Versions; Applications - Siemens SIRIUS 3RT Series System Manual

8.2.2

Versions

There are two different device versions:
● Basic version: Analog setting current monitoring relay 3RR214.-.A.30
With two-phase apparent current monitoring, one changeover output, and analog
adjustment, basic version relays provide a high level of monitoring reliability particularly in
the rated and overload ranges.
● Standard version: Digital setting current monitoring relay 3RR224.-.F.30
Standard version relays support three-phase current monitoring with active current
monitoring available for selection as an option. They support further diagnostic options
such as residual current and phase sequence monitoring, and are also be used to
monitor motors even below rated torque. The devices have an additional separate
semiconductor output, an actual-value display, and support digital adjustment.
8.2.3

Applications

The various 3RR2 current monitoring relays are suitable for:
● Monitoring for current overshoots and undershoots
● Monitoring for cable breaks
● Monitoring for no-load operation and load shedding (as might be the case, for example, in
the event of a torn V belt)
● Underload monitoring in the lower performance range (if a pump was running in no-load
operation, for example)
● Monitoring for overload (as might affect pumps with a soiled filter system, for example)
● Monitoring the performance of electrical loads such as heaters
● Monitoring for incorrect phase sequences on mobile equipment such as compressors or
cranes
● Monitoring for high-impedance faults to ground (caused by damaged insulation or
moisture, for example)
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
SIRIUS 3RR2 current monitoring relays
8.2 Product description
685