Toshiba GRB100 busbar protection is now available for applications with up to 64 feeders. In addition the upgrade includes IEC 61850 compliant communication. Toshiba launched their first numerical busbar protection in 1986 and GRB100 provides proven features alongside advanced protection algorithms. GRB100 offers discriminating and check zone protection with percentage restraint characteristics and features sub-cycle operation, CT saturation countermeasure and an optional supervisory element. It has a proven track record in Europe, Asia and the Middle East and has been applied at all voltage levels. The design philosophy emphasises reliability to enhance the security and dependability vital to the integrity and stability of power systems.