Crouzet's HDU & HDI Series Monitoring Relays offer users extremely simple implementation thanks to front panel LCD displays. The modular format means they can be used in an industrial cabinet or in a subscriber board.

These new voltage monitoring relays (HDU) and current monitoring relays (HDI) give a permanent indication of the value and type of monitored signal, the state of the output relay and the function being carried out. When the user sets one of the parameters (threshold, hysteresis, time lag) using a potentiometer on the front panel, the display instantly switches to the measurement to the set value. This means that there is no longer any need for a multimeter. In addition, these relays automatically detect the alternating or direct form of the signal to be monitored.