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Dual-setpoint frequency relay with fixed delays and 2 C/O outputs for grid protection.

Stock Code: MI91BJ

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The GIC MI91BJ provides under and over frequency monitoring with rapid fixed-delay protection and dual output relays for split control functionality.

🔧 Technical Highlights:

  • Supply Voltage: 230 VAC
  • Frequency Monitoring Range: 40 Hz to 70 Hz
  • Input Signal Range: 15–500 V
  • Under Frequency Threshold: Adjustable (-1 to -10 Hz)
  • Over Frequency Threshold: Adjustable (+1 to +10 Hz)
  • ON Delay: Fixed 500 ms
  • OFF Delay: Fixed 150 ms
  • Output: 2 x C/O relays
  • Mounting: DIN Rail

✅ Benefits:

  • Dual setpoint design enables fast trip on frequency drift
  • Supports wide range of waveform types
  • Perfect for protecting generators and critical AC loads

🚀 Applications:

  • Generator panels
  • Grid synchronisation and transfer systems
  • High-reliability control environments

MI91BJ enhances grid stability and load safety in frequency-variable environments.

Supply Voltage230Vac, 440Vac
Output Relay / ChannelsSPCO
Output Relay Rating5A @ 230V
MountingDIN Rail
Size22.5mm
ProtectionIP20, IP40
Weight0.15
Type File Name
Data Sheet frequencymonitoringrelays.pdf
Instruction Manual Instruction Manual_Frequency Monitoring.pdf

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