Taco SR503 Switching RelayThe Taco SR503 Switching Relay is a compact, three zone switching relay designed for boiler, circulator, and hydronic systems. With electronic actuation and a DPDT switch, it delivers reliable control across three zones while fitting in tight mechanical spaces. This fully enclosed snap out relay features a NEMA 1 enclosure for safe installation and is UL and CSA listed. It operates from 120V AC, 60 Hz, 1 phase, with a 1 3 HP input and supports up to

encapsulated pressure switch designed for direct-mount installations in HVAC

so your heater runs comfortably and reliably

The compact plug-in design simplifies installation

pilot-bleed device is built for reliability and longevity

easy field installation

making it suitable for global applications

Rated up to 50 PSI steam

shielded design with EMI resistance

and central distribution in homes

The ICM206B Time Delay Relay from ICM Controls delivers reliable delay-on-make timing for AC-operated control circuits

Type: Resettable thermal switch for natural gas water heaters

delivers seamless integration for your smart home setup