The QUASAR S4e line of electronic interlockings forms the basis of CAF Signialling solutions.

Developed as an SIL4 system according to the ENELEC set of standards for the railways industry, the QUASAR S4e series provides robust 2oo3 archictecture throughout the whole control chain.

Unlike most interlockings available on the market, the QUASAR S4e series offers a full two out of three architecture, not just the main processor elements, but also throughout all of the control electronics, down to the field devices. Inputs coming from field equipment are acquired via three independent input channels.