This Rheem Sequencing Relay is a Double Pole Single Throw Normally Open (DPST NO) type, designed to operate at 24 volts alternating current (24vac). The relay's primary function is to control the sequence of an electrical circuit's operations. It has two poles, meaning it can control two separate circuits, and it is normally open, which means the relay does not allow current to flow until it receives a specific signal. The Rheem Sequencing Relay is designed for durability and reliability, ensuring consistent performance in controlling electrical circuits.