Which knife protects how well? Levels 0 to 3 classify cutting tools by their protection principle — from the unprotected cutter to the fully concealed blade. This overview helps safety officers and those responsible for logistics and production to determine the right level of protection for their application.
The classification into Levels 0–3 is a classification of the level of protection that has become established in the industry — not a legal standard. Your application and your risk assessment are what matter for the selection.
| Level | Protection principle | Mechanism | Typical use |
|---|---|---|---|
| Level 0 | No protection | Manual or fixed blade (e.g. cutter with snap-off blade) | Low safety requirement, maximum flexibility |
| Level 1 | High protection | Automatic blade retraction when the slider is released | For all kinds of cuts; safety depends on correct operation |
| Level 2 | Very high protection | Fully automatic protection after every cut — retraction or blade guard | Protection independent of the user; powerful cuts, heavy users |
| Level 3 | Highest protection | Concealed blade / protective hook — no contact with the cutting edge possible | Logistics, packaging, pharma; goods protection critical |
Level 0 tools have no retraction function: the blade stays open as long as it is extended. This includes classic cutter knives with a snap-off blade as well as tools with a fixed blade. A knife with automatic retraction also counts in practice as Level 0 if the user has to hold the trigger down permanently during the cut.
At Level 1 the blade retracts automatically as soon as the thumb releases the slider. After the cut the blade is therefore immediately back in the housing — cuts when putting the knife down or touching it by accident are reliably prevented. This requires correct operation: if the slider is held permanently, the blade stays open.
At Level 2 the blade is secured automatically after every cut — regardless of the user’s behaviour. Deliberately “protection” and not just “retraction”: besides retraction into the housing there is the blade-guard design, where a guard bar springs in front of the blade and locks there — even if the trigger is still being operated. This way Level 2 offers considerably more safety than Level 1.
Three designs achieve this level of protection:
Fully automatic retraction (spring) Blade guard / guard bar Ceramic safety bladeAt Level 3 the blade stays fully concealed throughout the entire cutting process. Cutting takes place only in the narrow channel of a protective hook — direct contact with the cutting edge is excluded by design, neither for the user nor for the goods underneath. This gives the highest protection against cuts and at the same time against damage to goods.
A first orientation by cutting task. If in doubt, the risk assessment decides — we are happy to advise you.
| Application / material | Recommendation |
|---|---|
| Powerful cuts (cartons, cardboard) | Level 2 — increased risk due to force required |
| Light materials (film, paper, sacks) | Level 2 — e.g. ceramic safety blade |
| Maximum goods protection (logistics, packaging) | Level 3 — concealed blade |
| Blade length over 30 mm absolutely required | Level 1 — only option for long blades |
There is no rule stating which safety level is required in which situation. However, the German Occupational Health and Safety Act (ArbSchG) obliges companies to ensure the safety and health of their employees — from which follows indirectly the duty to provide suitable work equipment. Which level of protection is appropriate results from your risk assessment.
We support you with the selection and with the risk assessment — and send you suitable samples to test in your own business.
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