Macromatic voltage monitor relays check AC single phase or DC voltages for over or under voltage problems. These are used in applications in which a voltage issue can cause problems for the equipment. They are available with plug-in style or DIN-rail mount housings with the settings on most units being adjustable. Besides over/under voltage relays, voltage band relays are also available that check to see if a voltage is staying within certain limits. All of them feature LEDs to show the current output status of the relay, along with fixed or adjustable drop-out time delays. Outputs are 10A SPDT or 10A DPDT.