trapped-key system and Safety Interlocks
Welcome to Haake Technologies in Germany.
Manufacturer of trapped-key system, locks, safety mats, safety edges and bumpers
A few words
When we started, in 1987, to translate our ideas into products, we did not have a clue as to where our entrepreneurial trip would end. At the time, production, design, and sales took place in our parentsí garage! Ourís would have been a short story, if not for the support of our very first customers and suppliers. Because of their original commitment to us, absolute customer orientation is the number one priority for our colleagues and us.
Since our founding, several product groups have been designed and successfully launched in the machine safety devices market
With our subsidiaries and distribution partners in the major industrial countries, we are able to serve our customers in all aspects of labor safety.
As a family-owned company, we attach the highest importance to quality, and for this reason we are proud to connect our own name with our products and services.
We look forward to your enquiries.
We also welcome your comments and any criticism, as this will help us to improve and to create new solutions.
Here you can find our entire range of produkts.
Here you can find descriptions of trapped-key system, safety locks, safety mats, safety edges and bumpers.
SAFETY INTERLOCKS and trapped-key system
Such guard locking devices are for instance key-operated mechanical interlocks, also
called trapped-key systems. They are based on the easy-to-understand premise that a
key cannot in two places at the same time - it can for instance be inserted in a switch OR
be used for opening a guard.
Another safety-relevant feature is that a key can only become free in a safe condition,
when there are no hazards - a switch is turned off, a guard interlock is closed and
The big advantage of the system is the fact that a certain sequence of steps can be predetermined when designing the system. It is not possible to deviate from this sequence -
thus a high degree of integrity is achieved. So virtually any hazard can be eliminated.
key exchange box
key exchange unit
key transfer system
key transfer systems
mechanical door interlock
mechanical door interlocks
safe magnetic switches
safety of machinery
tounge-operated-switches with solenoid
bolt interlock HST-B
door interlock HST-TS
door interlock HST-TZ
guard locking devices
key switch HST-S
key switch with solenoid
key-operated mechanical interlocks
personal safety key
Advantages of Haake trapped-key system
Benefits offered by the trapped-key system, e.g. trapped-key system:
- high safety, individual codes
- only pre-determined sequences securing safety are possible
- no spare tongue "in the pocket"
- no cables to the individual guards (cost saving, faults prevented)
- easy retro-fitting
- guard interlocks have locking feature
- particularly suited when there are different energy sources for the machine (electric, pneumatic, ...)
- in areas where people might get trapped: personal safety key
- simple possibilities for teach in
- time delay due to key transfer between switch and guard interlock - run-down
processes come to a standstill (if necessary, extend by additional unit)
Haake offers safety interlocks (e.g. trapped-key system) with multifold applications for:
Oil / gas
Power generation / distribution
The switch HST-S is used for isolating the machine, in order to permit safe
access. After the voltage has been switched off, the previously trapped key
can be removed and used for the next step in the sequence, e.g. opening a
The unit is available as an enclosed (IP 65) or a panel mount version.
Versions with multiple locks (enclosed version sheet-steel up to 4, panelmount
version up to 10) are also available.
Further, versions in explosion-proof enclosures (ATEX zones 21 & 22 and 1
& 2) can also be supplied.
Here you will find information about trapped-key system and: