SACO 64 D4 Annunciator Unit Product Guide

This document describes the SACO 64 D4, a self-contained microprocessor-based annunciator unit with 64 alarm channels, used for supervising alarm and signalling contacts in power plants, substations, and industrial processes. It highlights features such as field programmability, 16 output relays, serial interface communication, and high immunity to interference, along with its role in the SPACOM product family and ABB’s Distribution Automation system.