ABB CMA120: High-Accuracy Current Measurement Adapter
The ABB CMA120 is a compact current measurement adapter designed for precise current monitoring and protection relay integration in medium-voltage (MV) and low-voltage (LV) power systems. Part of ABB’s CMA series, this device ensures reliable signal conditioning, galvanic isolation, and seamless compatibility with protection relays, energy meters, and SCADA systems.
Technical Specifications
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Parameter
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Specification
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Rated Primary Current
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5 A to 200 A (configurable)
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Rated Secondary Current
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1 A or 5 A (selectable)
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Accuracy Class
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Class 0.5 (measurement), Class 5P10 (protection)
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Frequency Range
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50/60 Hz (±5%)
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Isolation Voltage
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3 kV AC (1 min)
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Operating Temperature
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-25°C to +70°C
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Mounting
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DIN rail or panel-mounted
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Certifications
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IEC 61869-2, IEC 61010-1, CE, RoHS
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Key Features
1. Precision Measurement
- Dual Accuracy: Supports Class 0.5 for energy metering and Class 5P10 for protection relays.
- Wide Current Range: Configurable primary current up to 200 A for versatile applications.
2. Robust Design
- Galvanic Isolation: 3 kV isolation between primary and secondary circuits for safety.
- Compact Form Factor: Space-saving design for crowded control panels.
3. Easy Integration
- Plug-and-Play: Pre-calibrated outputs for quick installation.
- Compatibility: Works with ABB REF615, REX521, and third-party protection relays.
4. Diagnostics & Safety
- LED Indicators: Visual status for power, fault, and signal integrity.
- Overload Protection: Withstands short-term overloads up to 20x rated current.
Applications
- Switchgear Panels: Current measurement for circuit breakers and contactors.
- Renewable Energy: Integration into solar/wind farm protection systems.
- Industrial Plants: Motor load monitoring and feeder protection.
- Smart Grids: Signal conditioning for digital substations (IEC 61850).
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