Apollo XP95 DIN-Rail Dual Isolator (55000-802APO)

The Apollo DIN-Rail Dual Isolator provides two independent isolators which sense and isolate short circuits on Discovery and XP95 loops and spurs.

Operation

Under normal operating conditions, a low impedance is present between the two negative terminals of each isolator channel so that power and signals are passed to the next base in line.

If a short-circuit or abnormally low impedance occurs across the loop, the fall in voltage is sensed and the isolator isolates the negative supply in the direction of the fault. In this condition, the yellow LED of the affected channel will be illuminated. the isolated section of loop is tested using a current pulse every five seconds. When the short-circuit is removed, the power will automatically be restored.

The two isolator channels are not interconnected internally, and operate completely independently of one another.

Mechanical Construction

The DIN-Rail Isolator is supplied in a standard housing which is clipped onto a standard 35mm DIN Rail (DIN46277) or fixed directly to the enclosure using two 4mm screws.

Connections are made via plug/in terminal blocks which accept wires up to 2.5mm2.

Two yellow LEDs - one per channel - are visible through the top cover of the enclosure. When a channel is in an isolating condition, the associated LED is illuminated continuously.