Pin busbar, 16mm2 Connection: 4x 3-phase according to UL 489,480Y/277V for LS 5SJ4...-.HG pin busbar SENTRON 5ST3 as an additional component for residual current protective devices and circuit breakers.These additional components can be installed universally. They are easy and convenient to install and connect. Thanks to the standard touch protection, safety during installation is reliably guaranteed.Optimal technology for your safety - only from Siemens.