230V 400V AC Combiner Box 4 In 1 Out

The 230V 400V AC Combiner Box 4 In 1 Out, supplied by China manufacturer Zhejiang Soutya New Energy LLC, is a low-voltage AC power-aggregation unit built for on-site generation and distribution networks. The enclosure is moulded from UV-stabilised, flame-retardant polycarbonate and sealed to IP65, giving long-term resistance to solar irradiation, rain and airborne dust. Inside, four selectable 4 pole AC molded case circuit breakers (160-250A) act as string or feeder switches, while a single outgoing 4 pole molded case circuit breaker (630-1000A) provides short-circuit, overload and isolation duty for the combined load. A Type 2, 4-pole 275 V AC surge protective device clamps induced lightning and switching transients, protecting downstream meters, inverters and sensitive loads. Factory-wired neutral and PE busbars ensure dependable grounding continuity and balanced phase distribution. Engineered for four-input AC sub-arrays, small-scale CHP clusters, or multi-inverter PV systems, the box offers essential manual isolation, over-current protection and equipotential bonding in one wall-mount package.

Application scenarios

1.Small-scale commercial rooftop PV – Multi-inverter AC hub

Surface-mounted on external walls or beneath parapet gutters, the 4-in-1 box merges four 160 A–250 A micro-inverter strings into a single 630 A feed. Each 4-pole MCCB gives individual MPPT isolation during inverter swap-outs, while the outgoing breaker and 275 V Type 2 SPD protect the combined bus from utility-side surges and short-circuits, keeping the rooftop system code-compliant and maintenance-friendly.

2.Cogeneration skid – Parallel generator coupling

Bolted to a vibration-damped frame between four gas-engine CHP units, the combiner unites 400 A generator outputs into one 1000 A supply for site load. Adjustable magnetic releases tolerate engine start-up in-rush; the Type 2 SPD clamps network re-closure transients, ensuring uninterrupted heat and power delivery to district heating loops.

3.Temporary construction feeder – Site distribution kiosk

Installed inside a GRP site kiosk at ground level, the box collects four 200 A branches (tower crane, hoist, site offices, batch plant) into an 800 A main ahead of the utility meter. Lockable rotary handles provide visible isolation for shift changes, while the surge suppressor guards overhead temporary cables against summer lightning strikes.

4.Agricultural processing complex – Motor-load aggregation

Wall-fixed on a grain-dryer platform, the enclosure feeds four 250 A motor circuits (conveyors, fans, pumps) into an 800 A backbone. Thermal-magnetic MCCBs cope with high starting currents of 150 kW fans, and the 275 V SPD prevents flash-over from utility switching during harvest season when downtime is critical.

5.EV fast-charging plaza – AC phase balancing node

Recessed into a charger plinth, the unit combines four 250 A charger feeds into one 1000 A riser before revenue metering. Four-pole breakers maintain isolated neutrals for each charger group, simplifying phase-current balancing, while the Type 2 SPD protects power modules and payment terminals from voltage spikes generated by simultaneous high-power vehicle connections.