This is an original Relay + Filter Board for ABB Aurora 3.0kW inverters, marked 3G74-99-1 Pb-Free, manufactured using lead-free, environmentally safe soldering. It plays a key role in DC input conditioning, BOOST voltage management, and relay-based signal switching.

Equipped with ferrite-core inductors, EMI-rated capacitors, and mid-current relays, this board ensures stable and filtered voltage is safely delivered to the power stage.

🛠️ Common inverter issues resolved by this board include:
E013, E019, E023, E031, and Riso Low
(also displayed as 013, 019, 023, 031, Riso Low)

🔄 Condition: Refurbished — professionally cleaned, tested, and restored.

🔧 Technical Features & Markings:

• PCB Label: 3G74-99-1 (Pb-free)
• Compatible with: ABB Aurora 3.0kW inverter models
• Power Input Labels: BOOST1, BOOST2, +BULK, N.C.
• Connectors: J4, J27
• Key Components:
  • Ferrite-core inductors
  • Blue X2/Y2-class capacitors
  • 2x black mid-current relays
  • SMD resistor marked “220”
  • High-current copper traces on rear
  • SMD ICs, zener diodes, signal drivers

✅ Key Benefits:

✔ Solves frequent inverter faults: E013 / 013, E019 / 019, E023 / 023, E031 / 031, Riso Low
✔ Designed for safe high-voltage signal routing
✔ Ensures proper relay triggering and BOOST voltage regulation
✔ Restores stable operation to aging or faulty inverters

📦 Includes: Relay + Filter board with all mounted components
⚖️ Approx. weight: 1kg
🛠️ Installation: Slot-in replacement (qualified technician recommended)
🏷️ Condition: Refurbished & tested

🚀 Fix common Aurora 3.0kW inverter failures and ensure long-term reliability with this original ABB relay/filter module.