Voltage Monitor Relays

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: Over/Under Voltage Relays--provides protection to equipment where either an over 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 over voltage relays, 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.
Refer to the tables below for more information, then click on a specific Series to see details about a specific product type. If you have any questions regarding the selection or application of voltage monitor relays

Over/Under Voltage Relays (12-120V)

Series	Pick-Up Voltage	Drop-Out Voltage	Time Delay Drop-Out	Function Chart
VMP	Adjustable 85-115% of Nominal	Fixed 95% of Pick-Up	Fixed 500ms
VMKP	Adjustable 85-115% of Nominal	Adjustable 75-95% of Pick-Up	Fixed 500ms
VAP	Adjustable 85-115% of Nominal	Fixed 95% of Pick-Up	Adjustable 0.5-10 seconds
VAKP	Adjustable 85-115% of Nominal	Adjustable 75-95% of Pick-Up	Adjustable 0.5-10 seconds

Voltage Band Relays (12-120V)

Series	Over Voltage Range	Under Voltage Range	Time Delay Drop-Out	Function Chart
VWP	Adjustable 100-125% of Nominal	Adjustable 75-100% of Nominal	Fixed 500ms
VWKP	Adjustable 100-125% of Nominal	Adjustable 75-100% of Nominal	Adjustable 0.5-10 seconds

Over/Under Voltage Relays (208-240V)

Series	Pick-Up Voltage	Drop-Out Voltage	Time Delay Pick-up & Drop-Out	Function Chart
VAKPU	Adjustable 85-115% of Nominal	Adjustable 80-95% of Pick-Up	Adjustable 0.1-10 seconds

Voltage Band Relays (208-240V)

Series	Over Voltage Range	Under Voltage Range	Time Delay Pick-up & Drop-Out	Function Chart
VWKPU	Adjustable 100-125% of Nominal	Adjustable 75-100% of Nominal	Adjustable 0.1-10 seconds