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AC MONITOR PROTECTION RELAYS

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Single Phase

KEW-AC Protection Relays

Features of KEW-AVM-IP:

  • Display: 3-row, 4-digit bright LED display
  • Monitored Parameters: Voltage (RY, YB, BR), Current, kW, Power Factor, kWh, kVARh,
    Hours, Run Hours, Rotor Earth Fault
  • Protection Features: Under/Over Voltage, Over/Under Current, Earth Fault, Phase Reversal,
    Current Imbalance, Dry Run, Phase Loss
  • Programmability: CT/PT Ratio Programmable, Settable Trip Values, 2 Relay Outputs (user-configurable), MODBUS RTU support (optional)
  • Size: 96×96
Datasheet

Specification of AC Monitor Protection Relay

  • Measured
    Parameters:     RMS Voltage (20–600V), RMS Current (0.020–10.00A), Active
    Power (0.030–6.000kW), Apparent Power (0.030–6.000kVA),
    Reactive Power (0.030–6.000kVAR), Power Factor (0.3–1.0,
    Lag/Lead), Line Frequency (45–65Hz), Active Energy (0–
    999999.99kWh), Apparent Energy (0–999999.99kVAh),
    Reactive Energy (0–999999.99kVARh)
  • Relay Contact :
    2NOS-8 AMPS, 250VAC POTENTIAL FREE
  • Auxiliary Supply: 150–300V AC, 45–270V AC/DC, 19–60V AC/DC
  • VA Burden:
    Auxiliary Supply: <2.5 VA
    Voltage Input: <0.2 VA/Phase
    Current Input: <0.2VA/Phase
  • Impulse Withstand: 3.5KV for 1.2/50 micro second
  • CT Range: CT Primary: 1A–50kA (AC Programmable),
    CT Secondary: 0.5A–5A (AC Programmable)
  • Display: 3-row, 4-digit bright LED display with Auto/Manual Scroll
  • Indications: Error Code Display, Fault LED Indicators
  • Mounting Type: Panel Mount
  • Faceplate: Polycarbonate Transparent
  • Case/Housing Material: FR-ABS Black
  • Connectors/Terminal: Nylon 666, 33%GF
  • Mounting Clamps: Sturdy, Moulded Glass filled nylon with screws
  • Working Temperature: 0°C to 50°C
  • Storage Temperature: -10°C to 60°C
  • IEC62052-11

Panel Cutout Dimensions

Terminal Connection

Applications and Industries where it is used

Building Management Systems (BMS)

  • Where: Inside the BMS-controlled main LT panel or HVAC/equipment control panels that distribute AC power to building systems.

  • Why: To protect motors, HVAC units, lighting circuits, and other critical loads from phase loss, voltage imbalance, over/under-voltage, or frequency deviations, preventing damage and ensuring uninterrupted building operations.

Motor Control Panels

  • Where: In Motor Control Panels (MCPs) for pumps, fans, compressors, and conveyors.

  • Why: To detect phase loss, reverse phase, voltage imbalance, or abnormal frequency and trip the motor circuit before faults cause winding damage, overheating, or unplanned downtime.

OEM Electrical Panels

  • Where: Inside OEM electrical panels of machinery such as packaging lines, CNC machines, lifts, and industrial ovens.

  • Why: To continuously monitor incoming AC supply quality and isolate the machine during abnormal voltage, phase, or frequency conditions, protecting sensitive components and reducing warranty claims or field failures.

Commercial Sub Metering / Retail Malls

  • Where:In commercial submetering panels and retail mall distribution boards feeding tenant shops, kiosks, and common-area equipment.

  • Why: To protect lighting, escalators, HVAC units, and tenant machinery from supply anomalies like phase loss, over/under-voltage, or imbalance, ensuring safety, reducing equipment downtime, and avoiding disputes over power quality issues.

Ordering Information

Model CT Input Range Display Aux Supply Dimensions (MM)
KEW-MPR (96×96) CT 1A–50kA / CT 0.5A–5A (Programmable) 3-Row, 4-Digit LED 80–300VAC / 24–240VDC (Universal) 96×96