Enclosed Fan Switching Relay , 24V, 4 Terminal, 50/60 HZ, SPST-NO with multi-positional mounting bracket. White Rodgers/RBM Type 84 relay. This relay has a contact voltage of 125/250/277VAC, coil voltage is 24VAC and the control style is SPST-NO. The amp FLA is 14A@ 125V - 8A @ 250/277V  and the amp RES is 25A @ 250/277V. Same as the ones you buy in the HVAC store and identical or better quality. Sell for about 7.00 to 9.00 plus tax retail. U.L. Rated and made by Supco Corp. See more specifics below. http://www.emersonclimate.com/Documents/White-Rodgers/Catalog_2010/2010_Cat_pg_098.pdf   - Part No.#90290

Used for Switching Single or Two Speed Fan Motors, Solenoids, Relays, Resistive Loads and General Purpose Switching.     Part No. # SE90-290

Please note: Picture shows Smart Electric brand but listing is for Supco brand relay.