The 7SR11  are overcurrent protection relays developed to enhance the Argus family of products by providing a familiar product using the latest generation of hardware technology. The 7SR11 overcurrent and earth fault relays and the 7SR12 directional relays are available in single and four pole variants. Housed in a 4U high, size E4 case, these relays provide protection, monitoring, instrumentation and metering with integrated input and output logic, data logging & fault reports. Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical RS485 port for remote connection.

Function Overview :

37 Undercurrent 46BC Broken Conductor / Load Unbalance 46NPS Negative Phase Sequence Overcurrent 49 Thermal Overload 50 Instantaneous Overcurrent 50G/N/SEF Instantaneous Earth Fault 50BF Circuit Breaker Fail 51 Time Delayed Overcurrent 51G/N/SEF Time Delayed Measured/Derived/Sensitive Earth Fault 64H High Impedance REF 27/59 Under/Over Voltage 47 Negative Phase Sequence Voltage 51V Voltage Controlled Overcurrent 59N Neutral Voltage Displacement 67/50 Directional Instantaneous Overcurrent 67/50G/N Directional Instantaneous Earth Fault 67/51 Directional Time Delayed Overcurrent 67/51G/N Directional Time Delayed Earth Fault 81HBL2 Inrush Detector 81 Under/Over Frequency Line Check/Switch onto Fault