Combiner box components—fusing, circuit breaking, and lightning protection (Source: Sungrow): Golden Rule—five major modules (Source: Kuangya); Core—fuse protection for each string (Source: LVMA); Note—SPD 40kA (Source: CNLONQ).
I.
Fuses
gPV: gPV fuse holder and link (Source: Kuangya); Specifications: DC 1000V 20A/32A (Source: LVMA); Dimensions: 10×38mm 15A (Source: BENY); Indication: LED blown-fuse indication (Source: BENY); Touch-safe: BR-30 touch-safe fuse (Source: BENY)—Fusing: gPV + specifications + indication (three key points).
II.
Circuit Breakers
MCB: DC MCB 63A/100A (Source: LVMA); MCCB: Molded Case Circuit Breaker 1500V (Source: Synode); Load: Load-break switch/circuit breaker (Source: Sungrow); Isolation: DC disconnector (Source: Eabel); Short-circuit: BD BB1 series short-circuit protection (Source: BENY)—Circuit breaking: MCB + MCCB + isolation (three types of protection).
III. Lightning Protection Device
SPD: Type II DC SPD (Source: Trilpeak); Standard: IEC 61643-31 (Source: Trilpeak); 40kA: 40kA surge capacity (Source: CNLONQ); Clamping: Transient overvoltage <4kV (Source: Synode); Grounding: PE grounding rail connection (Source: Trilpeak)—Lightning protection: SPD + Standard + 40kA (Three capabilities).
IV.
Busbar
Busbar: DC positive and negative busbars (Source: Trilpeak); Material: Thick copper or aluminum metal strips (Source: Kuangya); Parallel Connection: Parallels outputs from all strings (Source: Trilpeak); Capacity: Matched to total output current (Source: Eabel); Wiring: Connection holes on copper busbars (Source: Sungrow)—Busbar: Polarity (Pos/Neg) + Material + Capacity (Three key points).
V.
Monitoring Module
Monitoring Board: Data acquisition via monitoring board (Source: Sungrow); Accuracy: Measurement accuracy ±0.5% (Source: Kuangya); RS485: RS485 communication terminals (Source: Sungrow); PLC: DC PLC communication module (Source: Sungrow); Sensing: Isolated measurement via Hall sensors (Source: Acrel)—Monitoring: Acquisition + Accuracy + Communication (Three systems).
VI. Auxiliary Components
Power Supply: Control power supply 15V/24V (Source: Kuangya); Grounding: Equipotential grounding point (Source: Sungrow); Terminals: DC output terminals (Source: Sungrow); Cables: Cable entry (Source: Kuangya); Irradiance: Irradiance and temperature sensor interface (Source: Acrel)—Auxiliaries: Power supply + Grounding + Terminals (three auxiliary components).
VII.
Procurement Recommendations
First, select fuses (gPV 20A); second, equip with circuit breakers (MCB 100A); third, install SPDs (40kA); fourth, specify busbars (copper);
fifth, implement monitoring (RS485)—Combiner Box: Fuses + Circuit Breakers + Lightning Protection (three core components).
