Auxiliary/fault signal switch 5ST3 COM, 0.5 TE for LS, FI, FI/LS, AFDD ON/OFF switch 5TL1 Remote operator Power supply DC 24V Please note radio approval! List of countries: see certificates Auxiliary/fault signal switch 5ST3 COM SENTRON 5ST3 COM as an additional component with communication function for residual current devices and circuit breakers.These additional components can be mounted universally. They can be installed and connected easily and conveniently. Thanks to the standard touch protection, safety during installation is reliably guaranteed.Optimal technology for your safety - only from Siemens.