The SIL B is a Relay for Primary Distribution which is able to protect a feeder by means of current and voltage functions. It is normally used with a circuit breaker as cutting element. Main Characteristics: Protection functions available in SIL-B are the following: 50P (2), 50N/G (2), 67P (2), 67N (2), 46, 59P (2), 59N (2), 27P (2), 32/40 (4), 79, 50BF, 52, 49, 86 Cold Load Pick-up, 49T, 74TCS. Optionally: 81 U/O, 25, 37 and IRIG-B.79 protection function (Recloser) allows up to 5 attempts of reclosing which can be programmed by the user. Monitors differences in voltage magnitudes, phase angles, and frequencies to perform synchronism checks across the circuit breaker. This function can be coordinated with the auto-reclose function (up to five recloses). Is used with auxiliary power supply (110-230 Vac/ 90-300 Vdc and optionally 24-48 Vdc). SIL B has metallic box with high electromagnetic compatibility level (EMC) and wide range of operating temperature. Its reduced size makes the SIL B relay easy to install and its light weight helps the customer to save costs in transport. Direct signalling/control both of the circuit breaker (52 function), both of the recloser (79 function).  To allow the communication relays have a communication port on the front of the equipment. Two rear ports on the back for remote communication. Two communication protocols can be used simultaneously: MODBUS RTU IEC 60870-5-103, IEC 61850, DNP 3.0 or IEC 60870-5-104  Shows multiple measurements: Currents, voltages, phase current angles, Cos φ,  powers, frequencys, …. 8 configurable inputs and 7 configurable outputs. 2 Oscillographic records,  20 fault reports and non-volatile RAM memory: stores 1.000 events with date/time even without power supply thanks to its internal RTC.