4.2 Application areas
The 3RR2 current monitoring relays are used, for example, in the following applications:
• Monitoring for current overshoot and current undershoot
• 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 aect pumps with a soiled lter 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)
Table 4-1 Application areas of the 3RR2 current monitoring relays
Function Application
• Undercurrent
• Overcurrent
• Apparent current
• Active current (3RR22 only)
• Phase failure / wire break
• Phase sequence (3RR22 only)
• Internal ground fault detection (fault cur‐
rent) (3RR22 only)
• Block current (3RR22 only)
• Emergency lighting
• Heating systems (electroplating plants, plastic injec‐
tion machines, paintshops)
• Lamps (tunnels, OR lighting, trac lights, signal sys‐
tems, UV lamps, infrared radiators, laser lamps)
• Fan
• Pumps
• Sawing system
• Conveyor belt
• Surface grinding machine
• Breaking mill
• Milling machine
• Car wash
• Lifting platform
• Screw conveyor
• Crane
• Turning machine
• Woodworking
• Grain mills
• Steel industry
3RR2 current monitoring relays
4.2 Application areas
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 51
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