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

Application and Operation Principles

PTC-01 : PTC - 01 is used for the protestion of motor winding(coil) against overheating. When the coil temperature of motor exceeds PTC, the limit temperature of PTC, the output relay switches of promptly. When the coil temperature reaches at the limit temperature intervals the relay switches on and the LED turns on. Thus, motor starts operating.

MKR-01 : Main problems for industrial type electric motors are the phase-phase voltage fluctuations and extreme overload occurances. MKR-01 is produced to remove off such inconveniences. If the phase voltage (R-S-T) are within the set interval the relay is switched on and the LED turns on. When the phase-phase voltage difference exceeds %15 of the supply voltage the relay is switched off, the LED turns off and the motor stops. In case of the phase-phase voltage difference falls below %15 of the supply voltage the relay is switched on and the LED is on.
With PTC : The relay switches on when the motor winding temperature (Coil) exceeds PTC temperature limit the output relay switches off promtly and the LED turns off. When coil temperature reach at the normal temperature limit the relay switches on, the LED is on and the motor starts.

MKR-02 : Under voltage variations on any motor winding out of three phase motors cause unbalanced load. In this circumstances motor may get a costly damage. MKR-02 is specially designed to protect motors being used in no neutral systems. (example; marine vessels).
The Relay Switches on and then motor starts when R-S-T phase voltages are at their normal values. The Relay Switches off and motor stops when one of the phase voltage drops under the set voltage limit or in case of phase interruption occurs. The Relay will switch on and then motor will restart when phases reach at the preset normal voltage valves.

MKR- 04 : It is desing to protect motor windings and to prevent burning in case of excess phase floatations and interruptions are occured. Motor switching off voltage is adjustable via a built on asymmetry adjustable button. Motor overhenting protection is always secured and insured. Relay motor starts via a contactor being connected into relay contacts. Relay is switched on when RST voltages are at their normal values.Motor starts via a contactor being connected into relay contacts. Relay switches off and then motor stops when phase voltage values are above the limits of the set voltage values. Relay switches on and motor restarts when phase voltage reach at normal values. Relay with OTC switches off the motor when motor internal temperature exceeds the set temperature degree (according to PTC). Relay will switch on the motor when motor internal heat reaches at normal temperature degree.
NOTE : PTC ends shall be short-circuited if PTC not used.

MKR-05 : Main problems for industrial type electric motors are the phase to phase voltage fluctuations and extreme overload occurrences MKR-05 is designed in principle to eliminate such inconveniences.
Asymmetry : It performs according to the phase-phase voltage balance. Asymmetry ratio is adjustable upon the choice. The phase-phase voltage difference can be adjustable in between %5 and %25 of the nominal voltage. When the phase- phase voltage difference is within the set intervals the LED is turned on and the relay is switched on. When the phase-phase voltage difference exceed the set valve the LED turns off and the relay switches off. The relay will be switched on once the voltage difference is reached to the set value.
Hysteresis : It is used to adjust input - output voltage difference in between %1 and %10 of the output voltage.
PTC : Overload causes overheating on the motor coil. This may be resulted with the destruction of the motor insulation. Consequently the motor will be under the risk of the burning. PTC is used to protect motors against overheating.

Technical datas for PTC-01(Termistor Relay)

• Supply Voltage : 220-240V AC 50-60Hz
• Contact Output : 250 V AC - 5A
• PTC Cut-off Resistance : 1600 -2000 ohm.
• PTC Reversing Resistance : 1000 - 1400 ohm
• Operation Temperature : -40C ... +55C
• Net Weight : 284 gr

Technical datas for MKR-01

• Supply Voltage : 3X380 VAC 50-60 Hz
• Relay Output : 250VAC-5A
• Unbalance Protection : +15%
• Under Voltage : 170V+10V
• Over Voltage : 270V+10V
• Hysteresis : max. 15V
• PTC Cut-off Resistance : 1600-2000 ohm.
• PTC Reversing Resistance : 1000-1400 ohm
• Operation Temperature : -40C ... +55C
• Net Weight : 140 gr

Technical datas for MKR-02

• Supply Voltage : 3X380 V AC 50-60Hz
• Contact Output : 250VAC-5A
• Unbalance Protection :+15%
• Under Voltage : 285V+30V
• Hysteresis : max. 15V
• Operation Temperature : -40C ... +55C
• Net Weight : 250 gr

Technical datas for MKR-04

• Supply Voltage : 3X380V AC 50-60 Hz
• Contact Output : 250VAC-5A
• Asymmetry Setting : +5% - +20% ( Phase to Phase)
• Hysteresis : max. 10V
• Setting Error : +3%
• PTC Cut-off Resistance : 1600 -2000 ohm.
• PTC Reversing Resistance : 1000 - 1400 ohm
• Operation Temperature : -40C ... +55C
• Net Weight :275 gr

Technical datas for MKR-05

• Supply Voltage : 3X380VAC 50-60 Hz
• Relay Output : 250VAC-5A
• Adjusting Range : +5% - +20%( Phase to Phase)
• Hysteresis : max. 10V
• Delay Time : 1 - 10 sec. (Adjustable)
• Setting Error : +3%
• PTC Cut-off Resistance : 1600 -2000 ohm.
• PTC Reversing Resistance : 1000 - 1400 ohm
• Operation Temperature : -40C ... +55C
• Net Weight : 275 gr

                                               .:: Ordering Information :::::..