Rish Relay 252-PVx - AC Voltage Relay with Adjustable Time delay
The AC voltage protector provides continuous surveillance of the monitored circuit. When the measured voltage moves outside the set point limit, the relay will operate after the selected time delay, giving an alarm and/or initiation signal.
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- Adjustable setpoint
- Adjustable Time Delay
- Internal differential ( factory Settable )
- LED trip indication
- 2 pole relay contacts
- Energize/De-energize function swapping
- Auto Reset
Product Function
Overvoltage models: When the monitored voltage exceeds the setpoint, the time delay is started. When the time has elapsed, the relay will energize, and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored voltage falls below the setpoint minus the differential. When reset, the LED will extinguish, and the relay de-energizes. The time delay is not active when resetting.
Under Voltage Models: When the monitored voltage falls below the setpoint, the time delay is started. When the time has elapsed, the relay will de-energies, and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored voltage rises above the setpoint plus the differential. When reset, the LED will illuminate and the relay energizes. The time delay is not active when resetting. On request, any product can be manufactured with the energize/de-energize function swapped.
Applications
The protector can be used to protect for:
Under voltage
Overvoltage
Start up standby generators
Operation of mains failure units
Switching standby hybrid supplies
Protecting computer supplies
Where close control is required.
Gensets - To monitor the correct operation of the AVR (automatic voltage regulator) and excitation system.
Motors - Some electric motors are voltage-sensitive and can overheat and burn out when operated at low voltage
UPS supplies - When the main A.C. supply falls outside the acceptable operating voltage window, the relay can initiate a changeover to an alternate or standby supply
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