Undervoltage release AC 230V, with 2 terminals for miniature circuit breakers 5SL4, 5SY, 5SP FI/LS 5SU1, FI 5SV (for 5SU1, handle connector 5ST3805-1 is required) Undervoltage release SENTRON 5ST3 as an additional component for residual current protective devices and miniature circuit breakers. These additional components can be installed universally. They can be installed and connected easily and conveniently. Thanks to the standard touch protection, safety during installation is reliably guaranteed. Optimum technology for your safety - only from Siemens.