Intrinsically Safe Barrier Relay. Each ISE Series relay consists of an intrinsically safe input and a corresponding electromechanical relay output. There is one bi-color LED for status indication. With input voltage applied, the LED will be ON (Green) to indicate power is applied. When the input device from the hazardous area is closed, the output relay is energized and the LED is ON (Orange). When the input device opens, the output relay will de-energize and the LED will be ON (Green). 1-Channel. 5A relay output. Universal input voltage of 102-132V AC and 10-125V DC. LED status indicator. UL913 8th Edition.