Pin busbar, 16mm2 Assortment with: 20x 5ST3643+10x 5ST3644+ 50x 5ST3645+10x 5ST3655 Pin busbar SENTRON 5ST3 as an additional component for residual current protective devices and circuit breakers. These additional components can be mounted universally. They are easy and convenient to install and connect. Thanks to the standard touch protection, safety during installation is reliably guaranteed. Optimum technology for your safety - only from Siemens.