INSTA contactor with 4 normally open contacts for AC 230V, 400V 40A control AC 24V Siemens switching devices for applications in residential buildings, commercial buildings and industrial applications. The innovative switching devices from Siemens are an important part of the SENTRON components for electrical installation. With the remote switches, switching relays, Insta contactors and timers, they offer numerous options for implementing various switching functions. Whether for residential buildings, infrastructure or industrial applications, Siemens offers the right portfolio for all switching functions. So you have the right device for every requirement! The switching devices from Siemens are characterized above all by: 1. Convenient and simple assembly and connection technology. 2. Reliable safety during installation thanks to standard touch protection. 3. Extensive and easily mountable accessories. 4. Optimum technology for your safety - only from Siemens.