User Manual

3UG4 / 3RR2 monitoring relays

Manual, 02/2013, NEB927043002000/RS-AA/002

187

3UG4625 residual current monitoring relay with

3UL23 transformer

9.1 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 9- 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 fires.