The SEL-551C overcurrent/reclosing relay with mixed I/O connections and an optional front-panel communications port is said to enable easier system integration, plus simplified engineering access for monitoring, changing settings and downloading fault data. The need for flexible communications and convenient engineering access to settings and data is said to be addressed by the SEL-511C overcurrent/ reclosing relay, which combines complete overcurrent protection and multi-shot reclosing to protect lines and equipment using a sensitive and secure mix of phase, negative-sequence and ground overcurrent elements. The SEL-551C relay is said to enable easy integration into industrial protection and control schemes with the Modbus RTU protocol. A rear serial communications port is available as either an EIA-232 or an EIA-485 interface. Also new, an optional front-panel EIA-232 port is said to allow easy connection for engineering functions such as changing relay settings, downloading information, etc.
Schweitzer Engineering Circle 83 on card