Over/Under Voltage Relays provide protection to
equipment where 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 VAP 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 VAKP 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 adjustable from
0.5-10 seconds for VA Series products. |
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| OPERATING
MODES: |
| These relays can be used as
either overvoltage or undervoltage relays, depending on the output contact
used. |
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| 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 deenergized 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. |
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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. |
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Features:
- Monitors AC single phase and DC voltages
- Wide range of user-adjustable pick-up and drop-out
settings
- Adjustable time delay on dropout of 0.5 - 10 seconds
- LED indicates output relay status
- Compact plug-in case utilizing industry standard 8 pin
octal socket
- 10A DPDT output contacts
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Click here for specifications and dimensions in .pdf
format  |
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| Adjustable Pick-Up, Fixed
Drop-Out Settings Adjustable Time Delay on Drop-out from 0.5 - 10 Seconds |
| *Drop-out Voltage is fixed at 95% of the
adjusted Pick-up Setting. |
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| Adjustable Pick-Up &
Drop-Out Settings Adjustable Time Delay on Drop-out from 0.5 - 10 Seconds |
| Voltage Tolerance: |
+25%/-50% of nominal voltage; AC voltages are 50-60Hz; No
separate supply (input) voltage is required. |
| Load (Burden): |
Less than 3VA |
| Voltage Settings: |
Pick-up: Adjustable from 85-115% of nominal voltage
Drop-out: Fixed at 95% of pick-up setting (VAP) Adjustable from 75-95% of
pick-up setting (VAKP) |
| Temperature: |
-28° to 55°C (-18° to 131°F) |
| Output Contacts: |
10A @ 240V AC/30V DC, 1/2HP @ 120/240V AC (N.O.), 1/3HP @
120/240V AC (N.C.) |
| Life: |
Mechanical: 10,000,000 operations
Full Load: 100,000
operations |
| Response Times: |
Operate: 500ms
Release: Adjustable 0.5 - 10 Seconds (VAK
& VAKP Series) |
| Indicator LED: |
Red Steady when Relay is energized; Green when Relay is
Off. |
| Transient Protection: |
10,000 volts for 20 microseconds |
| Reset: |
Automatic |
