CNC Busbar Machinery 803U-3-C
Built for large-scale switchgear and transformer production lines that need high output, sustained heavy duty and long-term machine durability.
Quick Summary
The 803U-3-C is the flagship 3-in-1 for Thai switchgear and transformer plants running thick busbar continuously: 800 kN punches Ø4.3-34 mm holes in copper bar up to 20 mm thick and 250 mm wide, with German Siemens PLC bending control at ±1° (±0.5° repeat). Its three units work simultaneously or in sequence, so punching, shearing and bending no longer queue behind one operator, and the rigid frame is built for sustained duty rather than occasional jobs. At 2,100 kg on 3 x 5.5 kW it is the right step when bar thickness above 16 mm or two-shift production is normal.
Built for large-scale switchgear and transformer production lines that need high output, sustained heavy duty and long-term machine durability.
- 800 kN, handles bars up to 20 mm thick and 250 mm wide
- German Siemens PLC bending control
- ±1° bending accuracy (repeat ±0.5°)
- Simultaneous or sequential operation of 3 units
- Rigid frame for continuous heavy-duty use
- The flagship 3-in-1 for large factories
| Nominal force | 800 kN (80 tons) |
| Punching diameter | Ø4.3–34 mm |
| Max copper thickness | 20 mm |
| Max width | 250 mm |
| Max vertical bending | 12×120 mm |
| Bending accuracy | ±1° (repeat ±0.5°) |
| Power | 3×5.5 kW |
| Machine weight | 2,100 kg |
| Control | CNC + Siemens PLC |
Reference Figures by Test Condition
Values below are the manufacturer's nominal figures for the stated condition. Each paragraph is written as condition + value + comparison baseline so it can be quoted on its own. Baseline machines are other models in the same LTMC catalogue; these are factory specification figures, not third-party laboratory reports.
Capacity ceiling of the 3-in-1 range at 800 kN
Test condition: copper bar 20 mm thick x 250 mm wide, punching Ø4.3-34 mm at the rated 800 kN. Result: the 803U-3-C is the only 3-in-1 in this catalogue that reaches 20 mm thickness and 250 mm width. Baseline: the 503U-3-C stops at 16 mm x 200 mm and the 303U-3-C at 12 mm x 150 mm, so the 803U-3-C adds 60% force over the 503U-3-C and 2.7x the force of the 303U-3-C.
Bending control under Siemens PLC
Test condition: repeated bending of thick copper bar using saved programmes on the German Siemens PLC. Result: ±1° bending accuracy with ±0.5° repeatability, 12 x 120 mm vertical bending, and simultaneous or sequential running of all three units. Baseline: the manual 303U-3-C has no servo positioning and no published angle tolerance, so the gap is in repeatability across shifts rather than in single-part capability.
Duty cycle, power and weight
Test condition: continuous two-shift production of heavy busbar. Result: 3 x 5.5 kW installed power and a 2,100 kg rigid frame. Baseline: the 503U-3-C weighs 1,700 kg, so the 803U-3-C carries 24% more machine weight for 1.6x the force and is the model specified for long-term heavy duty.
What is the difference vs the 503U-3-C?
Higher force (800 vs 500 kN), handles bars up to 20 mm thick and 250 mm wide, with Siemens PLC bending. Built for continuous heavy-duty production.
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