but the control side (coil) must be energized by a 24V AC circuit

including the legacy Robertshaw 802 series

The Watts 0881428 is a professional-grade GB-D 1

also identified as the L-090/095SOX

Functional Devices RIBL3C Relay Els PW 17895 but the control side (coil)The Functional Devices RIBL3C is a professional grade, enclosed pilot relay designed for demanding Building Automation Systems (BAS) and HVACR applications. This "Relay in a Box" unit features a 3SPST NO (Triple Normally Open) contact configuration, allowing for the simultaneous control of three separate circuits from a single control signal. Built for versatile integration, the 10 30VAC DC coil is compatible with most low voltage controllers, while