It combines a hinge with position sensing so the control system knows the guard is closed.

Machinery guards must not simply be closed.

The machine has to know they are.

Opening the guard signals the control system directly.

That signal is what stops or prevents dangerous motion.

The hinge and the interlock become one component.

Because a separate interlock mounted accessibly can be defeated.

A spare key or a cable tie is enough on many conventional switches.

A hinge-integrated switch is largely inaccessible without dismantling.

That makes casual defeat considerably harder.

It also removes the separate mounting and alignment task.

Fewer components means fewer things to misalign or damage.

Yes - machinery safety standards address foreseeable misuse explicitly.

An interlock that is trivially bypassed does not satisfy them.

That holds regardless of how well it works when used properly.

Operators defeat guards that make their work harder.

Designing against that is part of the requirement.

It is a design obligation rather than an assumption about behaviour.

Certified design so failures are detected or lead to a safe state.

That is different from an ordinary position sensor.

Safety components are specified against a required performance level.

That level comes from risk assessment for the specific machine.

A standard sensor cannot substitute for a rated one.

The certification documents are part of the machine's technical file.

Fully - it carries the guard's weight and sets its alignment.

It has to survive the same cycles as any other hinge.

Mechanical rating and switching rating both apply.

A hinge that sags misaligns the guard it is sensing.

Guard weight and size drive the mechanical selection.

Both specifications have to be satisfied rather than just the safety one.

Wiring into the correct safety circuit and verifying the resulting stop.

It is safety-critical rather than merely functional.

Verification that opening the guard produces the intended stop is part of commissioning.

Documentation of that verification is normally required.

Periodic testing is generally required afterwards.

Requirements differ between markets and the local regime governs.

It depends on the risk assessment and the guard's construction.

Large guards may need more than one sensing point.

A guard that could be sprung open elsewhere needs additional measures.

The assessment determines how many and where.

Redundant channels are required at higher performance levels.

That is a machine safety design question rather than a hardware selection one.