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SPAF 340 C Frequency Relay Product Guide

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This document is a product guide for the ABB SPAF 340 C frequency relay, detailing its overfrequency and underfrequency protection capabilities with four frequency stages. It describes features such as definite time and rate-of-change (df/dt) operating principles, adjustable undervoltage blocking, serial communication for remote control, and self-supervision for high system reliability.

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