Frequency Relay   Application :   The Rishabh frequency Protectors give continuous surveillance of the monitored circuit. When the frequency moves outside the set point limit the relay will operate giving an alarm, control or tripping signal. An illuminated LED indicates when the relay is energised. Since with generators the speed is proportional to the frequency, this   protector can be used to protect for:   • Over speed   • Under speed   • Over Frequency   • Under Frequency   • Standby supplies for Industrial, Hospital or Marine use   • Mains supplies   • Computer supplies   • Other control gear       Features :   • Adjustable set point   • Adjustable differential   • LED trip indication   • 2 pole relay contacts         Specifications :   Nominal frequency 50, 60 or 400Hz System Voltage 100, 110,120, 230, 240, 400, 380, 415 or 440V ± 20% (57 to 480V) Overload 1.2 x continuously 1.5 x for 10 x 10 seconds To B.S. 6253 Burden 3VA Time Delay Preset (specify) maximum 30seconds Set Point : Repeatability Better than 0.5% Range 40/60Hz and 50/70Hz adjustable Differential 0.1 to 3.0Hz adjustable Range 360/440Hz adjustable Differential 10 to 30Hz adjustable Weight 252 case - approximately 0.4kg 253 case - approximately 0.6kg Output Relay : Type D.P. Changeover Rating A.C 240V,5A non-inductive   D.C View chart Operations 0.2 million at the above loads Reset Automatic         - Protector Trip Relays   - Motor Protection Relay   - Earth Fault Relay   - A.C. Current Relay   - A.C. Voltage Relay with adjustable differential   - A.C. Voltage Relay with adjustable time delay   - Frequency Relay   - Combined Under / Over Voltage & Under / Over Frequency Relay   - Phase Sequence & Phase Failure Relay   - Phase Balance Relay   - Reverse Power (Current) Relay   - Synchro-Check Relay(Paralleling)   - D.C. Voltage Relay   - Thermistor Trip Relay   - Hot Spot 3 Relay   - Hot Spot 6 Relay   - Millivolt / Thermocouple Relay   - Transducer Trip   - Speed Sensing Trip Relay