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The Context Plus XP95 20D isolating base senses and isolates short circuit faults on loops and spurs. The base is loop powered, polarity sensitive and accepts the XPERT card to set the associated device address.
In short circuit conditions, the integral yellow LED is illuminated. The detector associated with the base remains active under short circuit conditions. Power and signals to the affected section are restored automatically when the fault is cleared.
Under normal operating conditions, a low impedance is present between the ? IN and ? OUT terminals of the base, so that power and signals pass to the next base in the line.
If a short circuit or abnormally low impedance occurs, the fall in voltage is sensed and the base isolates the negative supply in the direction of the fault.