Voltage Monitor Relays from Macromatic

Voltage Monitor Relays monitor either AC single phase (50-60Hz) or DC voltages to protect equipment against voltage fault conditions. No separate supply (input) voltage is required on any Macromatic Voltage Monitor Relay. All versions are available in a compact plug-in case utilizing an 8 pin octal socket.

Macromatic offers two styles of Voltage Monitor Relays:

  • Overvoltage/Undervoltage Relays--provides protection to equipment where either an over voltage or under voltage condition is potentially damaging. When used as an under voltage relay, they provide protection to equipment that is required to operate above a minimum voltage. When used as an over voltage relay, they protect equipment against excessive voltage conditions. Over/Under Voltage Relays are designed to operate when the operating voltage reaches a preset value and drop-out when the operating voltage drops to a level below the preset value.
  • Voltage Band Relays--provides protection to equipment that is required to operate within an upper & lower voltage limit. As long as the operating voltage remains within an OVER & UNDER voltage range, the internal relay stays energized. If the operating voltage falls outside this range, the relay will drop-out.
 This is an example of any voltage monitor relay for 12-120V applications This is an example of any voltage monitor relay for 208-240V applications
12-120V 208-240V
Over/Under Voltage Relays (Click on Series to View Product Specifications)
Series Nominal Voltages Pick-Up Voltage Drop-Out Voltage Time Delay on Drop-Out
VMP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 85-115%
of Nominal		 Fixed 95% of Pick-Up Fixed 500ms
VMKP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 85-115%
of Nominal		 Adjustable 75-95%
of Pick-Up		 Fixed 500ms
VAP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 85-115%
of Nominal		 Fixed 95% of Pick-Up Adjustable 0.5-10 seconds
VAKP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 85-115%
of Nominal		 Adjustable 75-95%
of Pick-Up		 Adjustable 0.5-10 seconds
VAKPU 208-240VAC Adjustable 85-115%
of Nominal		 Adjustable 80-95%
of Pick-Up		 Adjustable 0.1-10 seconds

Voltage Band Relays (Click on Series to View Product Specifications)
Series Nominal Voltages Over Voltage Range Under Voltage Range Time Delay on Drop-Out
VWP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 100-125%
of Nominal		 Adjustable 75-100%
of Nominal		 Fixed 500ms
VWKP 12VDC, 24VAC, 24VDC, 48VDC,
110VDC & 120VAC		 Adjustable 100-125%
of Nominal		 Adjustable 75-100%
of Nominal		 Adjustable 0.5-10 seconds
VWKPU 208-240VAC Adjustable 100-125%
of Nominal		 Adjustable 75-100%
of Nominal		 Adjustable 0.1-10 seconds

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