Locks

Electronic combination lock

Last reviewed on 10. August 2026 2 min read by Tim Herberger, Fachredaktion bei Bremer Tresor

Ease of use and a wide range of functions make this lock mechanism one of the most popular locking variants for safes. At the same time, it is worth noting that, thanks to continuous technical developments, the electronic combination lock is now considered one of the most secure locking systems for safes.

Operation

Functions

Due to the software built into the electronic combination lock, numerous functions can be integrated. The electronic combination lock we use has a master code that can be used in an emergency. In addition, depending on the lock version, multiple user codes can be created, allowing several people to access the safe, each with their own individual code.

If the battery voltage drops to a level where only a limited number of opening and closing operations are possible, an acoustic signal will inform you of the voltage status so that you can replace the battery in good time. Depending on the lock type, if the battery is completely discharged, the lock can either be powered from the outside with a 9-volt block battery, or you can remove the keypad and provide power to the lock on the back with a 9-volt block battery. Find out more at Opening a safe when the battery is empty.

Design

Technical information

An electronic combination lock consists of two main components: the locking unit and the digit unit or keypad.

The software and the locking mechanism are housed exclusively in the locking unit, while the security-relevant components are installed deep inside the safe. The digit unit itself is attached to the outside. In the event of wear or a defect, this component can be easily replaced (even when the safe is locked).

Electronic combination lock with numeric keypad on the safe door
Only the keypad is on the outside, replaceable even when the safe is locked
Locking unit of an electronic combination lock in the locked state
The locking mechanism is housed securely inside the door
Locking unit of an electronic combination lock in the unlocked state
When unlocked, the locking bolt releases the latch
Assortment

Safes with an electronic combination lock

At Bremer Tresor, every safe model can be equipped with a high-quality electronic combination lock. Depending on the lock model, the lock engages automatically or the automatic locking is triggered by pressing a button.

Take a look at our safes with electronic combination lock.

In case of damage

What to do in case of a defect

In the event of complete discharge, the lock can be externally powered from the outside. You can find detailed instructions with a video at Opening a safe when the battery is empty.

If the problem cannot be resolved this way, the Bremer Tresor consulting and service team is always at your disposal. You can find our contact form under Safe repair.

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More on this topic

Overview article Safe locks
Tim Herberger
Tim Herberger
Fachredaktion bei Bremer Tresor

Tim Herberger schreibt die Ratgeber von Bremer Tresor. Er bereitet Normen, Vorschriften und Praxiswissen so auf, dass daraus eine klare Kaufentscheidung wird, und gleicht jeden Text mit unseren Fachleuten aus Beratung und Service ab.

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Frequently asked questions

What happens when the battery is empty?
The safe remains accessible. Beforehand, an acoustic signal warns that only a limited number of openings are still possible. If the battery is completely discharged, the lock can be powered from the outside using a 9-volt block battery, depending on the model, or the keypad can be removed and the battery applied to the back. Instructions with a video can be found at Opening a safe when the battery is empty.
Can multiple people have their own codes?
Yes, depending on the model, multiple user codes can be set up. Each person then opens the safe with their own code. In addition, there is a super code for emergencies.
Is an electronic lock less secure than a key lock?
No. Due to continuous technical development, the electronic combination lock is now considered one of the most secure locking systems for safes. The security-relevant components are located deep inside the safe, while only the keypad is on the outside.
What does it cost if the keypad breaks?
The keypad unit is purely a wear part and can be replaced without any problems, even when the safe is locked. The software and locking mechanism are located in the locking unit and remain unaffected by this. Our service team can provide you with prices via Safe maintenance and repair.
Can I retrofit an existing safe?
Yes, for most models. Switching from a double-bit lock to an electronic combination lock is possible for an additional charge