.:: Voltage Protection Relays ::..(3x380V AC)

Application and Operation Principles

GR-XXX : Main problems for Industrial type electric motors are phase-phase voltage unbalance/fluctuations and overload occurrences.GR-XXX is developed to protect the motors against such inconvenient occurrences. GR-XXX is secured against instantaneous voltage peaks causing faulty tripping. GR-XXX is normally is switched on and the LED is turned on when R-S-T phase voltages are having nominal values. when the phase-phase voltage fall under Umin or rise above Umax the LED the turns on and the delay time counting starts. If, during the delay time period, the phase-phase voltage reaches at the pre-set value the relay is switched on and the LED is turned on. In case of family tripping continues then the relay is reached. Motor remains out of operation. When the voltage have the normal level, motor starts to run again.

GR-ADF : GR-ADF in addition with phase sequence is designed to protect three phase systems in where the inverse phase is critically important. When R-S-T phases are sequenced correctly the relay switches off and the LED turns on. Wrong or inversed sequenced may cause the relay be switched of and the LED be turned off. In this case, interchanging two phases will enable the relay be switched on and the LED be turned on. Thus motor will start running.

PTC : PTC is used to prevent motors internal overheating. When the motor winding(coil) temperature exceeds PTC the output relay switches off in a way to protect against motor burning.

MKR-09 : Frequent under-voltage may cause serious damages on the devices. MKR-09 controls phase-neutral voltage difference of three phase. MKR-09 is an ideal relay for air conditianing systems, climatization system, e,g. when any or all of the phase voltage valves drop below the set interval (standard 150V). the voltage indication LED and the relay is switched on to cut off the energy. When the voltage reaches at the adjusted limits the voltages indication LED switches on and The relay is kept inactive until the set delay time period is on. At the end of the set delay time the relay switches off and relay operating LED turns on. Thus the device connected with relay start operation. If, during the set time counting period, the voltage value drops below the set interval limits, the timer will reset zero. Once the voltage is normal then the time counting starts from zero.

Technical datas for GR-XX

• Supply Voltage : 3x380 V AC 50-60Hz
• Contact Output : 250 V AC - 5 A
• Under Voltage Level : 270 - 370 V AC (Adjustable)
• Over Voltage Level : 390 - 440 V AC (Adjustable)
• Relay On and Off Delay : 0 - 12 sn. (Adjustable)
• Hysteresis : max. 15V
• Setting Error : +5%
• Operation Temperature : -40C ... +55C
• Net Weight : 280gr

Technical datas for Slim Type (MKR-09)

• Supply Voltage : 3X380 VAC 50 - 60Hz
• Under Voltage : 150 + 5V
• Time Interval : 5 min. - 18 min.
• Contact Output : 250V-5A
• Hysteresis : max. 5V
• Operation Temperature : -40C ... +55C
• Net Weight : 75 gr