The MSA-12i B/C/D are meant for optical and acoustic signalling of operation of protections, as well as signalling failures and interferences in work of devices operating in the power and industrial objects. The devices enable creating grouped signals accordingly to operators’ needs, as well as for multiplication of signals for the remote signalling purposes. Those devices are successfully used in power stations and substations as a basic signalling systems, providing the personnel with precise and fast information on appearing threats, operations of protection devices or failures.


The MSA-12i B/C/D are independent, totally autonomic devices, with their own internal power supply, blinking light generator, probe and reset pushbuttons as well as a small internal acoustic signalisation. The devices have been designed in a way, that they can be used in mimic tables, to replace old, exploited electromechanical signalling blocks.

The "B” version of MSA-12i has the same junction and its addresses as the older version - MSA-12, and can be exchanged with the older version, despite increased number of functions.

In the "C” version the junction has been enlarged to 18-pins, what enabled separating the supply circuit, and division of incoming circuits into two, isolated groups. It enables supply of the device with an supply voltage independent from the signalling voltages. The “D” version has an additional internal relay card, as in more complex signalling devices. It enables grouping and generation of bulk signals Aw(Aw1)/Al(Ww2) Up. The “D” versions additionally has a communication port enabling configuration and monitoring of the signalling block.