This is a BRAND NEW-In-The-BOX White Rodgers relay with a 24 volt coil. It has two completely independant circuits with a "Normally Open" set of contacts and a "Normally Closed" set of contacts. The bottom two prongs are the 24 volt coil, the top 2 prongs are for the Normally Open circuit, the the middle two are for the Normally Closed Circuit. They are rated "Heavy Duty" and can handle 10+ Amps. Thanks for looking and good luck!