The invention discloses a small 
busbar combined all-insulated enclosed 
bus, and belongs to the technical field of buses and 
branch buses for low-
voltage electrical transmission and distribution. The small 
busbar combined all-insulated enclosed 
bus comprises a 
bus, bus interfaces, cable crimping outgoing line devices, bus vertical tees and bus vertical elbows, wherein the bus adopts a small copperbar combined structure design, the heat dissipation area of a single-phase small 
copper bar is several times that of an existing bus, the 
copper consumption can be properly reduced, and the product material cost can be obviously reduced. The bus has four phases and each phase has independent insulation and high 
mechanical strength. A 
bus interface adopts a non-insulating 
bolt connection scheme, and therefore the material cost is obviously reduced. The 
standardization rate is extremely high, the bus production process is simple, the production cost is low, the production efficiency is high, andthe stock fund 
utilization rate is greatly improved. The bus provided by the invention has the core concepts of independent innovation, cost reduction, benefit increase, safety and first in key scheme design of a bus structure, a wire outlet mode, an interface, a vertical tee joint, a vertical 
elbow and the like, and can truly realize enterprise commitment of maintenance-free and lifelong qualityguarantee of a product.