SIRIUS 3UG4 monitoring relays

The field-proven SIRIUS monitoring relays for electrical and mechanical quantities enable constant monitoring of all important characteristic quantities that provide information about the functional capability of a plant. Both sudden disturbances and gradual changes, which may indicate the need for maintenance, are detected. Thanks to their relay outputs, the monitoring relays permit direct disconnection of the affected system components as well as alerting (e.g. by switching a warning lamp). To respond flexibly to brief faults such as voltage dips or load changes, the monitoring relays have settable delay times. This avoids unnecessary alarms and disconnections while enhancing plant availability.

The individual 3UG4 monitoring relays offer the following functions in various combinations:

• Undershooting and/or overshooting of liquid levels
• Phase sequence
• Phase failure, neutral conductor failure
• Phase asymmetry
• Undershooting and/or overshooting voltage limit values
• Undershooting and/or overshooting of current limit values
• Undershooting and/or overshooting of power factor limit values
• Monitoring of the active current or the apparent current
• Monitoring of the residual current
• Monitoring of the insulation resistance
• Undershooting and/or overshooting of speed thresholds

Article No. scheme

Note:

The article number scheme shows an overview of product versions for better understanding of the logic behind the article numbers. For your orders please use the article numbers quoted in the selection and ordering data.