Predictive Maintenance Predicting failures and specifying causes SIRIUS ® contactors with remaining life time (RLT)* function (*remaining life time) These contactors switch three-phase a.c. feeders from 55 kW to 250 kW at 400 V. The RLT function measures the wear/erosion on the main contacts, and signals a pending replacement visually and electrically at the right time. RLT helps in planning maintenance measures and makes routine visual checks on the main contacts unnecessary. Product Website