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

MI91BJ is a frequency monitoring relay that supervises system frequency and trips when it deviates beyond set limits. It supports 50/60 Hz networks and uses a 2 C/O (DPDT) rated 5 A at 250 VAC / 30 VDC.

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:

  • Functions: General function not specified

✅ 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.

FAQs

  • Q: How is this product typically installed?
    A: It is intended for DIN Rail in industrial control cabinets.
  • Q: Where is it commonly used?
    A: It is used in automation and control panels where dependable switching, monitoring, or indication is required.
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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