22.2.8.2 Design M1819-3 v4The binary output module (BOM) has 24 software supervised output relays. Eachpair of relays have a common power source input to the contacts, see figure 381.This should be considered when connecting the wiring to the connection terminalon the back of the IED.The high closing and carrying current capability allows connection directly tobreaker trip and closing coils. If breaking capability is required to manage fail ofthe breaker auxiliary contacts normally breaking the trip coil current, a parallelreinforcement is required.For configuration of the output signals, refer to section "Signal matrix for binaryoutputs SMBO".xx00000299.vsd213Output moduleIEC00000299 V1 EN-USFigure 381: Relay pair example1 Output connection from relay 12 Output signal power source connection3 Output connection from relay 21MRK 505 394-UEN A Section 22IED hardwareLine differential protection RED650 2.2 IEC 825Technical manual