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Single Phasing Preventor, 415VAC, 2 C/O outputs

MA51BC is a phase monitoring relay that detects phase loss, incorrect sequence and voltage imbalance to protect three‑phase equipment. Designed for 415 VAC, it allows adjustable trip thresholds and delays. The 2 C/O (DPDT) is rated 5 A at 250 VAC / 30 VDC.

Stock Code: MA51BC

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The GIC MA51BC is a single phasing preventor for 415 VAC systems. It detects phase loss and sequence errors and features dual changeover outputs for control and alarm logic.

🔧 Technical Highlights:

  • Supply Voltage: 415 VAC or 208–480 VAC
  • Functions: Detects phase loss and phase sequence errors; monitors asymmetry
  • Timing Range: Fixed or selectable ON delay (e.g., 0.5–15 s)
  • Output Contacts: 1 C/O or 2 C/O
  • Contact Rating: 5A @ 250 VAC / 28 VDC (resistive)
  • Compact design
  • LED indications

✅ Benefits:

  • Dual relays enable independent trip and annunciation
  • Protects motors and plant from single-phasing damage
  • Rugged design for industrial panels

🚀 Applications:

  • Water & wastewater skid panels
  • Compressors and blowers
  • General 3-phase motor starters

MA51BC provides reliable single-phasing protection with two versatile changeover contacts.

FAQs

  • Q: How is this product typically installed?
    A: It is intended for DIN rail or panel mounting depending on model 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 Voltage3x415Vac
Output Relay / ChannelsSPCO
Output Relay Rating5A @ 230V
MountingDIN Rail
Size36mm
ProtectionIP20, IP40
Weight0.12
Type File Name
Data Sheet voltagemonitoringrelays.pdf

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