Combiner cabinet components—DC combining + AC power distribution (Source: Douyin): Standard practice: Positive and negative copper busbars (Source: Trilpeak); Core component: gBat fuse (Source: Mersen); Protection: SPD lightning protection (Source: ABB).
I.
DC Combining Unit
Circuit Breaker: DC circuit breaker for isolation and protection (Source: ABB); Fuse: gBat fuse (IEC 60269-7) (Source: Mersen); Busbar: Positive and negative copper busbars (Source: Trilpeak); Disconnector: Rotary disconnector (Source: Soutya); Lightning Protection: OVR PV T1-T2 (Source: ABB)—DC section: Circuit breaker + Fuse + Busbar (three core elements).
II.
AC Power Distribution Unit
Contactor: AC contactor (Source: Soutya); MCB: 4-pole MCB (Miniature Circuit Breaker) (Source: Soutya); RCCB: RCCB 40A 30mA (Source: Soutya); SPD: 385V AC SPD (Source: Soutya); UPS: Uninterruptible Power Supply (Source: Douyin)—AC section: Contactor + MCB + SPD (three devices).
III. Copper Busbars
Positive Busbar: Positive polarity busbar collection (Source: Trilpeak); Negative Busbar: Negative polarity busbar collection (Source: Trilpeak); Cross-section: ≥25mm² for 1000V systems (Source: Kuangya); Specifications: 25/35/50mm² (Source: Kuangya); Low Resistance: Low-impedance copper busbar (Source: Kuangya)—Copper Busbar: Positive/Negative + Cross-section + Low Resistance (Three Key Points).
IV.
Protection Devices
Breaking Capacity: Short-circuit breaking capacity of 20–50kA (Source: Synode); Main Switch: Main switch E4.2 1500V 3200A (Source: ABB); Feeder: Feeder switch Tmax PV (Source: ABB); Diode: Unidirectional diode (5–10x rating) (Source: Douyin); Arc: Arc flash mitigation (Source: ABB)—Protection: Breaking Capacity + Main Switch + Diode (Three Layers of Protection).
V.
Monitoring Modules
Hall Effect: Hall-effect sensor for string current (Source: CSIV); Voltage: Busbar voltage acquisition (Source: CSIV); Status: Circuit breaker and SPD health monitoring (Source: CSIV); RS485: RS485 Modbus RTU (Source: CSIV); Alarm: String current imbalance alarm (Source: CSIV)—Monitoring: Hall Effect + Status + RS485 (Three Functions).
VI. Supporting Accessories
Indicator Light: Switch indicator light (Source: Douyin); Liquid Cooling: Power supply for liquid cooling unit (Source: Douyin); High-Voltage Box: Power supply for high-voltage box (Source: Douyin); Cabinet: IP65 enclosure protection (Source: Huyu);
Base: IK10 impact resistance (Source: Huyu)—Accessories: Indicator light + power supply + cabinet (three-part set).
VII. Procurement Recommendations
First, specify DC components (circuit breakers, fuses, busbars); second, configure AC components (contactors, MCBs); third, select copper busbars (≥25mm²); fourth, add lightning protection (T1-T2 SPD);
fifth, install monitoring (RS485)—Combiner Cabinet: DC components + copper busbars + monitoring (three core elements).
