Technilock® Model 844L4

Fail-locked, with control latch

Product description

Electro-mechanical door bolt for use in high security areas

Features of the fail-locked version:

The fail-locked version always keeps the door closed in case of a power failure. Here, the focus is on secure locking (security)

A secure closure is provided in the event of a power failure/fault

Very high locking pressure and high impact resistance

Static bolt load in accordance with DIN 18251 20,000N (destruction-proof)

Extended range of functions: Two additional functions ensure daily operations continue in the event of power failure and breakdowns. Emergency locking also takes place in the event of a breakdown.

Holds the bolt of opened door unlocked even during power failure

The cylinder function can be used to lock and unlock manually. After manual locking, the bolt in fail-locked version cannot be unlocked via the actuation signal. Manual locking can only be cancelled by unlocking via the locking cylinder

Mechanical steering device

Direct activation by a fire alarm/smoke detection system is not possible


  • Striking plate is not included in package and needs to be ordered separatly.
  • General appraisal certificate P-120003989.02 for use as a lock on fire and smoke protection doors.
Technical data
Variants that can be ordered