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SPAF 140 C Frequency Relay Product Guide

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This document is a product guide for the ABB SPAF 140 C frequency relay, detailing its features for overfrequency and underfrequency protection with four configurable stages. It supports definite time and rate-of-change (df/dt) operating principles, undervoltage blocking, external control inputs, serial communication, and self-supervision for high system reliability.

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