Taco SR504 Switching Relay

The Taco SR504 Switching Relay is a compact, reliable 4-zone switching relay designed for boiler, circulator, and hydronic system control. With electronic actuation and a DPDT switch, it delivers precise, dependable zone management. This fully enclosed unit measures 12-1/4" W x 3" D x 8" H and is rated for 120V AC at 60 Hz with a 1/3 HP input, plus current ratings of 20A combined, 6A full load, and 36A locked rotor.

Key features and compatibility:

• 4-zone switching relay with electronic actuation for boilers, circulators, and hydronic systems.
• DPDT switch with an external indicator light and switchable priority for flexible control.
• Simplified wiring through a fully enclosed snap-out relay, compact design, and fuse protection.
• 24V AC control with a 1 A isolated end switch and 24V power input/output terminals, plus universal thermostat compatibility.
• Rugged, compliant enclosure UL/CSA listed and housed in a NEMA 1 enclosure for dependable, contractor-friendly operation.