Locking device handle lock + lock (1 set in a polybag) for 5SL, 5SV, 5TL1 Locking device SENTRON 5ST3 as an additional component for residual current protective 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. Optimum technology for your safety - only from Siemens.