The SO-52v11-S synchronizer is a specialized device designed to control and monitor the process of connecting two power lines. Its task is to protect the circuit breaker against the flow of inadmissible current at the time of switching.
The SO-52v11-S synchronizer is designed to perform the function of synchronous switching on of circuit breakers in power switchgear bays of all voltage types. The device controls a circuit breaker synchronized to a bus or bay reference voltage. At the power station, the device can function in a central synchronization system or as a field synchronizer. Implemented, standardized communication protocols allow for full cooperation with superior systems of various manufacturers. The product is intended for applications in difficult environmental conditions, in the presence of high dust, moisture and electromagnetic interference. 
The SO-52v11-S-1 circuit breaker synchronism controller is designed to perform the function of synchronous switching of circuit breakers in power switchgear bays of all voltage types. The device controls the circuit breaker with synchronization to the bus reference voltage. At the power substation, the device can function in a central synchronization system or as a field synchronizer.
The circuit breaker synchronism controller is made as a set of modules placed in a closed 10”/6U type housing. Depending on the field type, the number of binary input/output modules may be different. The minimum configuration has one MWS input packet and one MSS output packet.
The following types of modules can be placed in the housing:
The measurement and communication module performs measurements, calculations, necessary control algorithms, internal communication with other synchronizer modules and the required external communication. The transmission links of the module enable the creation of redundant communication with the device.
The controller can be equipped with a graphic terminal and additional binary input or output packages. 
The SO-5431 synchronizer is designed to control and monitor the process of connecting two power lines.
Parameters that are subject to control:
Based on the controlled parameters, the device gives a signal of readiness to connect both lines. The main task of the system is to generate a closing impulse for the circuit breaker when the defined amplitude, frequency and phase conditions of both measured voltages are met. alternating variables that uniquely identify the synchronism of the network.
These conditions are defined as follows:
Permission to close the circuit breaker is generated only when all conditions are met simultaneously.
The SO-5431 device has been replaced by the SO-52v11-S-1