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. A version with an adjustable time delay on drop-out of 0.5-10 seconds is available (see VA Series).
| Macromatic Industrial Controls, Inc. | Quarktwin Technology Ltd. | |
|---|---|---|
| Product Category | Protective Relays and Monitoring Relays | Protective Relays and Monitoring Relays |
| Product Number | VMP240A | VMP240A |
| Product Name | Voltage Monitor Relays - VMP Series | Protection Relays & Systems |
| Voltage Sensitive Relay | Overvoltage Protection; Undervoltage | |
| Protective Functions | Time Delay | |
| Features | Automatic Reset; Sealed Relay; Visual Indicator |
