3UG4625 residual current monitoring relay with
3UL23 transformer
8
8.1 Application areas
Application areas
Residual current monitoring relays are used in industry to:
• Protect systems from damage caused by fault currents
• Prevent production losses caused by unplanned downtime
• Perform maintenance to meet all demands
3UG4625 residual current monitoring relays are used in conjunction with 3UL23 residual
current transformers to monitor systems where environmental conditions increase the chance
of higher fault currents. The devices are used for applications including in the following areas:
Table 8-1 Application areas of 3UG4625 residual current monitoring relays
Cause of fault Application
• Dust deposits on terminals • Woodworking, grain mills
• Increased levels of humidity • Mining, power supply containers
• Capacitive fault currents as "basic fault load" • For large systems (line length)
• Porous cables and lines • Motor winding insulation
• Diminishing insulation caused by material wear • Furnaces
Note
3UG4625 residual current monitoring relays monitor devices and systems for their correct
function.
They are not suitable for personal protection or protection from res.
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 135
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