Universal electromechanical mini lock

The only electromechanical mini lock on the market.

Due to the unique ratio of the overall dimensions, holding force, electric current consumption, and universal fastening, the lock can be used in many areas.


Promix-SM102 - photo - 50


“Promix-SM102” is the new name of the “Sheriff-2 light” series of locks.


► The only electromechanical mini lock on the market.

► Unique balance between the dimensions, holding force and input current

► Lock versions: normally closed (closed without supply voltage), normally open (open without supply voltage).

► Automatic adjustment of the deadbolt in case of inaccurate installation or sagging of the door

► Due to its miniature size and universal mounting, the lock can be used to restrict access to:

  • Luggage lockers, built-in cabinets, lockers in locker rooms, drawers for storage of documents, etc.
  • Refrigeration and retail equipment (cabinets, chests, showcases), including those with sliding doors
  • Cabinets for storage of medicines and chemicals
  • ATMs, electronic terminals, vending machines, process equipment
  • Cabinets for electronics, electrical panels and distribution switchboards
  • Elevators, locks
  • Table doors and drawers
  • and much more

Assembly options

Four options of the lock assembly and two deadbolts allow to easily install it in the desired location.

To ensure the normal operation of the lock in case of misalignment of the deadbolt and lock (for example, inaccurate installation or sagging of the door during operation), the deadbolt is made movable and self-aligning.

Designation of the lock model:


Promix-SM102.XY.Z color,   where:


X - lock version:  

0 - normally open, 
1 - normally closed;

Y - nominal supply voltage:

0 - 12 V, 
1 - 24 V;

Z - availability of built-in sensors: 

0 (n/a) - no sensors, 
1 - door sensor.

color - body color: 




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

X - lock version:  
Lock model  Description

Normally open (opens when supply voltage is removed),
supply voltage 12V



Normally closed (opens when supply voltage is applied),
supply voltage 12V



Normally open (opens when supply voltage is removed),
supply voltage 12V, built-in door position sensor



Normally open (opens when supply voltage is removed),
supply voltage 24V



Normally closed (opens when supply voltage is applied),
supply voltage 24V



Normally open (opens when supply voltage is removed),
supply voltage 24V, built-in door position sensor 

We can manufacture customized normally closed locks with emergency opening option (emergency opening rod as in Promix-SM101.10.3 lock)

Technical characteristics

All parts of the lock are made of high quality steel with protective electroplating or painted with powder enamel. The lock is covered by a 18-months warranty!

  • Deadbolt holding force (without body deformation): 150 kg
  • The force of holding the deadbolt by the locking mechanism: 300 kg
  • Input current (at 12V/24V): 0.1/0.05 A
  • Power supply voltage: DC 12±2V, 24±2V
  • Version: normally open, normally closed
  • Maximum sensor-switched current (DC): 0.5А
  • Maximum sensor-switched voltage (DC): 36V
  • Output signal of sensors: “dry contact”
  • body and bracket material: steel painted with polyester powder enamel
  • High reliability: < 400,000 cycles of operation
  • Operating temperature range, °C: -30...+50
  • body color: white, silver, brown




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, while normally open locks are unlocked by removing the supply voltage. For operation, the lock requires a power supply unit and an ACS controller.

To open the lock, the ACS controller must apply the voltage to the lock or remove it (depending on the lock design), and hold this state until the door is opened.


Promix-SM102 EN Operating Manual (download)

3D model of the Promix-SM102 (normally open).STEP  (download)

3D model of thePromix-SM102 (normally open with door position sensor).STEP (download)

3D model of the Promix-SM102 (normally closed).STEP  (download)


Photos and videos

The video on this page is presented by independent experts of the technical laboratory

The manufacturer has no relation to this video, but, nevertheless, considers it very useful. More information is available at

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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New patent has been obtained!


We got another patent for electromechanical lock with flexible steel deadbolt Promix-SM325.


This lock is used to secure electric scooters operating in Kicksharing (rental)

New Official Distributor in UK!!!


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.


New patent has been obtained!


Happy to announce that our company got approval of the new patent for electromechanical locking of the battery compartment of electric scooter.
All news
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