• JVS Electronics Private Limited

DC Voltage Relays

JVS Electronics offers DC Voltage Relays, JRV 202. Features: software based design; wide setting range; negligible burden; trip indication with LED; trip test facility; dust proof enclosure; and compact size. Description: the power required by the electronic circuitry is drawn from the auxiliary AC supply. The sensing DC voltage is stepped down by a resistor network. This low level voltage fed to a voltage comparator. When this signal exceeds a preset level, the comparator output changes state and operates a relay through the relay driving circuitry, the positive feedback from the output to the reference of the comparator ensures sufficient hysteresis to provide a high drop-off/pick-up ratio. When definite time feature is selected, the time delay is achieved by R-C network and the operating time corresponds to the setting on the DIP switch. A "Trip Test" push button is also provided in the relay to enable testing of the trip and alarm circuits. This push button is accessible only after the front polycarbonate cover is removed. This ensures that unauthorised testing of the trip and alarm circuits is prevented. When this push button is pressed, the output element of the relay is energised and its contacts close to energise trip and alarm circuits. These relays are available in the following configurations: JRV 202 - instantaneous/definite time DC under voltage relay and JRV 212 - instantaneous/definite time DC over voltage relay. Applications are in: instantaneous/definite time under voltage/over voltage protection DC systems; and other instantaneous/definite time, under voltage/over voltage applications requiring adjustable settings.