Series 1548 Overhead Faulted Circuit Indicators. (Model F) Standard Offering, reclose dead time of 150 msec. (loss of current greater than 150 msec.), 3 Amp minimum load current required for reset. (Factory Code H). (Trip/Inrush Logic Option B) Adaptive Trip requires 60 second continuous minimum load current, arming time less than 1/4 cycle fault current, loss of current within 60 second of fault current, with 24 ms plus/minus 20 percent delay trip - backfeed restraint. (Trip/Current Option D) 300 Amp di/dt adaptive trip, Note 3 Amp minimum load required. (Reset Time-Delay Option C) 4 hour automatic with current reset override 60 seconds after restoration of power. (Factory Code 3). (Indicator Option R) Radio with single LED for applications up to 69kV. (Transmitter Phase Encoder Option C) Phase C. (Factory Code A).