The AC Side EMI Filter & Relay Board for ABB / Power-One Aurora TRIO 27.6 kW is a high-power electronic module designed for advanced filtering and grid interface management in three-phase photovoltaic inverters.
Installed on the AC output side, this board combines EMI filtering, surge protection, and relay-based grid connection control, ensuring that the energy delivered to the grid meets strict electrical and EMC standards.
With its integration of high-current toroidal inductors, suppression capacitors, and power relays, the module effectively reduces switching noise generated by the inverter and guarantees safe and compliant operation.
⚙️ Main Functions
- EMI/RFI filtering on the AC output
- Harmonic reduction and high-frequency noise suppression
- Stabilization of output voltage and current
- Controlled grid connection/disconnection via relays
- Protection against overvoltage and transient events
🔌 Role Inside the Inverter
Within the ABB Aurora TRIO 27.6 kW inverter, this board:
- Filters AC energy before grid injection
- Reduces noise generated by IGBT switching
- Protects the electrical grid and connected equipment
- Manages grid connection through relay switching
- Supports safety, synchronization, and compliance functions
👉 It is a critical module for power quality and operational safety.
🔧 Technical Features
- Industrial high-current PCB with reinforced insulation
- Modular structure (separate filtering and relay sections)
- Dual-stage EMI filtering design
- Large toroidal inductors (common-mode chokes)
- Class X/Y and film capacitors for EMI suppression
- High-capacity electromechanical relays (12 VDC coil)
- Three-phase power terminals
- Integrated surge protection components
🔍 Main Components
- Toroidal inductors → conducted noise filtering
- Power relays (e.g., 510S series) → grid connection control
- EMI capacitors (Class X/Y) → interference suppression
- MOV varistors → surge and transient protection
- AC power terminals → grid connection
- Interface connectors → communication with control board
- Dedicated relay board section → functional separation
⚠️ Typical Faults & Symptoms
Failures in this board may cause:
- Grid fault or EMI-related inverter errors
- Failure to connect to the grid
- Protection trips or safety shutdowns
- Stuck or worn relays
- Overheating of inductors or components
- Output instability or electrical noise
🛠 Product Specifications
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Manufacturer: ABB / Power-One (Aurora)
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Compatibility: TRIO 27.6 kW
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Type: AC Side EMI Filter & Relay Board
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Application: Three-phase grid-tie photovoltaic inverters
📊 Applications
- Repair of ABB Aurora TRIO inverters
- Industrial photovoltaic system maintenance
- Replacement of faulty AC filter/relay boards
- Restoration of EMC compliance and grid functionality
💡 Key Advantages
- Improves quality of power injected into the grid
- Reduces electromagnetic interference
- Ensures safe and compliant operation
- Combines filtering and switching in one module
📌 Summary
The ABB Aurora TRIO 27.6 kW AC Side Filter & Relay Board is a critical output-stage module that integrates:
✔ EMI filtering and harmonic suppression
✔ Grid connection control via relays
✔ Electrical protection and stability
👉 Essential for reliable, safe, and standards-compliant operation of photovoltaic inverters.
