VoltageVision® Through-door voltage indicator. Typically hardwired to the load side of the disconnect or circuit breaker, the VoltageVision® (R-3W) flashes whenever hazardous voltage is present in any individual phase. Redundant circuitry or long life LED. 40 to 750 VAC or 30 to 1000 VDC. Potted construction with 6 ft leads. Phase insensitive. 30 mm pushbutton or pilot hole. High surge immunity. UL type-4X listed.