The Low Voltage Reset indicator consists of two parts - the sensor (transmitter) and the display (receiver). The sensor is designed to minimize proximity effect described as the sensitivity of FCIs to fault currents on other phases of a three-phase system. The patented FISHEYE™ display provides 180° visual indication of FCI operation. This unique orange reflective target designates a fault and a black target designates a normal condition. The sensor is attached to the primary cable and the display is mounted in the cabinet wall so that it is visible from the outside at a glance. The polycarbonate display housing is made of a Lexan® material providing the exposed target window tamper- proof and scratch-resistant protection. A six foot fiber optic cable connects the sensor to the display, thereby eliminating any electrical or metallic connection between the primary side and the secondary side of the transformer. A six foot low voltage cable from the display attaches to the secondary bushings.

An inrush restraint feature eliminates false tripping and is standard on all units. The S.T.A.R. faulted circuit indicator will ignore inrush currents caused by reclosing operations of protective devices on the system. A dead time of 200 ms will activate the inrush restraint feature. A low pass filter, also a standard feature, will prevent the S.T.A.R. faulted circuit indicator from tripping on high frequency transients like those caused by cable capacitive discharges.

Another standard feature is the reset restraint circuit. It prevents the premature resetting of faulted circuit indicators caused by feedback voltages of less than 90 VAC (Standard LVR Type; reset restraint for LVR with Universal Power Supply options is 60% of nominal secondary voltage). In addition, the S.T.A.R. faulted circuit indicator is equipped with temperature compensation circuitry to assure accurate, reliable performance over the entire specified temperature range. The quick response time of the Low Voltage Reset S.T.A.R. faulted circuit indicator allows easy coordination with current-limiting fuses. The unit is insensitive to primary line voltage and will operate on any cable system. This unique combination of standard features makes the S.T.A.R.faulted circuit indicator extremely reliable.