REU610 is a voltage protection relay for system voltage protection,
measuring and supervising in utility and industrial power systems.
REU610 is a member of ABB’s Relion® protection and control product family and part of its 610 product series.
The 610 series includes protection relays for feeder protection, motor protection and general system voltage supervision.
The plug-in design of the 610 series protection relays facilitates the commissioning of the switchgear and
enables fast and safe insertion and withdrawal of relay plug-in units.
The protection relay is primarily designed for the overvoltage protection of power system components, such as busbars,
feeders, power transformers and capacitor batteries.

The functions of REM 54_ machine terminal are categorized as:
• protection functions
• measurement functions
• control functions
• condition monitoring functions
• communication functions
• general functions
• standard functions
The functions are further divided to two subsets that correspond to different functionality levels.

Relay Retrofit Program for REX 521 Product Guide 1MRS758962
Relay Retrofit Program for REX 521 Installation Manual 1MRS758961
Relay Retrofit Program for REX 521 Application Manual 1MRS758960
Relay Retrofit Program for REX 521 Cutting Tool Safety Guide 1MRS758975
Relay Retrofit Program for REX 521 Cutting Tool Operating Guide 1MRS758976
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