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Voltage Monitor Relays
VM Series Over/Undervoltage
Fixed Time Delay on Drop-out
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Over/Under Voltage Relays provide protection to equipment where either an over or under voltage condition is potentially damaging. They 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. | |
The pick-up voltage setting is user-adjustable from 85-115% of the nominal voltage rating. As standard, the VMP Series has a drop-out voltage setting fixed at 95% of the pick-up voltage setting. An adjustable drop-out setting of 75-95% of the pick-up setting is available on the VMKP Series. The relay energizes when the monitored voltage is above the pick-up setting. The relay de-energizes when the monitored voltage is below the drop-out setting for a period longer than the drop-out time delay (T), which is a fixed 500ms for VM Series products. An adjustable time delay on drop-out of 0.5-10 seconds is available (see VA Series). |
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Adjustable Pick-Up, Fixed Drop-Out Settings *
Time Delay on Drop-out Fixed at 500ms
| NOMINAL VOLTAGE | VOLTAGE l PICK-UP | VOLTAGE RANGE DROP-OUT | VOLTAGE RANGE PRODUCT | NUMBER WIRING/SOCKET | ||
| 24VAC 120VAC |
21-27VAC 102-138VAC |
20-26V AC 97-131V AC |
VMP024A VMP120A |
8 Pin Octal 70169-D  DIAGRAM 20 |
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| 12VDC 24VDC 48VDC 110VDC |
10-14VDC 21-27VDC 41-55VDC 94-126VDC |
9-13V DC 20-26V DC 39-52V DC 89-121V DC |
VMP012D VMP024D VMP048D VMP110D |
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| Drop-Out Voltage is fixed at 95% of the Pick-Up Setting. Click here for Sockets & Accessories. | ||||||
Adjustable Pick-Up & Drop-Out Settings **
Time Delay on Drop-out Fixed at 500ms
| NOMINAL VOLTAGE | VOLTAGE l PICK-UP | VOLTAGE RANGE DROP-OUT | VOLTAGE RANGE PRODUCT | NUMBER WIRING/SOCKET | ||
| 24VAC 120VAC |
21-27VAC 102-138VAC |
16-26V AC 77-131V AC |
VMKP024A VMKP120A |
8 Pin Octal 70169-D DIAGRAM 20 |
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| 12VDC 24VDC 48VDC 110VDC |
10-14VDC 21-27VDC 41-55VDC 94-126VDC |
8-13V DC 16-26V DC 32-52V DC 71-121V DC |
VMKP012D VMKP024D VMKP048D VMKP110D |
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| ** Drop-Out Voltage is adjustable from 75-95% of the Pick-Up Setting. Click here for Sockets & Accessories. | ||||||
Operating ModesVoltage Monitoring Relays can be used as either overvoltage or undervoltage relays, depending on the output contact used: | |
| Overvoltage Relay
Provides protection to equipment that cannot handle excess voltages. Uses a normally closed contact (N.C.). As long as the monitored voltage remains below the maximum voltage the equipment can withstand (Pick-Up Setting), the relay remains de-energized and the N.C. contact remains closed, keeping the load energized. If the operating voltage increases beyond the maximum rating of the equipment, the relay energizes and the N.C. contact opens, turning off the load. When the voltage falls below the Drop-Out Setting (hysteresis), the relay de-energizes and the N.C. contact re-closes, turning on the load. |
Undervoltage Relay
Provides protection to equipment that is required to operate above a certain minimum voltage. Uses a normally open contact (N.O.). As long as the monitored voltage is above the minimum value required (Pick-Up Setting), the relay will energize and the N.O. contact closes, turning on the load. If the voltage drops below the Drop-out Setting (the minimum voltage required minus the hysteresis), the relay will de-energize and the N.O. contact will re-open, turning off the load. |
Application DataVoltage Monitoring Relays can be used as either overvoltage or undervoltage relays, depending on the output contact used: | |
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Voltage Tolerance +25%/-50% of nominal voltage; AC voltages are 50-60Hz; No supply (input) voltage is required. Load (Burden): 3VA. Voltage Settings Pick-up: Adjustable from 85-115% of nominal voltage Drop-out: Fixed at 95% of the pick-up setting (VMP Series) Adjustable from 75-95% of pick-up setting (VMKP Series) Temperature: -28o to 65oC (-20o to 150oF) Output Contacts: 10A Resistive @ 240VAC/30VDC, 1/2HP @ 240VAC (N.O.), 1/3HP @ 240VAC (N.C.) Life: Mechanical: 10,000,000 operations Full Load: 100,000 operations |
Response Times: Operate: 500ms Release: Fixed 500 ms Indicator LED: Red when Relay is energized and Green when Relay is Off. Transient Protection: 10,000 volts for 20 microseconds Reset: Automatic Approvals:  
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Dimensions
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