Rish Relay 253-PVx - AC Voltage Relay with Adjustable Differential
The AC Voltage Protectors provide continuous surveillance of the monitored circuit. When the measured voltage moves outside the set point limit, the relay will operate, giving an alarm and or initiation signal.
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- Adjustable setpoint
- Adjustable differential
- Internal differential ( factory Settable )
- LED trip indication
- 2 pole relay contacts
- Energize/De-energize function swapping
- Auto Reset
Product Function -
Standard overvoltage relays will energize on a trip when the nominal input voltage plus the user-adjustable ‘over nominal value’ is exceeded; the relay will automatically reset to de-energize when the input voltage is lowered past the setpoint minus the hysteresis value.
Standard under-voltage relays will de-energize on a trip when the input voltage is below the nominal value minus the user-adjustable ‘under the nominal value. The relay will automatically reset to energize when the input voltage is raised past the setpoint plus the hysteresis value.
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
Over voltage
Start up standby generators
Operation of mains failure units
Switching standby hybrid supplies
Protecting computer supplies
Close control of equipment
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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