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Macromatic 120V AC Over/Undervoltage Monitor Relay, Fixed Time Delay

Macromatic VMP120A Over/Undervoltage Monitor Relay
Macromatic VMP120A 120V AC Over/Undervoltage Monitor Relay, Fixed Time Delay

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Price: $109.41
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MFG: Macromatic
Weight (lbs): 0.3

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Product Code: VMP120A


The Macromatic VMP120A is a voltage monitor relay. This 8 Pin plug-in relay has a nominal voltage of 120V AC. It checks for over or under voltage errors and has an output of 10A DPDT. The VMP120A operates with an adjustable pick-up voltage, a fixed drop-out time delay and a fixed drop-out voltage. The LED indicator on the VMP120A is red to show when the relay is energized or green when it is not. It uses an 8 Pin 70169-D octal socket and features true RMS voltage measurement for more precise sensing. Note: Image is an approximation. Actual part may differ.


  • Relay Function- Over/Undervoltage
  • Nominal Voltage- 120V AC
  • Output- 10A DPDT
  • Pick-up Voltage Range- 90-150V AC
  • Drop-out Voltage Range- 68-142V AC (95% of Pick-Up)
  • Setting Accuracy- Max Setting (Adjustable): +5%, -0%
    Min Setting (Adjustable): +0%, -50%
    Fixed Voltage Setting: +/- 2%
  • Repeatability- <1%
  • Load- <2VA
  • Sensing Accuracy- Constant conditions within specifications: +/-2%
    Variable conditions within specifications: +/- 5%
  • Operating Temperature- -28 C to 65 C (-18 F to 149 F)
  • Storage Temperature- -40 C to 85 C (-40 F to 185 F)
  • Voltage Tolerance- +/-50% of Nominal Voltage
  • Output Contacts- 10A @ 240V AC, 7A @ 30V DC, 1/4HP @ 120/240V AC, C300
  • Life- Mechanical: 10,000,000 Operations, Full Load: 100,000 Operations
  • Response Time- Pick-up: 0.5 sec, Drop-out: 0.5 sec
  • Reset- Automatic
  • Transient Protection- 2000V for IEC 61000-4-5 Level 3 (+/-2kV)
  • Dimensions- 2.4" Height x 1.7" Width x 3.5" Depth
  • Approvals- UL and CUL recognized, CE, UL & CUL listed (with Socket)

When the voltage stays above the preset pick-up voltage (90-150V AC) for a longer period than the pick-up time delay, then the unit is energized. If the voltage goes below the drop-out for a longer duration than the drop-out time delay, then it de-energizes. The drop-out time delay is fixed at 0.5 seconds. Whether the VMP120A monitors for undervoltage or overvoltage situations depends on the type of output contacts being used.

Overvoltage protection utilizes a normally closed contact. The voltage has to stay below the max setting for the load to be energized while the relay itself remains de-energized. If the voltage goes above this level, the load de-energizes and the relay energizes until voltage goes back down.

Undervoltage monitoring requires a normally open contact. The load stays on and the relay is energized so long as the voltage stays above the minimum setting. Voltage going below the minimum de-energizes both the load and the relay.

Macromatic VMP Series Relay Installation Instructions

Under/Over AC Voltage Monitor Relay VMP120A

Additional Product Information

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