Electromechanical lock with pusher and door position sensor

Designed to restrict access to luggage lockers (parcel automats), drawers for storage of documents, lockers in locker rooms of fitness clubs, schools, enterprises, with the possibility of their remote opening.



Promix-SM308 - photo - 50


The lock is installed on the inner surfaces of the cabinet perpendicular to the door. The counterpart (deadbolt) is installed on the door.

Principle of operation: when the supply voltage is applied, the lock unlocks the door and pushes it out with the built-in pusher. Thus, the open door is immediately visible and there is no need to install a handle on the door.

The lock is equipped with a door position sensor with “dry contacts”.



Lock connection options  

(power voltage can be applied to the lock by a switch, intercom, controller, etc.)


Normally closed locks are unlocked by applying the supply voltage. For operation, the lock requires a power supply unit and an ACS controller.

To open the lock, the ACS controller must supply the supply voltage to the lock for a time not exceeding that specified in the technical specifications.

For emergency manual opening of the lock, it is necessary to shift the lever through the lock groove:


Designation of the lock model:

Promix-SM308.XY.Z color,   where:


X - lock version: 

 1 - normally closed;

Y - nominal supply voltage:

0 - 12 V; 

Z - availability of built-in sensors: 

1 - door position sensor.

color - body color: 





The modifications of locks available for order are shown in the table (see colors above):

Lock model  Description

Normally closed (opens when supply voltage is applied),

supply voltage 12V, built-in door position sensor




  • Flat shape, different colors and small dimensions allow to install the lock on any cabinet;
  • No backlash of the closed door;
  • Built-in door position sensor;
  • Installation on metal and chipboard furniture;
  • Low power consumption;
  • Corrosion-resistant coating of lock parts;
  • No necessity for preventive maintenance and lubrication for the period of operation.


Technical characteristics

Deadbolt holding force, kg, at least 250

Initial ejection force of deadbolt, kg, minimum 1.2

DC supply voltage, V 10-14

Supply voltage pulse duration, 1-10 sec

Interval between pulses of supply voltage, 15 sec

Input current (at 12V), mA, maximum 250


Promix-SM308 Operating Manual EN (download)

3D-model of the Promix-SM308 (normally closed with door position sensor).STEP (download)

Photos and videos

We will be glad to see you as a client of Promix Engineering and Production Center
You can see the full range of Promix equipment and locks in our catalog
If you have any questions, you can contact a Promix manager by + 7 (4812) 619-330
You can also leave a request using the feedback form
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We are thrilled to introduce our new Official Distributor in United Kingdom - Electric Locking Systems LTD!!!
Happy to be presented on the UK market and bring Promix products to british customers.


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