Circuit breaker can only be controlled with DIRECT ON/OFF commands. This is due to the limitations in the IEC 60870-5-103 standard. In case the IED’s internal (IEC 61850) circuit breaker control model is set to Select-Before-Operate, the IEC 60870-5-103 stack will internally emulate both SELECT and OPERATE commands toward the circuit breaker. To the IEC 60870-5-103 client the control operation always appears to be DIRECT.