FAQ's for Phase Monitor Relays

• What is the maximum voltage that your phase monitors can handle? What about the units that offer overvoltage protection?
  
  
• What size fuse do you recommend using with your Phase Monitor Relays?
  
  
• What 8 pin socket do I use for any of your plug-in Phase Monitor Relays on applications greater than 300V? According to the specifications I have seen in many catalogs, 8 pin sockets are normally only rated 300V and my system voltage is 480V.
  
  
• I have purchased one of your three phase monitor relays and have connected it per the diagram on the unit. However, I cannot get the unit to operate--it just won't turn on. What's wrong?
  
  
• Both your PMDU & PMPU three-phase monitors can work on any voltage between 208 & 480V. They also include an adjustable undervoltage trip setting of 75-95% and a fixed overvoltage trip setting of 110%. How do these percentages work depending on where you set the nominal voltage?
  
  
• Do your Phase Monitor Relays work at both 60hz as well as 50hz? What is the tolerance at either value?
  
  
• I have never connected a three-phase monitor relay. Do you have a typical wiring connection?
  
  
• What is the advantage of using the PMPU-FA8X phase monitor relay?
  
  
• What is the Short Circuit Current Rating (SCCR) of Macromatic Three-Phase Monitor Relays?
  
  
• Will Macromatic products work at 50 Hertz, as required in other parts of the world?
  
  
• I have a Macromatic product that has stopped working. It was working one day and then stopped functioning the next. What's wrong?
  
  
• What is the difference between "UL Listed" & "UL Component Recognized"?
  
  
• Why aren't your Time Delay Relays or Alternating Relays Div 1 Class II?