D.C. Voltage Relay   Application :   The Rishabh D.C. Voltage protectors provide continuous surveillance of the monitored circuit. When the measured voltage moves outside the set-point limits, the relay will operate after the selected time delay or differential, giving an alarm and/or initiation signal.   The Protector can be used to protect for:   • Under voltage   • Over voltage   • Battery level control.   An illuminated LED indicates when the relay is energised. Relays normally energise on over voltage and de-energise on under voltage.       Features :   • Adjustable set point   • Adjustable time delay   • Internal differential   • LED trip indication   • 2 pole relay contacts         Specifications :   Model : Under Voltage 252-PDU Over Voltage 252-PDO Input : D.C. Voltage 18 to 20 V d.c. or 20 to 32 V d.c. Time Delay Externally adjustable Specify either : 0-10, 0-20, 0-30 seconds Differential Preset to 1 % (Any value between 1 and 15%) Model : Under Voltage 252-PDE Input 2 D.C. Voltage 18 to 20 V d.c. or 20 to 32 V d.c. Time Delay Optional preset up to 30 seconds (specify) Differential Externally adjustable Range 1-15 % All Models 2 Burden < 3 VA Overload 12 x continuously Weight Approximately 0.4Kg Set point   Repeatability Better than 0.5% 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   - 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