The QE analog voltage monitors specifications include: low-cost motor protection, built-in anti-short cycle protection, detects high/low voltage conditions, helps prevent rapid short cycling, LED indicators: green for normal conditions / red for faults, and heavy-duty SPDT, isolated relay output. Also feature: front/back system monitoring, knob-adjustable features, and system points, incorrect sequencing, & rapid short cycling. Individually packaged. Protector for refrigerators and air conditioners up to 18 kBtu, as well as single-phase compressors and motors. • Minimal and maximal voltage and adjustable time delay • Designed under international quality certifications. • Work: 110V, 50/60Hz, Current 20A. • Time delay: 1.5 to 5 min. • Under and Over Voltage: 125V to 145V / 90V to 115V Adjustable.