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Short-circuit isolator: on a loop fault it cuts off only the damaged section.
BRIZ protects the addressable loop from total failure: on a short circuit the module isolates exactly that segment while the rest of the loop with its detectors keeps working. Without isolators a single short can take the whole line down. The module is inserted into the two-wire Orion loop, powered from it and needs no configuration. A required element in projects with many detectors on one loop where losing the line is unacceptable.