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Motor Protection Relay

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Taking quality as our prime importance, we are engaged in manufacturing, supplying, exporting and trading Motor Protection Relay. Ideal for motor protection, these relays are manufactured using reliable hardware with special algorithms, which allows to calculate the tripping time. Continuously monitors the three phase currents to build the thermal replica, which is used to protect the motor against thermal overloads, these relays are appreciated for accurate measurements and thermal memory.
Features:



  • Accurate measurements
  • Thermal memory
  • Dimensional accuracy

Other Details:



  • Selectable Thermal Trip Time characteristics Class - 10A, 10, 20 and 30
  • Pre-alarm at 105 % of Im by Potential Free Output Contacts
  • Fault records up to Previous 999 faults and 20 Previous On-Board faults with Date and Time stampings
  • Increment/Decrement Key and Mode/Set key in front facia
  • Operational and Type / Nature of Fault indications through OLED
  • Communication through Modbus protocol with RS-485 Port
  • Enable/Disable option for Earth Fault, Under Current, Locked Rotor, Phase Unbalance Protection
  • Various Models with Current ratings
  • Dimensions in mm: 70X75X109 (WXHXL)
  • Operating Temp: 0c to +60c
  • Auxiliary Power Supply: 85-275V AC/DC
  • Trip Accuracy: As per IEC 947-4-1Trip Class 10A, 10, 20, and 30
  • Pick-Up Accuracy: +/- 12.5%

Specifications:


Thermal Over Load Protection:



  • Over Load Current Setting Range 2.0Amps – 96.0Amps in 4 ranges as explained in SL.13
  • Trip Time Characteristics Class 10A, 10, 20 &30 as per IEC 947-4-1
  • Pre-alarm at 105 % of Im by One set of Potential Free output Contacts
  • Thermal Memory Provision

Earth Fault Protection:



  • Earth Fault Current Setting Range10% to 50% of Im, in steps of 1% (20% - Factory Set)
  • Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (0.1Sec - Factory Set)
  • Enable/Disable Option

Phase Unbalance:



  • Unbalance Current Setting Range 10% to 50% of Im, in steps of 1% (40% - Factory Set)
  • Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (2.0Sec - Factory Set)
  • Enable/Disable Option

Locked Rotor Protection:



  • Locked Rotor Current Range Greater than 3 times of Im (LR Setting can be tailored to customer specific)
  • Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (1.0Sec - Factory Set)
  • Enable/Disable Option

Under Current Protection:



  • Under Current Setting Range 10% to 50% of Im, in steps of 1% (50% - Factory Set)
  • Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (3.0Sec - Factory Set)
  • Enable/Disable Option

Loss of Phase/Single Phasing:



  • Applicable when Im Greater than 35%
  • Trip Time Delay Fixed (0.5Sec - Factory Set)

Phase Reversal Monitoring:



  • Trip Time Delay Fixed (0.5Sec - Factory Set)

Contacts:



  • 1NO/NC 250V@5A AC, 24V@5A DC Potential-Free Output Contacts for Overload Pre Alarming Circuit
  • 2NO/NC 250V@8A AC, 30V@8A DC Potential-Free Output Contacts for Tripping Circuit for all seven Faults

Prok dv’s PD-MMPR-303 Series is available in TWO Versions as:



  • Fail safe
  • Non-Fail safe (Non-Fail safe – Factory Set)

Applications:

  • Protection of LV Motors up-to 75 HP in Motor Control Centres

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