ABB CT-ARS.21S Single-Function Electronic Time Relay, Advanced Industrial Control Module
The ABB CT-ARS.21S is an advanced relay protection and control unit designed for medium-voltage applications. Key specs include a response time of <20ms, up to 21 configurable inputs/outputs, and support for IEC 61850 communication protocols. It is typically used in power distribution systems, substations, and industrial plants for protection and automation tasks. Compared to the ABB SPAU130C-AA, the CT-ARS.21S offers more I/O flexibility and faster response times, making it suitable for more demanding applications.
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