Auxiliary contactor, 53E, DIN EN 50011, for railway applications 5 NO + 3 NC, screw connection, operating range 0.7...1.25xUS with varistor connected DC 24V Auxiliary contactor 3TH4 for switching the control signals in the control circuit. The 3TH4 auxiliary contactors have standard connection designations and reliable connection technology. By multiplying the outputs, it is possible to switch up to 10 auxiliary circuits simultaneously. The contacts are also available as SUVA versions with positive guidance for safety applications. The devices are climate-resistant, have a high level of contact reliability and are suitable for worldwide use thanks to the corresponding approvals (e.g. IEC and UL/CSA). The 3TH4 auxiliary contactors are available in AC or DC operation in various versions with 8 or 10 poles. Accessories include surge limiters, delayers and coupling elements.