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$185

Taco SR503-4 3-Zone Switching Relay w/ Priority - New

Posted 24 days ago in North Cambridge, MA

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Ned

Joined Oct 2026

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Description

New, never-installed Taco SR503-4 3-zone switching relay with priority for hydronic heating systems. Purchased for a project but never used. The box has been opened, but the relay has never been installed or wired. * 3 zones with Zone 3 priority * 120 VAC * 15A maximum total load * Isolated end switch * Original box and packaging * Original instruction sheet * Includes thermostat resistor shown in photos The relay, terminals, mounting holes and knockouts are all in unused condition. The original box has some wear from storage.

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New

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