The guide on the industrial cardboard shredder page describes overload protection in two sentences that are easy to read past. The machine has overload protection: when a jam occurs, it automatically cuts power and stops, protecting the motor. It also uses a branded motor with ample power, so thick and hard cardboard feeds smoothly. The two sentences describe one of the most practical features on the machine, and the second sentence explains why it matters.
Start with what happens during a jam on a machine without overload protection. The cardboard stalls at the cutting area. The shaft stops turning because the material is blocking it. The motor, however, does not know that. It keeps drawing current and keeps trying to turn the shaft. The current rises, the windings heat up, and eventually the motor burns out or the thermal protection trips. On some machines, the failure is a burned motor. On others, the overheating damages the insulation and the motor fails weeks later. The page describes this directly. When jammed, the cutter shaft stops but the motor keeps running, risking motor burnout or even overheating.
Now what happens on a machine with overload protection. The current rises when the shaft stalls, and the protection circuit detects the rise. It cuts power to the motor before the windings overheat. The machine stops, the jam is cleared, and the machine restarts. The page describes this as automatically cutting power and stopping, protecting the motor. The phrase protecting the motor is literal. The protection exists to save the component that is most expensive to replace.
The second sentence explains why the protection rarely triggers. The machine uses a branded motor with ample power, so thick and hard cardboard feeds smoothly without repeated jamming at the feed inlet due to insufficient power. A motor that is undersized struggles on thick board, and the struggle is what causes the stall. A motor that is sized to the board does not struggle, so the jam is rare and the protection is a backup rather than a routine event.
The third part of the description is the test. A buyer can test the protection before installation by asking the supplier to demonstrate a jam. The supplier feeds a board that is deliberately too thick, the machine stops, and the supplier restarts it. That demonstration shows the protection is wired and working. After installation, the operator can test it the same way once, during the training period, with the supplier's guidance. The test takes a minute, and it confirms the feature is not just a line on the page.
The fourth part is the maintenance. The page states that daily maintenance is minimal, mainly keeping the feed area clean, regularly checking cutting components, and following standard cleaning guidelines. The overload protection does not need maintenance, but it does need to be checked, because a protection circuit that has failed silently is worse than no protection at all. The check is part of the periodic maintenance, not the daily routine.
The fifth part is the shaft. Aircosan shafts are large, one-piece units rather than thin blades, designed for a service life of over five years and processed through lathe machining, high-frequency treatment, quenching, blackening, and multiple other steps. The material is 40Cr rather than ordinary 45# steel. 40Cr has lower brittleness and stronger impact resistance, and its machining time is more than twice that of 45#. At the same 550mm width, Aircosan shafts are visibly larger and thicker than thinner competing units and cost about 30% more, which shows in the overall machine weight. A heavier shaft resists the stall that triggers the jam in the first place, which is why the protection and the shaft are described together.
Aircosan machines have side sheet metal that fits tightly with no gaps, so paper dust cannot enter the gears and cause abnormal noise or long-term wear. Die life is generally 1.0 to 1.3 million meters depending on material and usage. Aircosan runs its own parts processing factory, controlling part quality in-house rather than assembling from mixed outside sources. The company supports logo customization from one piece and color customization from ten pieces. Products carry CE, ROHS, and UKCA certifications and hold an exclusive EU patent. After-sales responds within 12 hours and connects customers directly with engineers.
For a buyer, the practical approach is to ask the supplier to demonstrate the jam, then check the protection again after the training period. A feature that is tested is a feature that is trusted, and the page has already described what it does.