SSK
DESIGN ENGG
Under and Over Voltage Protection Relay
PLOT NO: 4158, FIRST FLOOR, T.N.H.B, AYAPAKKAM, CHENNAI - 600077, TAMILNADU, INDIA. CONTACT PH.NO: 9840292883; CLICK CONTACT TAB FOR MORE
Ø Over and Under Voltage % Adjustment
Ø Delay Time Adjustment
Microprocessor controlled. Three or single phase relay is used in systems exposed to over
or under voltage, such as command, control or compensation systems and protectsdevices
such as condensers, motors, air conditioners and compressors. It is divided into sub-
categories depending on the voltage adjustment range, on or off start modes.
3. Function Features:
When three- phase voltage is normal, the 'Out' LED flash seconds. After the fault recovery
time, setting by potentiometer 'Ton', 'Out' LED turns on, and relay is closed.
When any line voltage is overvoltage, overvoltage failure indicator ' › Un' LED flash seconds
Reaching the fault delay time which setting by 'Toff ', relay disconnect; 'Out' LED turn off
and overvoltage failure indicator ' › Un' LED is turn on. If power recover to normal before the
fault delay time, then relay and 'Out' LED are not act, still closed; When voltage value is
1.3 times higher, without delay, relay immediately disconnect, overvoltage failure 'Un' LED
turns on.
When any line voltage is undervoltage, undervoltage failure indicator ' › Un' LED flash
seconds Reaching the fault delay time which setting by 'Toff ', relay disconnect; 'Out' LED
turn off andundervoltage failure indicator ' › Un' LED is turn on. If power recover to normal
before the fault delay time, then relay and 'Out' LED are not act, still closed; When
undervoltage value is 0.7 times lower, without delay, relay immediately disconnect,
undervoltage failure 'Un' LED turns on.
When the voltage recover from the fault status to normal, the 'Out' LED flash seconds, fault
recover time which is setting by 'Ton' has reached, then the relay close and output, 'Out'
LED turns on; If the overvoltage and undervoltage happen before the reaching of fault
recovery time, 'Out' LED are not act, still disconnected; over voltage and under voltage
indicator light on.
