance. The devices are approved for worldwide use (e.g. IEC and UL/CSA).

They are available with AC and DC operation, in various voltages and with different auxiliary contacts
Arc chambers, solenoid coils and surge suppressors, for example, are available as accessories