This is an original Relay + Filter Board for ABB Aurora inverters, featuring robust construction and high-quality soldering. The board carries power relays, EMI filters, chokes, surge components, and interface terminals, making it a critical part of the inverter’s power input and signal control stage.
Compatible with various ABB Aurora models, it serves as the interface between DC input, grid connection, and internal switching elements.
🔄 Condition: Used, refurbished in excellent condition. Fully inspected.
🔧 Technical Specifications & Visible Components:
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PCB Marking: 3G74-99-1 Pb-free
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Part Number: 3G7404A4
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Revision: AF
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Serial Number: 1720110186
🧩 Board Elements & Features:
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Impulse transformer: WQP15-015-01
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4x fuses (red, labeled F1–F4)
- 3x copper-wound chokes
- Blue X2 capacitors (275V)
- SMD resistors (e.g., 220), capacitors like C13
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Heavy-duty relays: HF115F series
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Power/logic terminals: BOOST1, BOOST2, +BULK, N.C.
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Connectors: J4, J27, RS485, Ethernet (ETH)
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Terminal blocks: CH1–CH4 IN, PE, AC, L, N, DC INPUTS, GRID
✅ Key Functions:
✔ Power relay switching for inverter stages
✔ Input filtering and EMI suppression
✔ Safe grid interface and signal isolation
✔ Communication support via RS485 and Ethernet ports
✔ Designed for reliability in high-voltage PV environments
🔗 Ideal For:
✔ Repair or refurbishment of ABB Aurora inverter systems
✔ Restoring AC/DC interface reliability
✔ Service and spare part stock for field maintenance
📦 Includes: Complete relay + filter board assembly (as shown, no cables)
🚀 Restore safe and stable operation to your inverter with this OEM relay and filter interface board by ABB.