The correct choice of lock is determined by the design of the door, its location and the presence of additional entrance doors in the room. If there is only one entrance door in the room, it is better to choose an electric lock with the ability to open with a key.

As a rule, locks of this design are “normally closed NC”, that is, a 12V electrical impulse is needed only at the moment of opening it. Locks of this type consume minimal or zero electrical current when closed.

If you install a lock without the ability to open it with a key - these types of locks are usually "normally open NO" - then in the absence of electricity such a lock will stop working and the door will open. To prevent this, you should additionally install a buffer power supply with a battery, for example

ZBF-12V-4A-17Ah. If the material and design of your door do not allow you to install a hidden-mounted lock, then you should choose an electromechanical rim lock. Such locks are universal and suitable for any type of door: left, right, opening inward or outward. Some models of electric locks can be installed in a door frame, for example XSBL12RM,  SBL12NMTL, RE-31G2, XS12R...