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ABB CM-PFE Three-Phase Monitoring Relay 

1. Key Parameters

• Product Model: CM-PFE
• Product Series: ABB CM-Series Industrial Three-Phase Monitoring Relays (AC System Fault Detection)
• Core Function: Monitors phase loss/sequence/imbalance, overvoltage/undervoltage; 1× changeover relay output; DIN rail mounting; compatible with 3-phase AC systems.

2. Core Features

• Multi-Fault Monitoring: Integrates phase loss, imbalance, overvoltage, and undervoltage detection in one unit, covering common three-phase system faults.
• Adjustable Thresholds: Customizable imbalance (≤20%) and voltage deviation (+/-10%~+/-30%) settings adapt to diverse equipment requirements.
• Fast Response: ≤2s response to phase loss minimizes motor burnout risk; ≤5s response to other faults reduces system damage.
• Compact Design: 22.5mm narrow width fits dense DIN rail layouts in control cabinets, saving installation space.

3. Application Fields

• Three-Phase Motor Protection: Monitors pumps, fans, and conveyor motors in manufacturing lines, preventing damage from phase loss or voltage fluctuations.
• Industrial Distribution: Guards 3-phase power supply circuits in factories, alerting to faults before they affect production equipment.
• HVAC Systems: Protects three-phase compressors and chillers in commercial buildings, ensuring stable air conditioning operation.

4. Precautions

• Compatibility: Use only in 3-phase AC systems (208V~480V); not suitable for single-phase circuits to avoid misoperation.
• Installation: Ensure correct phase sequence wiring (L1/L2/L3); separate relay wiring from high-power cables to reduce EMI.
• Maintenance: Test fault response quarterly (via ABB test function if available); clean terminals monthly to prevent false alarms.
• Spare Parts: Use genuine ABB CM-PFE units—non-genuine relays may miss faults or trigger false alarms, risking equipment damage.

The structure and details of the product：

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