Residual current monitoring relays are used in conjunction with residual current transformers to monitor systems where ambient conditions increase the chance of higher fault currents.

Residual current monitoring relays monitor devices and systems for their correct function.

They are not suitable for personal protection or protection from fires.

Additionally for the 3UG4825 IO-Link variant

The residual current monitoring relays for IO-Link offer many other performance features in addition to monitoring functions:

• Measured value transmission (including resolution and unit) to the higher-level control.
• Transmission of alarm flags to the higher-level control
• Comprehensive diagnostics capability by querying the precise cause of the error in the diagnostic data record
• Remote parameterization additionally possible (supplementing local parameterization or instead of local parameterization)
• Fast parameterization of identical devices by duplicating the parameter assignment in the higher-level control
• Parameter transfer by uploading to the higher-level control via an IO-Link call or by parameter server
• Blocking of local parameterization via IO-Link possible
• To prevent automatic startup after a power failure and to avoid losing diagnostic data, errors can be configured so that they are saved to non-volatile memory
• Linking to a higher-level control makes it possible to assign parameters to the monitoring relays via a display unit. The measured values can be displayed directly in a control room or at the machine/control cabinet.