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Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or add-on power controls the job is made easy. External indicator lights provide instant diagnostic feedback making a snap of service calls or new installation start-ups. All switching relays are UL listed and are compatible with conventional and programmable thermostats. For those larger jobs the -EXP Switching Relays can be expanded up to 120 zones 20 zoning panels with priority. Taco Switching Relays are available in one two three four and six zones.